Irvine, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Irvine weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Foggy——77°63°—
- FridayJun 5Overcast——77°61°0°
- SaturdayJun 6Overcast——74°60°-3°
- SundayJun 7Overcast——74°62°0°
- MondayJun 8Mostly Clear——74°61°0°
- TuesdayJun 9Overcast——73°62°-1°
- WednesdayJun 10Mostly Clear——75°60°+2°
Ozone at AQI 98 now. AQI flat over the last 6 hours (within ±3 points). With UV 10 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 93 by mid-afternoon.
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 98 now. With UV 10 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 93 by mid-afternoon.
- Present
- AQI 98
- UV peak
- 10.1 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 93
PM × Wind × Precip
PM2.5 at 16.9 µg/m³ (AQI 66) with a 0.68 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.68
- Wind
- light
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:03 AM
- Moonset
- 4:15 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Irvine at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: March 9 (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 Irvine's warmest temperatures at around 77°F mean, while December delivers the coldest at approximately 59°F. January sees peak rainfall with 3.2 inches, contrasting sharply with August's bone-dry 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
Located within a hot-summer Mediterranean climate region, Irvine shares temperature ranges, seasonal patterns, and growing conditions with other nearby cities in this climate zone.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, 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?
- Spring's last frost typically occurs around mid-March in Irvine, while the first fall frost arrives around mid-December.
- What is the rainy season in Irvine?
- January stands as the wettest month, delivering about 3.2 inches of rain on average, while the city receives roughly 14 inches annually.
- What is the warmest month in Irvine?
- August typically brings the warmest weather, averaging about 77°F.
- What is the coldest month in Irvine?
- December typically delivers the coldest temperatures, averaging about 59°F.
- When can I start a vegetable garden in Irvine?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-March, while warm-season crops such as tomatoes and peppers should wait until 1–2 weeks after.
- How many rainy days does Irvine get?
- Irvine experiences about 23 rainy days per year on average.
- What hardiness zone is Irvine?
- Irvine's USDA hardiness zone depends on its lowest average winter temperature; the USDA's online lookup tool can provide the current zone designation using the city ZIP code.
Climate
Irvine, California experiences a hot-summer Mediterranean climate. January temperatures hover near 60°F while July averages 76°F, creating a 16°F seasonal swing.
Annual precipitation totals about 14 inches, falling across roughly 23 rainy days throughout the year.
Weather patterns here follow the city's latitude at 33.7°N, along with its proximity to large water bodies and elevation. These factors determine what grows in the area, when frost occurs, and daily weather conditions.