Weather StoryAlmanac, microseasons, and the day's weather story.

Chula Vista, California Weather

August begins in scorching stillness. Day 43 of summer. Read this microseason across nine climate regions →

Chula Vista weather forecast — hour by hour, 7-day outlook, NOAA radar

Chula Vista, CA
Sunday, August 2 at 7:59 AM
69
°
Partly Cloudy
Feels like
74°
Humidity
92%
Wind
2 mph
Sunrise
11:03 PM
Sunset
12:45 PM
Chula Vista, CA
Hour by hour · 24h
24-Hour ForecastChula Vista, CA: 24-hour forecast. Temperatures range from 66 to 78 degrees Fahrenheit.
L 66°H 78°
Chula Vista, CA
7-day forecast
  1. Today
    Aug 2
    Foggy
    —
    —
    78°67°—
  2. Monday
    Aug 3
    Foggy
    —
    —
    78°66°0°
  3. Tuesday
    Aug 4
    Foggy
    —
    —
    82°64°+4°
  4. Wednesday
    Aug 5
    Overcast
    —
    —
    83°71°+1°
  5. Thursday
    Aug 6
    Partly Cloudy
    —
    —
    81°71°-2°
  6. Friday
    Aug 7
    Mostly Clear
    —
    —
    81°70°0°
  7. Saturday
    Aug 8
    Clear
    —
    —
    84°71°+3°
Chula Vista, CA
Next 24 hours · Mild now
62°72°82°12p6p12a6anow 67°high 78°low 66°
Chula Vista, CA
Anemometer · 24h winds · from true
NESW
From · True
NW
324° · backing 18°
Direction
NW
324°
Sustained
2
mph
Gust
3
mph
Peak 24h
8
avg 4 mph
Beaufort · 1 · LIGHT AIR
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 4 mph · pk 8 mph @ 12:00p
010MPHB1B2B3B4-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 102SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Chula Vista, CA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
994.7
-0.7 mb in 3h · falling · 29.37 inHg
Now
994.7
mb
3h
-0.7
mb
12h
-1.0
mb
24h
-3.5
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 994–998
9859909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW997.7993.9993.9
Deep low — expect rough seas, strong wind, and persistent rain.
Chula Vista, CA
Air quality
57
AQI
Moderate
→-1 in 6h

AQI 57 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 17.8 µg/m³ (AQI 67) with a 0.85 fine-to-coarse ratio and 2 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.

PM 2.5DRIVERModerate
17.8μg/m³
PM 10Good
21μg/m³
NO₂Moderate
29μg/m³
OzoneGood
16μg/m³
UV IndexLow
0.3

What's driving it

PM × Wind × Precip

PM2.5 at 17.8 µg/m³ (AQI 67) with a 0.85 fine-to-coarse ratio and 2 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).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³300
Chula Vista, CA
Sky cover · visibility · 24h
Cloud cover
64%
PARTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
26.1mi
UNLIMITED
48 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
14:59 UTC · Chula Vista, CA · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
14:59 UTC · Chula Vista, CA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Chula Vista, CA
Satellite · infrared · animated
Chula Vista, CA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Chula Vista, CA
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:37 AM
Sunrise
11:03 PM
Daylight
13h 42m
Sunset
12:45 PM
Civil dusk
8:13 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Chula Vista, CA
The moon
Waning Gibbous
84% illuminated
Moonrise
9:32 PM
Moonset
9:57 AM
In sign
♓︎ Pisces
Chula Vista, CA
Microseason
Aug 1–5

August begins in scorching stillness

plant
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Chula Vista at a glance

  • Today vs. normal: 69°F — typical for the season
  • Last frost: March 3 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 91910, 91911, 91913, 91914, 91915

16-Day Forecast — Chula Vista

  1. Sun78°67°1%
  2. Mon78°66°1%
  3. Tue82°64°0%
  4. Wed83°71°1%
  5. Thu81°71°3%
  6. Fri81°70°2%
  7. Sat84°71°2%
  8. Sun83°71°3%
  9. Mon83°71°1%
  10. Tue81°70°1%
  11. Wed80°70°2%
  12. Thu81°70°3%
  13. Fri81°70°13%
  14. Sat83°71°2%
  15. Sun81°72°10%
  16. Mon78°69°6%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near Chula Vista

Right now in the garden

Peak growing season

As of August 2, 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.

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’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.

January 1–5: New year in coastal mist.January 6–10: Hills hold the winter cold.January 11–15: Light lengthens over wet earth.January 16–20: The green pulse quickens.January 21–25: Spring green spreads inland.January 26–31: Winter's grip releases.February 1–5: Fog lifts, flowers open.February 6–10: Blooms erupt across chaparral.February 11–15: Winter blooms at their peak.February 16–20: Rivers recede, flowers spread.February 21–25: Earth warms, flowers rush upslope.February 26–28: Spring advances on cool winds.March 1–5: Grass and trees bud and break.March 6–10: Insects wake and feed.March 11–15: Blossoms crown the hillsides.March 16–20: Monarch chrysalis emergence.March 21–25: Light overtakes dark at equinox.March 26–31: California poppy ablaze.April 1–5: Spring rain feeds the seedlings.April 6–10: Warblers flood the understory.April 11–15: Allen's hummingbirds in courtship dives.April 16–20: Coastal fog settles; sun breaks midday.April 21–25: Oak canopies full and green.April 26–30: Chaparral awakens after spring rains.May 1–5: Coastal wildflowers at their peak.May 6–10: Gray whales complete their migration north.May 11–15: Redwood coast in cool shade.May 16–20: Fog and sun in daily rhythm.May 21–25: Summer approaches; hills turn gold.May 26–31: Dry season begins; tule fog in valleys.June 1–5: Coastal fog thickens at dawn.June 6–10: California poppies fade as heat rises.June 11–15: Summer solstice light stretched thin.June 16–20: Bay laurel fragrance sweetens shade.June 21–25: Longest daylight, driest air.June 26–30: Fog banks mask the turning tide.July 1–5: Summer heat deepens across the valleys.July 6–10: Warm winds drive dryness inland.July 11–15: Pacific high settles in firmly.July 16–20: Young hawks take to the thermals.July 21–25: Peak fire season, peak heat.July 26–31: Chaparral poised for ignition.August 1–5: August begins in scorching stillness.August 6–10: Autumn's first cool breath arrives.August 11–15: Cool winds signal the turning year.August 16–20: Evening cicada chorus.August 21–25: Marine layer descent.August 26–31: Monarch staging begins.September 1–5: Fire season intensity.September 6–10: Dew on drying grasses.September 11–15: Raptor passage begins.September 16–20: Equinox descent.September 21–25: Ceanothus blooms again.September 26–30: Insects retreat below.October 1–5: Creeks begin to whisper.October 6–10: Santa Ana wind season.October 11–15: Wildflower anticipation.October 16–20: Chaparral embers glow.October 21–25: First atmospheric river looms.October 26–31: Rains return at last.November 1–5: Coast live oak leaves turn amber.November 6–10: California lilac blooms in winter light.November 11–15: First rain greens the chaparral.November 16–20: Coastal fog thickens as storms approach.November 21–25: Thanksgiving rains swell the valleys.November 26–30: Autumn's last breath yields to winter.December 1–5: December arrives, storms accelerate.December 6–10: Winter solstice season intensifies.December 11–15: Deep winter: rivers at flood stage.December 16–20: Winter salmon runs peak in northern rivers.December 21–25: Winter solstice: the sun turns.December 26–31: Year's end in wind and rain.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · August 1–5

August begins in scorching stillness

Calm days dominate early August; temperatures peak; the entire ecosystem is in survival mode.

Day 214 of 365 · Wedge 43 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
Marchlettuce, peas, spinach, radishes—
Aprillettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash—
Maytomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
July—tomatoes, beans, summer squash
August—tomatoes, beans, summer squash
September—tomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
Novemberfall brassicas, garlic (overwinter), carrots—
December——

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).

MonthMean tempPrecipRainy days
January55°2.0″10
February56°2.1″10
March58°1.9″12
April61°1.0″10
May64°0.3″10
June68°0.1″8
July73°0.1″3
August74°0.1″4
September73°0.1″5
October68°0.3″6
November61°1.0″7
December55°2.0″9

Regional context

Chula Vista swings from 55°F in January to 73°F in July (18°F) per NOAA NCEI 1991-2020 normals; precipitation in Chula Vista runs about 11 inches on roughly 94 measurable days.

Cool-season fronts carry Chula Vista's rain: February logs 2.1 inches on 9.6 days, against July's 0.1 inches on 3.0 — 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 coastal lots stay 4-7°F milder overnight than Chula Vista's inland parcels.

Similar climates: Bonita, CA, National City, CA, La Presa, CA, Imperial Beach, CA, Lemon Grove, 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?
Frost typically leaves Chula Vista by mid-March and returns to Chula Vista near mid-December.
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?
Chula Vista's last frost (mid-March) cues hardy greens; in Chula Vista, hold heat-lovers two weeks past.
How many rainy days does Chula Vista get?
Chula Vista averages about 94 days with measurable rain or snow each year.
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.

Climate

Chula Vista's hot-summer Mediterranean climate in California pairs 55°F Januarys with 73°F Julys, 18°F apart across the seasons.

Across the year, Chula Vista collects about 11 inches of precipitation over roughly 94 days with measurable rain or snow.

At 32.6°N, Chula Vista's 18°F summer-to-winter swing sets when Chula Vista's gardens wake and when frost returns.

All cities in California →

San Diego, CA weather →

ZIP codes in Chula Vista

  • 91911
  • 91910
  • 91913
  • 91915
  • 91914
  • 91902
  • 91908
  • 91909
  • 91912
  • 91921

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.