Warm
Average highs sit around 26°C, giving warm days by monthly-average standards.
September verdict
San Diego, California, United States in September
Weather score78Very good
Very good for holiday weather
Average highs sit around 26°C, giving warm days by monthly-average standards. Sunshine averages 8.5h per day, so bright days are a strong part of the month. Rainfall averages 4mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
26°C
Rain
4mm
Sun
8.5h
Sea
21°C
Weather score
78
Very good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 4mm, which is relatively low for holiday planning.
Bright
Sunshine averages 8.5h 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 San Diego, California, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September26°C average high
September is one of San Diego's warmest months, with daytime heat above the yearly average.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
September4mm average rain
September is one of San Diego'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
September8.5 hours average sun
September sits close to San Diego's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril and July to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September21°C average sea
September is one of San Diego's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
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 San Diego'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 San Diego, California, United States
Marriott
View all
The US Grant, a Luxury Collection Hotel, San DiegoSan Diego, California, USA
Marriott Marquis San Diego MarinaSan Diego, California, USA
San Diego Marriott Del MarSan Diego, California, USA
San Diego Marriott Gaslamp QuarterSan Diego, California, USA
San Diego Marriott Mission ValleySan Diego, California, USA
The Westin San Diego BayviewSan Diego, California, USA