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When is the best time to visit San Diego?
In general the best time to visit San Diego is probably September, when the weather is usually great. The hottest months are August, September, October, while the coldest months are January, February, December.
The best time to visit may differ depending on what you are looking for:
- In general, it’s pleasant to walk and do outdoor activities during January - December.
- If you want to avoid wet weather, then your choice is July, August, September with the lowest chance of rain.
Average weather in San Diego in different months
This is the average weather in San Diego for each month based on historic data:
January, February, March, April, May, June, July, August, September, October, November, December usually has good weather. Average maximum temperature reaches +24°C during August.
Climate in San Diego
Here is the detailed breakdown of the climate in San Diego for each month:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum Temperature | |||||||||||
| +30°C | +30°C | +31°C | +35°C | +36°C | +34°C | +35°C | +31°C | +38°C | +36°C | +35°C | +27°C |
| Average Maximum Temperature | |||||||||||
| +18°C | +18°C | +19°C | +20°C | +20°C | +21°C | +23°C | +24°C | +24°C | +23°C | +21°C | +18°C |
| Minimum Temperature | |||||||||||
| +3°C | +3°C | +6°C | +6°C | +10°C | +12°C | +15°C | +16°C | +13°C | +9°C | +5°C | +3°C |
| Avg. water temperature | |||||||||||
| +16°C | +16°C | +17°C | +17°C | +19°C | +20°C | +21°C | +21°C | +21°C | +20°C | +18°C | +17°C |
| Humidity, % | |||||||||||
| 68 | 68 | 70 | 70 | 72 | 75 | 76 | 76 | 75 | 71 | 67 | 67 |
| Rain, mm | |||||||||||
| 69 | 84 | 64 | 27 | 10 | 3 | 2 | 4 | 10 | 20 | 34 | 53 |
| Snow, mm | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Average wind speed, m/s | |||||||||||
| 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 |
| Sunny Days | |||||||||||
| 8 | 7 | 6 | 7 | 4 | 3 | 3 | 5 | 6 | 8 | 9 | 10 |
| Cloud Days | |||||||||||
| 13 | 11 | 14 | 15 | 21 | 24 | 26 | 24 | 20 | 17 | 14 | 12 |
| Rainy Days | |||||||||||
| 10 | 10 | 10 | 8 | 7 | 3 | 2 | 2 | 4 | 6 | 7 | 9 |
| Snowy Days | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Average Temperature
Here are the average maximum and minimum temperatures in San Diego during the whole year:
The hottest month in San Diego is September with average maximum temperature going up to +24°C. The coldest month is January with the lowest temperatures of +10°C.
Water temperature
Here are the water temperatures in San Diego during the whole year:
San Diego achieves its warmest water temperature in August, where the average sea temperature goes up to +20°C. Coldest water temperature is in February with +15°C in average.
Humidity
The temperature feels different depending on humidity. Here is how humidity in San Diego looks throughout the year, in %:
The most humid month in San Diego is August with average humidity going up to 76%. The least humid month is November with an average humidity of 67%.
Rain
Amount of rainfall in mm. in San Diego during the whole year based on historical data:
The sunniest and driest month is December with approximately 10 sunny days and a total precipitation of around 53 mm. The rainiest and wettest month is February with approximately 10 rainy days and 84 mm of total precipitation.
FAQ
Frequently asked questions about the weather in San Diego:
What is the hottest month in San Diego?
The hottest month in San Diego is September with average maximum temperature of +24°C.
What is the coldest month in San Diego?
The coldest month in San Diego is January with minimum temperatures of +10°C.
Is San Diego worth visiting in winter?
If you are planning to visit San Diego in winter you can expect pretty good weather. The best month is September with +24°C and 6 sunny days.
When does it rain the least in San Diego?
if you're looking to visit San Diego when it rains the least, you should plan your trip for February, January, March. During this time, rainfall is rare with the driest month being July with only 2 mm of rain.
Other cities in USA
Check out the weather for other cities in USA.
Monthly weather in San Diego
Source of the data
For this page, we’ve looked at the typical weather in San Diego, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.