San Diego (CA) Climate by Month
San Diego is a year-round destination with a semi arid and Mediterranean climate. The climate in San Diego often varies significantly over short geographical distances, resulting in different microclimates. In general you will experience warm, dry summers and mild winters. Most rain is seen between November and March.
Snow and ice are rare in wintertime. The record low temperature was -4°C. San Diego has on average around 145 sunny days and 115 cloudy days a year. There are an average of 40 days with measurable precipitation.
The best time to visit California and San Diego largely depends on what your destination is and exactly which places you want to visit within the state. For the coastal areas, different travel advice applies than for the Sierra Nevada mountain area or the Death Valley National Park. If you want to take a tour of California visiting all three areas, May, June and September are the best months.
Average day and night temperature
The weather in San Diego changes moderately throughout the year, offering enough variation to appreciate each season. Average daytime temperatures reach a comfortable 26°C in September. In January, the coolest month of the year, temperatures drop to a pleasant 19°C. At night, expect cooler temperatures, averaging 9°C during this month.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
San Diego has a dry climate with very low precipitation, averaging 226 mm of rainfall annually. San Diego can be quite wet during December, receiving approximately 59 mm of precipitation over 7 rainy days. In contrast June, experiences much drier conditions, with 0.4 mm of rainfall, spread across a single rainy day.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
San Diego experiences moderate variation in sunshine hours across the seasons. With 10.1 hours daily sunshine in July, it dips to 7.7 hours in February, offering a balanced mix of sunny and overcast days.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is low throughout the year in San Diego.
Relative humidity over the year
The best time of year to visit San Diego in the United States of America
During the months of March, April, May, June, July, August, September, October and November you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in July, August, September and October.
September has an average maximum temperature of 26°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 19°C.
December tops the wettest month list with 59 mm of rainfall.
June is the driest month with 0 mm of precipitation.
July is the sunniest month with an average of 304 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
