The warmest month in San Diego is August, with an average high of 25.4°C and an average low of 18.9°C. The coldest month is January, with an average high of 17.4°C and an average low of 8.7°C. Between 2016 and 2025, the highest temperature recorded was 36.6°C (September 30, 2020) and the lowest was 1.9°C (February 5, 2020).
| Month | Avg. high | Avg. low | Precipitation |
|---|---|---|---|
| January | 17.4°C | 8.7°C | 74 mm |
| February | 17.9°C | 8.9°C | 56 mm |
| March | 17.7°C | 10.3°C | 64 mm |
| April | 19.6°C | 12.3°C | 21 mm |
| May | 20°C | 14.1°C | 13 mm |
| June | 22.2°C | 15.9°C | 2 mm |
| July | 24.4°C | 18.2°C | 3 mm |
| August | 25.4°C | 18.9°C | 8 mm |
| September | 25.2°C | 18.1°C | 14 mm |
| October | 23.9°C | 15.1°C | 14 mm |
| November | 21.1°C | 11.6°C | 36 mm |
| December | 18.2°C | 9.3°C | 56 mm |
Based on daily historical weather data 2016–2025. Weather data by Open-Meteo.com.
Explore detailed temperature patterns in San Diego, United States through interactive candlestick charts. View historical weather data with daily temperature ranges, trends, and variations. Whether you're planning a trip to San Diego or analyzing local climate patterns, our unique visualization makes temperature data easy to understand. Get insights into San Diego's weather patterns from hourly updates to yearly historical data.