Warm
Average highs sit around 28°C, giving warm days by monthly-average standards.
September verdict
Irvine, California, United States in September
Weather score78Very good
Very good for holiday weather
Average highs sit around 28°C, giving warm days by monthly-average standards. Sunshine averages 9.1h per day, so bright days are a strong part of the month. Rainfall averages 6mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
28°C
Rain
6mm
Sun
9.1h
Sea
21°C
Weather score
78
Very good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 6mm, which is relatively low for holiday planning.
Bright
Sunshine averages 9.1h per day, so bright days are a strong part of the month.
Cool sea
Sea temperatures average 21°C, so the water can feel cool.
Map
Weather map
Compare Irvine, California, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September28°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
September6mm average rain
September is one of Irvine's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsApril to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September9.1 hours average sun
September sits close to Irvine's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September21°C average sea
September is one of Irvine's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.
Weather score
September78 weather score
September scores above Irvine's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJuly to September
These months have the strongest weather score in the monthly averages.
Hotels in Irvine, California, United States
Marriott
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