Irvine, California Weather
August begins in scorching stillness. Day 43 of summer. Read this microseason across nine climate regions →
Irvine weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Foggy——89°70°—
- MondayAug 3Overcast——86°66°-3°
- TuesdayAug 4Overcast——90°68°+4°
- WednesdayAug 5Clear——92°73°+2°
- ThursdayAug 6Clear——87°73°-5°
- FridayAug 7Clear——87°73°0°
- SaturdayAug 8Clear——88°73°+1°
AQI 51 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.5 µg/m³ (AQI 47) with a 0.65 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 8.5 µg/m³ (AQI 47) with a 0.65 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.65
- 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).
Red sky at night, sailor's delight.
- Moonrise
- 9:36 PM
- Moonset
- 10:01 AM
- In sign
- ♓︎ Pisces
August begins in scorching stillness
Irvine at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: March 9 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
ZIP codes: 92602, 92603, 92604, 92606, 92612, 92614, 92617, 92618 +2 more
16-Day Forecast — Irvine
- Sun89°70°0%
- Mon86°66°0%
- Tue90°68°0%
- Wed92°73°0%
- Thu87°73°1%
- Fri87°73°1%
- Sat88°73°0%
- Sun88°73°1%
- Mon84°73°2%
- Tue85°72°1%
- Wed86°71°1%
- Thu89°72°3%
- Fri89°73°7%
- Sat89°74°2%
- Sun90°73°6%
- Mon85°72°3%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Irvine
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 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’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.
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
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 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
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. Within Irvine, low or inland lots lose 3-5°F overnight versus Irvine's coastal ground.
Similar climates: Tustin, CA, Laguna Woods, CA, Lake Forest, CA, North Tustin, CA, Newport Beach, CA.
Naturalist notes
California poppies typically reach peak bloom in late April across Irvine's open spaces.
Allen's hummingbirds begin their northward migration through the area in late February.
Frequently asked
- When does it freeze in Irvine?
- In Irvine, expect the last spring frost near mid-March; Irvine's first autumn frost comes around mid-December.
- 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?
- In Irvine, sow peas and hardy greens around mid-March; Irvine's tomatoes and peppers wait two weeks more.
- 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.
Climate
The hot-summer Mediterranean climate of Irvine, California carries typical Januarys near 60°F and Julys around 76°F — 16°F of seasonal travel.
Across the year, Irvine collects about 14 inches of precipitation over roughly 23 days with measurable rain or snow.
Irvine sits at 33.7°N; that 16°F seasonal swing frames planting windows and frost dates across Irvine.
ZIP codes in Irvine
- 92617
- 92614
- 92612
- 92618
- 92697
- 92620
- 92602
- 92603
- 92604
- 92606
- 92616
- 92619
- 92650
- 92698