San Diego, California Weather
Ceanothus blooms again. Day 93 of summer. Read this microseason across nine climate regions →
San Diego weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 7:01 AM PDT · Open-Meteo
- TodaySep 21Overcast——75°67°—
- TuesdaySep 22Overcast——77°63°+2°
- WednesdaySep 23Overcast——83°62°+6°
- ThursdaySep 24Light Drizzle——83°70°0°
- FridaySep 25Clear——87°72°+4°
- SaturdaySep 26Partly Cloudy——89°74°+2°
- SundaySep 27Overcast——87°75°-2°
Air quality now AQI 58 · Moderate
AQI 58 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 18.5 µg/m³ (AQI 69) with a 0.85 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 18.5 µg/m³ (AQI 69) with a 0.85 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.85
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:04 PM
- Moonset
- 1:35 AM
- In sign
- ♑︎ Capricorn
Ceanothus blooms again
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
San Diego at a glance
- Today vs. normal: Today averages 71°F (high 75°F, low 67°F), about the 72°F normal for Sep 21
- Last frost: None in most years — 32°F in 6% of 1991–2020 years (NOAA station 2 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant lettuce, peas, spinach, radishes, beans, squash; harvest lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — San Diego
- Mon76°67°3%
- Tue76°64°1%
- Wed83°68°0%
- Thu83°70°3%
- Fri87°72°2%
- Sat89°74°1%
- Sun87°75°3%
- Mon90°71°9%
- Tue94°76°12%
- Wed97°82°12%
- Thu101°85°7%
- Fri98°87°13%
- Sat98°84°13%
- Sun97°81°12%
- Mon96°85°6%
- Tue96°80°10%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near San Diego
Interactive wind and temperature map centered on San Diego — it loads in your browser. Open the full weather map.
Right now in the garden
Year-round growing
As of September 21, sowing here runs through the year. Freezes are uncommon, so there is no frost date to plan around; heat and rainfall set the calendar instead. This city's planting calendar for September: plant lettuce, peas, spinach, radishes, beans, and squash; harvest lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in San Diego
San Diego sits in San Diego County, where the year’s longest day runs 14h 19m of daylight and its shortest just 9h 59m — a swing of +4h 20m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Los Angeles, the state’s largest city, lies about 115 miles to the NW. The nearest town San Diego tracks is Chula Vista, roughly 15 miles to the SSE.
Air quality in San Diego
Air quality in San Diego’s county has held roughly steady since 2020; its cleanest year on record was 2022 (median AQI 63). See the full air-quality history for San Diego.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
| February | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
| March | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash |
| July | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| August | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| September | lettuce, peas, spinach, radishes, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| October | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| November | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| December | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
A year in weather
In San Diego, August runs warmest near 74°F and January coldest around 55°F, while February is the wettest month (2.1 inches) and July the driest (0.1 inches).
| Month | Mean temp | Precip |
|---|---|---|
| January | 55° | 2.0″ |
| February | 56° | 2.1″ |
| March | 58° | 1.9″ |
| April | 61° | 1.0″ |
| May | 64° | 0.3″ |
| June | 68° | 0.1″ |
| July | 73° | 0.1″ |
| August | 74° | 0.1″ |
| September | 73° | 0.1″ |
| October | 68° | 0.3″ |
| November | 61° | 1.0″ |
| December | 55° | 2.0″ |
Regional context
Similar climates La Mesa, CA, Santee, CA, Lemon Grove, CA
San Diego swings from 55°F in January to 73°F in July (18°F) per modelled 1991-2020 normals (EC_Earth3P_HR model via Open-Meteo); precipitation in San Diego runs about 11 inches.
San Diego's moisture rides winter storm tracks: February brings 2.1 inches, while July sees only 0.1 inches in the dry warm season. That groups San Diego with places like La Mesa, CA, Santee, CA and Lemon Grove, CA on the same cool-season storm track.
With a coldest-month mean of 55°F, San Diego stays mostly frost-free and grows year-round. The August peak near 74°F is San Diego's real limit, pushing cool-season vegetables to spring and fall. San Diego's open lawns chill fastest on clear nights.
Similar climates: La Mesa, CA, Santee, CA, Lemon Grove, CA, El Cajon, CA, Casa de Oro-Mount Helix, CA.
Frequently asked
- When does it freeze in San Diego?
- Most years San Diego doesn't freeze: the nearest NOAA station reached 32°F in 6% of 1991–2020 years, so San Diego has no reliable frost date.
- What is the rainy season in San Diego?
- Rainfall in San Diego peaks in February near 2.1 inches, out of about 11 inches annually.
- What is the warmest month in San Diego?
- The warmest stretch in San Diego comes in August, around 74°F on average.
- What is the coldest month in San Diego?
- On average January is the chilliest month in San Diego, about 55°F.
- When can I start a vegetable garden in San Diego?
- Any season works in San Diego: without a reliable freeze, San Diego's heat, not frost, decides when greens and tomatoes do best.
- What hardiness zone is San Diego?
- San Diego's hardiness zone tracks its winter low; with January near 55°F, check the USDA ZIP map for the exact zone.
- What is the 10-day forecast for San Diego?
- San Diego's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in San Diego?
- See this week's day-by-day rain chances for San Diego in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in San Diego?
- Current conditions for San Diego and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the San Diego forecast updated?
- The San Diego forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in San Diego?
- Today's sunrise and sunset times for San Diego are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for San Diego?
- The next few days in San Diego's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
San Diego sits at 32.8°N; its climate zone is hot-summer Mediterranean (Köppen approximation).
ZIP codes in San Diego
- 92014
- 92025
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- 92037
- 92038
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