Irvine, California Weather
Ceanothus blooms again. Day 93 of summer. Read this microseason across nine climate regions →
Irvine weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 7:24 AM PDT · Open-Meteo
- TodaySep 21Overcast——78°68°—
- TuesdaySep 22Overcast——79°65°+1°
- WednesdaySep 23Clear——84°62°+5°
- ThursdaySep 24Clear——85°70°+1°
- FridaySep 25Overcast——90°72°+5°
- SaturdaySep 26Overcast——91°75°+1°
- SundaySep 27Mostly Clear——88°74°-3°
Air quality now AQI 46 · Good
AQI 46 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 12.3 µg/m³ (AQI 57) with a 0.77 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 12.3 µg/m³ (AQI 57) with a 0.77 fine-to-coarse ratio and 3 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
- 4:09 PM
- Moonset
- 1:36 AM
- In sign
- ♑︎ Capricorn
Ceanothus blooms again
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Irvine at a glance
- Today vs. normal: Today averages 73°F (high 78°F, low 68°F), 2°F below the 75°F normal for Sep 21
- Last frost: None in most years — 32°F in 4% of 1991–2020 years (NOAA station 7 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash; harvest lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Irvine
- Mon78°68°4%
- Tue79°65°0%
- Wed84°62°0%
- Thu85°70°1%
- Fri90°72°2%
- Sat91°75°1%
- Sun88°74°2%
- Mon93°72°5%
- Tue96°76°4%
- Wed101°82°6%
- Thu103°84°3%
- Fri102°85°6%
- Sat98°83°10%
- Sun97°83°9%
- Mon98°84°3%
- Tue93°81°6%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Irvine
Interactive wind and temperature map centered on Irvine — 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, tomatoes, peppers, beans, and squash; harvest lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Irvine
Irvine sits in Orange County, where the year’s longest day runs 14h 23m of daylight and its shortest just 9h 55m — a swing of +4h 29m 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 47 miles to the NW. The nearest town Irvine tracks is Santa Ana, roughly 7 miles to the WNW.
Air quality in Irvine
Air quality in Irvine’s county has held roughly steady since 2020; its cleanest year on record was 2023 (median AQI 52). See the full air-quality history for Irvine.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | lettuce, peas, spinach, radishes | lettuce, peas, spinach, radishes |
| February | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| March | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| May | lettuce, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| July | lettuce, peas, tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| August | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| September | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| October | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| November | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| December | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
A year in weather
August is Irvine's warmest stretch (~77°F) and December its coldest (~59°F); precipitation crests in January at 3.2 inches and ebbs in August to 0.0 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 60° | 3.2″ | 5 |
| February | 60° | 3.0″ | 5 |
| March | 63° | 1.8″ | 3 |
| April | 65° | 0.7″ | 2 |
| May | 68° | 0.4″ | 1 |
| June | 72° | 0.1″ | 0 |
| July | 76° | 0.1″ | 0 |
| August | 77° | 0.0″ | 0 |
| September | 76° | 0.1″ | 0 |
| October | 71° | 0.6″ | 1 |
| November | 65° | 1.0″ | 2 |
| December | 59° | 2.4″ | 4 |
Regional context
Similar climates Tustin, CA, Laguna Woods, CA, Lake Forest, CA
By the nearest station's NOAA NCEI 1991-2020 normals, Irvine sees 60°F Januarys and 76°F Julys, a 16°F range, plus around 13.5 inches of precipitation across 23 days.
Irvine's moisture rides winter storm tracks: January brings 3.2 inches over 4.5 wet days, while August sees only 0.0 inches across 0.0 days in the dry warm season. That groups Irvine with places like Tustin, CA, Laguna Woods, CA and Lake Forest, CA on the same cool-season storm track.
Freezes are uncommon in Irvine, where the coldest month averages 59°F; cool-season crops grow fall through spring. Summer heat in August (about 77°F) is the binding constraint, not cold. Irvine's open lawns chill fastest on clear nights.
Similar climates: Tustin, CA, Laguna Woods, CA, Lake Forest, CA, North Tustin, CA, Newport Beach, CA.
Frequently asked
- When does it freeze in Irvine?
- Most years Irvine doesn't freeze: the nearest NOAA station reached 32°F in 4% of 1991–2020 years, so Irvine has no reliable frost date.
- What is the rainy season in Irvine?
- January is the wettest month in Irvine, about 3.2 inches on average; the year totals roughly 14 inches.
- What is the warmest month in Irvine?
- Irvine peaks in August, when the mean runs near 77°F.
- What is the coldest month in Irvine?
- December is Irvine's coldest month, averaging about 59°F.
- When can I start a vegetable garden in Irvine?
- Any season works in Irvine: without a reliable freeze, Irvine's heat, not frost, decides when greens and tomatoes do best.
- How many rainy days does Irvine get?
- Irvine records around 23 days of measurable precipitation annually.
- What hardiness zone is Irvine?
- With December around 59°F, Irvine's zone reflects that minimum — the USDA ZIP map confirms Irvine's band.
- What is the 10-day forecast for Irvine?
- Irvine'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 Irvine?
- See this week's day-by-day rain chances for Irvine in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Irvine?
- Current conditions for Irvine and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Irvine forecast updated?
- The Irvine forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Irvine?
- Today's sunrise and sunset times for Irvine 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 Irvine?
- The next few days in Irvine's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Irvine sits at 33.7°N; its climate zone is hot-summer Mediterranean (Köppen approximation).
ZIP codes in Irvine
- 92602
- 92603
- 92604
- 92606
- 92612
- 92614
- 92616
- 92617
- 92618
- 92619
- 92620
- 92650
- 92697
- 92698