San Diego Weather
Weather in San Diego, California: current conditions, forecast, warnings, monthly averages and seasonal guide
Hourly forecast
7-day forecast for San Diego
| Day | Conditions | Rain | Temp | Summary | |
|---|---|---|---|---|---|
| Today28 Apr | Overcast | 0% | 21°C12°C | Overcast with a high of 21°C and low of 12°C. No rain expected. UV index 7.6 (high). | |
| Wed29 Apr | Overcast | 3% | 20°C12°C | Overcast with a high of 20°C and low of 12°C. 3% chance of rain. UV index 8.2 (very high). | |
| Thu30 Apr | Overcast | 6% | 19°C15°C | Overcast with a high of 19°C and low of 15°C. 6% chance of rain. UV index 7.5 (high). | |
| Fri1 May | Overcast | 3% | 20°C17°C | Overcast with a high of 20°C and low of 17°C. 3% chance of rain. UV index 8.3 (very high). | |
| Sat2 May | Overcast | 0% | 21°C16°C | Overcast with a high of 21°C and low of 16°C. No rain expected. UV index 7.6 (high). | |
| Sun3 May | Overcast | 2% | 20°C16°C | Overcast with a high of 20°C and low of 16°C. 2% chance of rain. UV index 7.6 (high). | |
| Mon4 May | Overcast | 8% | 19°C16°C | Overcast with a high of 19°C and low of 16°C. 8% chance of rain. UV index 7.8 (high). |
Extended outlook — days 8 to 14
Extended forecasts beyond 7 days are less reliable and should be used as a general guide only.
| Day | Conditions | Rain | Temp | Summary | |
|---|---|---|---|---|---|
| Tue5 May | Overcast | 14% | 19°C15°C | Overcast with a high of 19°C and low of 15°C. 14% chance of rain. UV index 8 (very high). | |
| Wed6 May | Mainly clear | 8% | 19°C16°C | Mainly clear with a high of 19°C and low of 16°C. 8% chance of rain. UV index 8.1 (very high). | |
| Thu7 May | Partly cloudy | 2% | 20°C16°C | Partly cloudy with a high of 20°C and low of 16°C. 2% chance of rain. UV index 8.1 (very high). | |
| Fri8 May | Overcast | 3% | 19°C16°C | Overcast with a high of 19°C and low of 16°C. 3% chance of rain. UV index 7.2 (high). | |
| Sat9 May | Overcast | 3% | 18°C16°C | Overcast with a high of 18°C and low of 16°C. 3% chance of rain. UV index 5.1 (moderate). | |
| Sun10 May | Overcast | 6% | 19°C16°C | Overcast with a high of 19°C and low of 16°C. 6% chance of rain. UV index 7.8 (high). | |
| Mon11 May | Mainly clear | 3% | 23°C17°C | Mainly clear with a high of 23°C and low of 17°C. 3% chance of rain. UV index 8.3 (very high). |
Sun & Moon — San Diego
UV Index — San Diego
Protection required. Seek shade during midday, wear sunscreen and a hat.
Air Quality — San Diego
Air quality is excellent. Enjoy outdoor activities freely.
Air quality data from Open-Meteo
Climate overview
San Diego is characterized by a unique semi-arid climate (BSh) that closely borders on a Mediterranean climate (Csa) due to its dry summers and mild, wet winters. This classification reflects a climate greatly influenced by its coastal proximity, specific latitude, and the prevailing atmospheric patterns of the eastern Pacific Ocean. Its position at approximately 32.7 degrees North latitude places it within the subtropical high-pressure belt, which largely dictates its stable, sunny weather, especially during the warmer months. This results in far less seasonal temperature variation than inland areas, providing a consistently comfortable environment year-round.
Key geographic features profoundly shape San Diego's climate. The city is situated on the coast of Southern California, benefiting directly from the moderating influence of the Pacific Ocean. The cold California Current, flowing southwards along the coast, plays a crucial role in keeping coastal temperatures relatively cool, even in summer, and contributes to the frequent morning low clouds and fog, often referred to as
San Diego receives approximately 250mm to 300mm (10 to 12 inches) of rainfall annually, with the wettest months from December to March, with February typically receiving the most rainfall. San Diego basks in abundant sunshine, averaging around 3,000 hours annually. This translates to about 8-10 hours of sunshine per day in summer, gradually decreasing to 6-7 hours in autumn and spring, and 5-6 hours during the winter months. This high number of clear days significantly exceeds the national average for major U.S. cities, contributing to San Diego's reputation for pleasant weather. However, this also implies a consistently high UV index, particularly from spring through early autumn, necessitating year-round sun protection for outdoor activities.
San Diego's diverse topography creates distinct microclimates across the region. Coastal areas experience significant moderation from the Pacific Ocean, resulting in cooler summers and warmer winters compared to inland valleys. The prominent 'marine layer,' a low cloud deck and fog, frequently affects coastal areas in late spring and early summer, often burning off to clear skies by midday, a phenomenon locally known as 'May Gray' or 'June Gloom.'
Moving eastward, away from the immediate coast, the marine influence diminishes, leading to greater temperature extremes and less humidity. Inland valleys and foothills can be significantly hotter in summer and cooler in winter, sometimes experiencing frost. The urban core of San Diego can exhibit a slight urban heat island effect, retaining warmth more than surrounding natural areas. Significant elevation changes towards the eastern mountains can also lead to cooler temperatures and occasional snow at higher altitudes, though this is far from the city center.
Monthly averages for San Diego
Climate data sourced from National Weather Service (NWS) climate data for San Diego. Summer temperatures range from 19°C to 26°C (66°F to 79°F), though inland areas can reach 30°C+, while winter sits between 8°C to 18°C (46°F to 64°F).
| Month | Avg High | Avg Low | Rain (mm) | Rain Days |
|---|---|---|---|---|
| January | 18°C | 8°C | 60.5 | 7 |
| February | 18.2°C | 9°C | 66.8 | 7 |
| March | 18.3°C | 10°C | 43.4 | 6 |
| April | 19.4°C | 11°C | 17.5 | 4 |
| May | 20°C | 13°C | 5.1 | 2 |
| June | 21.7°C | 15°C | 2.5 | 1 |
| July | 23.9°C | 17°C | 0.8 | 1 |
| August | 25°C | 18°C | 2.5 | 1 |
| September | 24.8°C | 17°C | 7.6 | 2 |
| October | 22.8°C | 14°C | 20.3 | 3 |
| November | 20°C | 10°C | 33 | 4 |
| December | 17.8°C | 8°C | 46.5 | 6 |
Water temperature
The Pacific Ocean water temperatures off San Diego vary seasonally, influencing swimming and water sports. During the summer months, water temperatures typically range between 20-22°C, making it comfortable for swimming, surfing, and paddleboarding without a wetsuit for many. The warmest waters are usually found from late August through September.
In the winter, temperatures cool considerably to between 14-16°C. While some hardy individuals still swim, most opt for wetsuits for extended periods in the water for activities like surfing or snorkeling. Estuary waters in bays and lagoons can be slightly warmer or colder than the open ocean depending on tidal flow and freshwater input. Popular swimming spots include Coronado Beach, La Jolla Shores, and Pacific Beach.
Summer water temperatures around San Diego range from 20-22°C, cooling to 14-16°C in winter.
Things to do this summer in San Diego
Summer in San Diego calls for light, breathable clothing like shorts, t-shirts, and sundresses. Evenings can be cool near the coast, so a light jacket or cardigan is advisable. Sunscreen, a wide-brimmed hat, and sunglasses are essential due to high UV levels. Stay hydrated, especially if engaging in outdoor activities. While generally pleasant, be mindful of potential heatwaves, particularly inland, and limit strenuous activity during peak heat. Traffic to coastal areas can be heavy, so plan accordingly.
- Explore Balboa Park museums and gardens
- Enjoy a beach day at Coronado Beach
- Go whale watching for blue whales (June-September)
- Visit the San Diego Zoo
- Attend a Padres baseball game at Petco Park
- Paddleboard or kayak in La Jolla Cove
- Experience the Old Globe Theatre's summer season
Best time to visit San Diego
The absolute best time to visit San Diego is during the spring (April to May) and autumn (September to October) shoulder seasons. During these months, the weather is exceptionally pleasant with warm temperatures and minimal
Weather radar — San Diego
Weather warnings & safety
While generally mild, San Diego is susceptible to several forms of severe weather. Thunderstorms are infrequent but can occur, particularly during late summer and early autumn due to monsoonal moisture, potentially bringing heavy rain and localized flooding. Flash flooding is a risk in canyon areas and low-lying urban spaces, especially after prolonged or intense rainfall events. Heatwaves, characterized by dangerously high temperatures often exacerbated by Santa Ana winds, primarily occur in late summer and early autumn, increasing the risk of heat-related illnesses and exacerbating wildfire conditions.
Wildfires and bushfires are a significant concern, especially during the dry season and when Santa Ana winds are present, rapidly spreading fires through dry vegetation. Although rare, tropical storms or their remnants can occasionally bring increased humidity, rain, and surf to the region, typically in late summer or early autumn. Frost can occur in inland valleys during winter. Drought is a recurring, long-term concern for Southern California, impacting water resources.
Weather near San Diego
Frequently asked questions about San Diego weather
What is the weather in San Diego right now?
Right now in San Diego it is 18°C and clear sky. Today's high is 21°C with a low of 12°C. Humidity is at 58%. Wind is NW at 8 km/h.
What is the 14-day forecast for San Diego?
Today (28 Apr): Overcast with a high of 21°C and low of 12°C. No rain expected. UV index 7.6 (high). Wed (29 Apr): Overcast with a high of 20°C and low of 12°C. 3% chance of rain. UV index 8.2 (very high). Thu (30 Apr): Overcast with a high of 19°C and low of 15°C. 6% chance of rain. UV index 7.5 (high). Fri (1 May): Overcast with a high of 20°C and low of 17°C. 3% chance of rain. UV index 8.3 (very high). Sat (2 May): Overcast with a high of 21°C and low of 16°C. No rain expected. UV index 7.6 (high). Sun (3 May): Overcast with a high of 20°C and low of 16°C. 2% chance of rain. UV index 7.6 (high). Mon (4 May): Overcast with a high of 19°C and low of 16°C. 8% chance of rain. UV index 7.8 (high). Tue (5 May): Overcast with a high of 19°C and low of 15°C. 14% chance of rain. UV index 8 (very high). Wed (6 May): Mainly clear with a high of 19°C and low of 16°C. 8% chance of rain. UV index 8.1 (very high). Thu (7 May): Partly cloudy with a high of 20°C and low of 16°C. 2% chance of rain. UV index 8.1 (very high). Fri (8 May): Overcast with a high of 19°C and low of 16°C. 3% chance of rain. UV index 7.2 (high). Sat (9 May): Overcast with a high of 18°C and low of 16°C. 3% chance of rain. UV index 5.1 (moderate). Sun (10 May): Overcast with a high of 19°C and low of 16°C. 6% chance of rain. UV index 7.8 (high). Mon (11 May): Mainly clear with a high of 23°C and low of 17°C. 3% chance of rain. UV index 8.3 (very high).
What is the air quality in San Diego today?
The current air quality index in San Diego is 20 (European AQI), rated "Good". Air quality is excellent. Enjoy outdoor activities freely. PM2.5 is 8.9 µg/m³. PM10 is 12.3 µg/m³.
What is the average annual rainfall in San Diego?
San Diego receives an average annual rainfall of approximately 250mm to 300mm (10 to 12 inches). Most of this precipitation occurs during the cooler months, primarily from December through March. The city's semi-arid climate means that many months, especially during summer, receive very little to no rainfall, contributing to its consistently sunny reputation.
What is the water temperature in San Diego?
Ocean water temperatures off San Diego typically range from 14-16°C in winter to 20-22°C in summer. These temperatures are generally comfortable for swimming without a wetsuit during the peak summer months, especially in late August and September. For activities like surfing or extended snorkeling in cooler months, a wetsuit is often preferred.
What time is sunset in San Diego?
Sunset times in San Diego vary significantly throughout the year. In mid-summer (June/July), sunset can be as late as 8:00 PM PDT, offering long evenings. During the winter months (December/January), sunset occurs much earlier, typically around 4:45 PM PST. For today's precise sunset time, please check the dedicated sunrise-sunset page on our weather hub.
What is the wind like in San Diego?
San Diego generally experiences mild winds, predominantly from the west or northwest, bringing cool ocean air. Sea breezes are a regular feature, developing in the afternoon and moderating coastal temperatures. Occasionally, the region experiences Santa Ana winds, strong, dry, hot winds from the east that bring warmer temperatures and elevate wildfire risk. For current and hourly wind conditions, refer to our dedicated wind page.
Why is San Diego air quality bad today?
San Diego's air quality can occasionally decline due to several factors. These often include vehicle emissions, industrial activity, and sometimes elevated ozone levels during hot, sunny conditions. Wildfires, even those distant, can also cause significant particulate matter and smoke to drift into the region, particularly with certain wind patterns. For the most up-to-date Air Quality Index (AQI) and pollutant levels, visit our air quality page.
What is the UV index in San Diego and how should I protect myself?
San Diego typically experiences moderate to high UV index values year-round, peaking in the summer months. Even on overcast days, UV radiation can be significant. It is recommended to use broad-spectrum sunscreen with an SPF of 30 or higher, wear protective clothing, including a wide-brimmed hat and sunglasses, and seek shade during peak UV hours (typically 10 AM to 4 PM). Our dedicated UV page provides the hourly and 7-day UV forecast.
How much rain does San Diego get in December?
December is one of San Diego's wetter months, receiving an average of approximately 46.5 mm (1.8 inches) of rainfall over about 6 rainy days. While this is modest compared to many other regions, it accounts for a significant portion of the city's annual precipitation. Rain showers are typically intermittent, interspersed with clear, mild days.
What is the weather like in San Diego in January?
January in San Diego is characterized by mild, pleasant winter weather. Average high temperatures are around 18.0°C, with lows around 8.0°C. It is one of the cooler and wetter months, averaging about 60.5 mm of rain over 7 rain days. Despite the rain, sunny days are still common, making it suitable for outdoor activities with appropriate layering.
What is the typical moon phase in San Diego?
The moon phases in San Diego follow the global lunar cycle, progressing from New Moon to First Quarter, Full Moon, and Last Quarter approximately every 29.5 days. The visibility of each phase depends on the time of day and sky conditions. Our dedicated sunrise-sunset page provides the current moon phase and illumination percentage, along with a 14-day moon phase table.
What should I wear for a sunset cruise in San Diego?
For a sunset cruise in San Diego, it's advisable to dress in layers, even on a warm day. While daytime temperatures can be pleasant, it cools down significantly on the water after sunset. A light jacket or sweater is usually sufficient in summer, but a warmer coat might be preferred in cooler months. Comfortable closed-toe shoes are also a good idea.
Where can I find an hourly weather forecast for San Diego?
For a detailed hour-by-hour weather forecast for San Diego, including temperature, precipitation chances, wind speed, and humidity, please visit our dedicated hourly forecast page. This page provides a 48-hour breakdown to help you plan your day with precision.
What are the driving conditions like in San Diego during wet weather?
During wet weather, driving conditions in San Diego can become challenging. Roads can be slick, particularly after the first rains of the season when oil and grime accumulate. Visibility may be reduced due to rain and occasional fog. It's crucial to slow down, increase following distance, and ensure your vehicle's tires and wipers are in good condition. Flash flooding can occur in low-lying areas or underpasses during heavy downpours.
Is it safe to swim in San Diego in November?
Swimming in San Diego in November is generally safe, but the ocean water temperature will be cooler, typically ranging from 16-18°C. While many people still swim, a wetsuit may enhance comfort for extended periods in the water. The beaches are less crowded than in summer, offering a more tranquil experience. Always be aware of surf conditions and potential rip currents.