San Diego, California Weather
Coastal fog thickens at dawn. Day 76 of spring. Read this microseason across nine climate regions →
San Diego weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——73°60°—
- ThursdayJun 4Foggy——75°58°+2°
- FridayJun 5Foggy——78°56°+3°
- SaturdayJun 6Overcast——76°63°-2°
- SundayJun 7Overcast——74°61°-2°
- MondayJun 8Mostly Clear——77°60°+3°
- TuesdayJun 9Mostly Clear——79°62°+2°
PM2.5/PM10 ratio 0.66 with 7 mph wind — characteristic of long-range haze transport rather than a local source. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 56 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 56
- UV peak
- 3.8 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 56
PM × Wind × Precip
PM2.5/PM10 ratio 0.66 with 7 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.66
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:19 AM
- Moonset
- 3:15 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
San Diego at a glance
- Today vs. normal: 9°F below the seasonal normal for this latitude
- Last frost: March 4 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
August brings San Diego's highest temperatures (~74°F mean) while December delivers the coldest (~56°F). February sees peak rainfall at 2.6 inches, and August receives virtually no precipitation (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 57° | 2.3″ | 3 |
| February | 57° | 2.6″ | 4 |
| March | 59° | 1.6″ | 3 |
| April | 62° | 0.8″ | 2 |
| May | 64° | 0.3″ | 1 |
| June | 67° | 0.1″ | 0 |
| July | 72° | 0.1″ | 0 |
| August | 74° | 0.0″ | 0 |
| September | 73° | 0.2″ | 0 |
| October | 68° | 0.5″ | 1 |
| November | 61° | 0.9″ | 2 |
| December | 56° | 1.6″ | 3 |
Regional context
San Diego belongs to the hot-summer Mediterranean climate region — sharing similar temperature ranges, seasonal patterns, and growing conditions with other cities in this climate group.
Similar climates: Los Angeles, CA, San Francisco, CA, Riverside, CA, Sacramento, CA, San Jose, CA.
Naturalist notes
Late May brings the peak migration of Allen's Hummingbirds through San Diego County's coastal corridors.
Coastal sage scrub blooms reach their second flush in June, when white sage and California buckwheat flower along the hillsides.
Frequently asked
- When does it freeze in San Diego?
- Mid-March typically marks San Diego's last spring frost, while the first fall frost usually arrives around mid-December.
- What is the rainy season in San Diego?
- February receives the most rainfall with about 2.6 inches on average; the city gets roughly 11 inches annually.
- What is the warmest month in San Diego?
- August typically brings the warmest temperatures, averaging about 74°F.
- What is the coldest month in San Diego?
- December usually has the coldest temperatures, averaging about 56°F.
- When can I start a vegetable garden in San Diego?
- Cool-season crops (peas, lettuce) can be planted around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) should wait until 1–2 weeks after.
- How many rainy days does San Diego get?
- San Diego sees about 20 rainy days per year on average.
- What hardiness zone is San Diego?
- San Diego's USDA hardiness zone depends on its lowest average winter temperature; use the USDA's online lookup with the city ZIP for the current zone designation.
Climate
San Diego, California experiences a hot-summer Mediterranean climate zone. January temperatures hover near 57°F while July averages 72°F — a 15°F seasonal swing.
Throughout the year, San Diego receives about 11 inches of precipitation spread over roughly 20 rainy days.
Geography shapes the annual weather patterns through latitude (32.8°N), proximity to large water bodies, and elevation — factors that determine what grows here, when frost occurs, and the daily weather patterns.
ZIP codes in San Diego
- 92182
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