Chula Vista, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Chula Vista weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Foggy——68°57°—
- FridayJun 5Foggy——70°58°+2°
- SaturdayJun 6Foggy——72°57°+2°
- SundayJun 7Overcast——71°61°-1°
- MondayJun 8Mostly Clear——71°61°0°
- TuesdayJun 9Overcast——72°62°+1°
- WednesdayJun 10Overcast——70°60°-2°
PM2.5/PM10 ratio 0.64 with 9 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 48 now. With UV 9.9 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 45 by mid-afternoon.
- Present
- AQI 48
- UV peak
- 9.9 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 45
PM × Wind × Precip
PM2.5/PM10 ratio 0.64 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.64
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:57 AM
- Moonset
- 4:15 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Chula Vista at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: March 3 (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 4, 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 Chula Vista's peak heat with a mean temperature around 74°F, while December delivers the year's coldest conditions at roughly 56°F. Rain follows a Mediterranean pattern, reaching its maximum in February at 2.6 inches and dropping to 0.0 inches during August.
| 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
Part of the broader hot-summer Mediterranean climate region, Chula Vista shares temperature ranges, seasonal patterns, and growing conditions with other nearby cities in this climatic zone.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
Late May brings the peak blooming period for California poppies across the coastal hills.
Anna's hummingbirds begin their second nesting cycle around early June, taking advantage of the extended flowering season.
Frequently asked
- When does it freeze in Chula Vista?
- Spring's final frost usually occurs around mid-March in Chula Vista, while the first fall frost returns around mid-December.
- What is the rainy season in Chula Vista?
- February typically delivers the most rain with about 2.6 inches on average, contributing to the city's annual total of roughly 11 inches.
- What is the warmest month in Chula Vista?
- August generally records the highest temperatures, with averages around 74°F.
- What is the coldest month in Chula Vista?
- December usually brings the coldest weather, averaging about 56°F.
- When can I start a vegetable garden in Chula Vista?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-March, while warm-season varieties such as tomatoes and peppers should wait 1–2 weeks after that date.
- How many rainy days does Chula Vista get?
- Chula Vista typically sees about 20 rainy days per year.
- What hardiness zone is Chula Vista?
- The city's USDA hardiness zone depends on average minimum winter temperatures; use the USDA's online lookup tool with Chula Vista's ZIP code for the current zone designation.
Climate
Chula Vista, California experiences a hot-summer Mediterranean climate zone. Temperatures hover near 57°F in January and average 72°F in July, creating a 15°F seasonal swing.
Annual precipitation totals about 11 inches, falling across roughly 20 rainy days throughout the year.
Geography shapes the local weather patterns through three key factors: latitude at 32.6°N, proximity to large water bodies, and elevation. These elements determine what grows in the area, when frost occurs, and daily weather conditions.