Irvine, CA Weather
Irvine hourly forecast: next 24 hours
Today's high of 79°F (26°C) is about 3°F (2°C) below the typical September high of 82°F (28°C).
Current conditions in detail
Irvine weather tomorrow (Wednesday, September 16)
Tomorrow in Irvine looks sunny, with a high of 77° and an overnight low of 65°. Rain is unlikely (4% chance). Winds top out near 11 mph, and the UV index reaches 8 (very high).
Irvine 14-day forecast
About the weather in Irvine
Irvine runs on a dry-summer rhythm: the warmest months are also the driest. July averages 3 mm (0.1 in) while the wet season peaks in January at 3.1 inches (80 mm). Highs range from 65°F (18°C) to 83°F (28°C).
Irvine weather: quick facts
- Hottest month: August - highs near 83°F (28°C)
- Coldest month: January - highs near 65°F (18°C)
- Decade extremes (2015-2024): 108°F (42°C) high · 34°F (1°C) low
- Wettest month: January (6 rainy days) · Sunniest: July (13.4 h sun/day)
- Climate type: semi-arid
- Annual swing: 9°C between the average warmest and coolest month · day to night: 10°C
- Average humidity: 70%
Temperatures through the year
Warmth peaks in August: highs of 83°F (28°C), lows of 65°F (18°C). January sits at the other end of the year: 65°F (18°C) by day, 48°F (9°C) at night. The gridded 2015-2024 daily record for this location tops out at 108°F (42°C) and bottoms at 34°F (1°C) - decade extremes, not all-time station records. Between the average August and the average January lie 9°C, a narrower spread than about 78% of the cities we track.
Rain, sun and snow
6 months average under 20 mm of rain, the longest unbroken stretch running May through October. Precipitation concentrates in January - 3.1 inches (80 mm) on 6 days - and thins out by July.
Season by season
Spring (March through May)
Spring brings comfortable warmth here - highs near 70°F (21°C), nights near 53°F (12°C), and rain comes on about 15 days over the three months. Daylight is generous - around 11.2 hours of sun a day.
Summer (June through August)
Summer in Irvine settles into easy warmth, with daytime highs averaging 80°F (27°C) and nights around 63°F (17°C); precipitation is sparse, near 16 mm (0.6 in) for the season. Daylight is generous - around 12.9 hours of sun a day.
Fall (September through November)
Fall brings comfortable warmth here - highs near 78°F (25°C), nights near 59°F (15°C), and precipitation is sparse, near 1.8 inches (46 mm) for the season. Daylight is generous - around 10.4 hours of sun a day.
Winter (December through February)
Through winter, Irvine runs cool rather than cold: 66°F (19°C) by day, 48°F (9°C) after dark, and rain comes on about 16 days over the three months.
Average temperatures in Irvine by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 65° | 48° | 6 | 3.1 in | 8.4 h/day | 69% |
| February | 66° | 48° | 6 | 2.6 in | 9.1 h/day | 65% |
| March | 67° | 50° | 8 | 2.4 in | 10.4 h/day | 72% |
| April | 71° | 54° | 4 | 0.8 in | 11.3 h/day | 70% |
| May | 71° | 56° | 3 | 0.6 in | 12.0 h/day | 74% |
| June | 77° | 60° | 1 | 0.2 in | 13.0 h/day | 73% |
| July | 81° | 64° | 0 | 0.1 in | 13.4 h/day | 74% |
| August | 83° | 65° | 1 | 0.3 in | 12.4 h/day | 74% |
| September | 82° | 64° | 2 | 0.4 in | 11.3 h/day | 73% |
| October | 79° | 60° | 2 | 0.5 in | 10.3 h/day | 68% |
| November | 72° | 53° | 2 | 0.8 in | 9.5 h/day | 60% |
| December | 66° | 48° | 5 | 2.5 in | 8.1 h/day | 66% |