Chula Vista, California Weather
Ceanothus blooms again. Day 93 of summer. Read this microseason across nine climate regions →
Chula Vista weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:00 AM PDT · Open-Meteo
- TodaySep 21Overcast——74°66°—
- TuesdaySep 22Overcast——76°61°+2°
- WednesdaySep 23Clear——77°68°+1°
- ThursdaySep 24Clear——78°69°+1°
- FridaySep 25Clear——84°70°+6°
- SaturdaySep 26Overcast——86°73°+2°
- SundaySep 27Light Drizzle——86°75°0°
Air quality now AQI 59 · Moderate
AQI 59 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 15.8 µg/m³ (AQI 63) with a 0.77 fine-to-coarse ratio and 1 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 15.8 µg/m³ (AQI 63) with a 0.77 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.77
- 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 →
Chula Vista at a glance
- Today vs. normal: Today averages 70°F (high 74°F, low 66°F), 2°F below the 72°F normal for Sep 21
- Last frost: None in most years — 32°F in 7% of 1991–2020 years (NOAA station 7 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
15-Day Forecast — Chula Vista
- Mon74°66°2%
- Tue76°61°2%
- Wed77°68°0%
- Thu78°69°2%
- Fri84°70°0%
- Sat86°73°1%
- Sun86°75°5%
- Mon89°75°11%
- Tue85°79°11%
- Wed86°71°10%
- Thu75°69°4%
- Fri84°70°13%
- Sat86°74°16%
- Sun91°76°9%
- Mon84°77°6%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Chula Vista
Interactive wind and temperature map centered on Chula Vista — 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 Chula Vista
Chula Vista sits in San Diego County, where the year’s longest day runs 14h 18m of daylight and its shortest just 10h 0m — a swing of +4h 18m 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 130 miles to the NW. The nearest town Chula Vista tracks is San Diego, roughly 15 miles to the NNW.
Air quality in Chula Vista
Air quality in Chula Vista’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 Chula Vista.
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
Chula Vista's warmest month is August (~74°F mean) and its coldest is January (~55°F). Rainfall peaks in February (2.1 inches) and bottoms out in July (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 Bonita, CA, National City, CA, La Presa, CA
Chula Vista 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 Chula Vista runs about 11 inches.
Cool-season fronts carry Chula Vista's rain: February logs 2.1 inches, against July's 0.1 inches — winter does the heavy lifting in Chula Vista. That cool-season-wet pattern aligns Chula Vista with places like Bonita, CA, National City, CA and La Presa, CA.
Hard freezes are rare in Chula Vista: the coldest month averages 55°F, so Chula Vista's growing window runs most of the year. August is the hottest stretch near 74°F, pushing cool-season crops to the milder shoulder months. Chula Vista's rare cold nights chill open ground first.
Similar climates: Bonita, CA, National City, CA, La Presa, CA, Imperial Beach, CA, Lemon Grove, CA.
Frequently asked
- When does it freeze in Chula Vista?
- Chula Vista freezes in fewer than half of years — 7% of 1991–2020 years at the nearest NOAA station — so Chula Vista has no typical frost date.
- What is the rainy season in Chula Vista?
- February is the wettest month in Chula Vista, about 2.1 inches on average; the year totals roughly 11 inches.
- What is the warmest month in Chula Vista?
- August is Chula Vista's warmest month, averaging about 74°F.
- What is the coldest month in Chula Vista?
- Chula Vista bottoms out in January, with a mean near 55°F.
- When can I start a vegetable garden in Chula Vista?
- Start whenever suits in Chula Vista — freezes are too rare for a frost date — and save lettuce and peas for Chula Vista's coolest stretch, near 55°F.
- What hardiness zone is Chula Vista?
- Chula Vista'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 Chula Vista?
- Chula Vista'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 Chula Vista?
- See this week's day-by-day rain chances for Chula Vista in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Chula Vista?
- Current conditions for Chula Vista and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Chula Vista forecast updated?
- The Chula Vista forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Chula Vista?
- Today's sunrise and sunset times for Chula Vista 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 Chula Vista?
- The next few days in Chula Vista's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Chula Vista sits at 32.6°N; its climate zone is hot-summer Mediterranean (Köppen approximation).
ZIP codes in Chula Vista
- 91902
- 91908
- 91909
- 91910
- 91911
- 91912
- 91913
- 91914
- 91915
- 91921