Heat Advisory
* WHAT...High temperatures in the mid 80s near the beaches to the
lower to mid 90s for higher coastal terrain expected. Low
temperatures mostly in the 70s.
* WHERE...Orange County Coastal Areas.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnes…
Extreme Heat Warning
* WHAT...Dangerously hot conditions with high temperatures in the mid
90s to 105 expected. Low temperatures will be mostly in the 70s.
* WHERE...Orange County Inland Areas.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme…
Heat Advisory
* WHAT...High temperatures in the mid 80s near the beaches to the
lower to mid 90s for higher coastal terrain expected. Low
temperatures mostly in the 70s.
* WHERE...Orange County Coastal Areas.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Heat related illnesses increase signif…
Tomorrow in Irvine looks
overcast, with a high of 93°
and an overnight low of 77°.
Precipitation chance is modest at 17%.
Winds top out near 8 mph,
and the UV index reaches 10 (very high).
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
Monthly averages for Irvine based on 2015–2024 weather data.
January, at 3.1 inches (80 mm) over about 6 days. July is the driest month, at 3 mm (0.1 in).
What is the best month to go to Irvine?
The best time to visit Irvine is generally January to June, when temperatures sit either side of the peak heat rather than in it. Daytime temperatures in that window sit near 70°F (21°C), with rain on about 4 days a month. For the same question asked the other way round, see where else is warm in January.
How warm is Irvine on average?
64°F (18°C) across all twelve months - about 73°F (23°C) by day and 56°F (13°C) after dark.
What should I pack for Irvine?
It depends on the month: August runs to 83°F (28°C) while January holds at 65°F (18°C). The full month-by-month breakdown is in the packing notes above.
How often does it rain in Irvine?
About 40 days bring measurable precipitation, totalling 14.6 inches (370 mm). That works out at roughly 9.2 mm on an average wet day.
What is the coldest month in Irvine?
January, with highs of 65°F (18°C) and lows near 48°F (9°C). The coldest day in the 2015-2024 record fell to 34°F (1°C).
Is there snow in Irvine?
Effectively no. The 2015-2024 record for Irvine shows no regular measurable snowfall.
When is Irvine at its hottest?
August, averaging 83°F (28°C) by day and 65°F (18°C) overnight. The hottest single day in our 2015-2024 record for this location reached 108°F (42°C).