Heat Advisory
* WHAT...High temperatures in the mid 90s to 105 expected.
* WHERE...San Bernardino and Riverside County Valleys-The Inland
Empire.
* WHEN...Until 8 PM PDT Sunday.
* IMPACTS...Hot temperatures may cause heat illnesses.
Extreme Heat Warning
* WHAT...Dangerously hot conditions with high temperatures of 108 to
114 expected.
* WHERE...Coachella Valley, San Diego County Deserts, and San
Gorgonio Pass near Banning.
* WHEN...Until 8 PM PDT Sunday.
* IMPACTS...Heat related illnesses increase significantly during
extreme…
Heat Advisory
* WHAT...High temperatures mostly in the mid 80s to low 100s below
6500 feet expected.
* WHERE...Riverside County Mountains.
* WHEN...Until 8 PM PDT Saturday.
* IMPACTS...Hot temperatures may cause heat illnesses.
Tomorrow in Irvine looks
sunny, with a high of 83°
and an overnight low of 71°.
Rain is unlikely (4% chance).
Winds top out near 9 mph,
and the UV index reaches 10 (very high).
Weather in Irvine is shaped by its semi-arid climate - expect big day-to-night temperature swings and modest rainfall. August afternoons typically reach 83°F (28°C), while January highs hover near 65°F (18°C). Annual precipitation averages 14.6 inches (370 mm) over about 40 rainy days.
Irvine weather: quick facts
Hottest month: August - highs near 83°F (28°C)
Coldest month: January - highs near 65°F (18°C)
Record high: 108°F (42°C) · Record low: 34°F (1°C) (2015–2024)
Wettest month: January (6 rainy days) · Sunniest: July (13.4 h sun/day)
Climate type:semi-arid - big day-to-night temperature swings and modest rainfall
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 83°F (28°C) and overnight lows stay near 65°F (18°C). The coolest month is January, with typical highs of 65°F (18°C) and lows around 48°F (9°C). Based on 2015–2024 weather data, temperatures have reached as high as 108°F (42°C) and dropped as low as 34°F (1°C).
Rain, sun and snow
January is usually the wettest month. It brings about 3.1 inches (80 mm) of rain over 6 days, while July is the driest. July brings the most sunshine, averaging 13.4 hours of sun a day.
Season by season
Spring (March through May)
Spring in Irvine is pleasantly warm, with daytime highs averaging 70°F (21°C) and nights around 53°F (12°C); rain falls on about 15 days over the three months.
Summer (June through August)
Summer in Irvine is mild and warm, with daytime highs averaging 80°F (27°C) and nights around 63°F (17°C); precipitation is infrequent.
Fall (September through November)
Fall in Irvine is mild and warm, with daytime highs averaging 78°F (25°C) and nights around 59°F (15°C); precipitation is infrequent.
Winter (December through February)
Winter in Irvine is mild, with daytime highs averaging 66°F (19°C) and nights around 48°F (9°C); rain falls on about 16 days over the three months.
Average temperatures in Irvine by month
Monthly averages for Irvine based on 2015–2024 weather data.
August is the hottest month in Irvine, with average highs of 83°F (28°C) and overnight lows near 65°F (18°C). In the past decade the temperature has peaked at 108°F (42°C).
What is the coldest month in Irvine?
January is the coldest month, with highs averaging 65°F (18°C) and lows around 48°F (9°C). The lowest reading in recent years was 34°F (1°C).
What is the rainiest month in Irvine?
January is typically the wettest month, averaging 3.1 inches (80 mm) of precipitation across about 6 days. July is usually the driest.
Does it snow in Irvine?
Snow is essentially absent in Irvine - the 2015–2024 record shows no regular measurable snowfall.
What is the best time to visit Irvine?
The best time to visit Irvine is generally January to June, when temperatures are at their most comfortable before or after the peak heat. Daytime temperatures in that window typically sit near 70°F (21°C).
How sunny is Irvine?
Irvine averages 10.8 hours of sunshine per day across the year. July is the sunniest month at about 13.4 hours of sun a day.
Is Irvine humid?
Relative humidity in Irvine averages about 70% over the year, which feels fairly humid. Combined with August heat, muggy conditions are common in summer - the dew point is the number to watch.