Average annual temperature is 13.3 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: -6.5 °C
Number of sunny days: 244 days
Number of rainy days: 119 days
Number of snow days: 2 days
Look at detailed online map of San Ysidro
* Weather data for San Ysidro United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 15.1 | 16.0 | 16.0 | 29.1 | 29.2 | 33.8 | 37.8 | 34.6 | 32.6 | 30.8 | 26.2 | 19.2 |
| Average daytime temperature (°C) | 8.9 | 8.4 | 9.4 | 18.7 | 19.9 | 22.7 | 32.8 | 29.6 | 25.5 | 22.7 | 16.3 | 14.2 |
| Average temperature (°C) | 5.0 | 3.9 | 5.1 | 11.7 | 13.4 | 15.3 | 25.5 | 23.0 | 18.7 | 16.6 | 11.4 | 9.3 |
| Average night temperature (°C) | 1.9 | 0.5 | 1.9 | 6.3 | 8.2 | 9.7 | 18.8 | 17.3 | 13.5 | 11.6 | 7.8 | 5.5 |
| Absolute minimum temperature (°C) | -1.8 | -5.2 | -6.5 | -3.7 | 2.7 | 5.5 | 11.9 | 11.5 | 8.5 | 5.4 | 2.5 | 1.3 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.3 | 14.1 | 13.4 | 12.4 | 11.4 | 10.5 | 10.0 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 6.3 | 7.9 | 7.2 | 11.4 | 12.1 | 12.8 | 12.8 | 11.6 | 10.7 | 10.2 | 8.6 | 8.1 |
| Precipitation (mm) | 245 | 112 | 231 | 8 | 29 | 31 | 4 | 85 | 27 | 8 | 55 | 23 |
| Sunny days | 14 | 14 | 12 | 26 | 19 | 25 | 26 | 18 | 20 | 26 | 22 | 22 |
| Rainy days | 17 | 13 | 18 | 4 | 12 | 5 | 5 | 13 | 10 | 5 | 8 | 9 |
| Snow days | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit San Ysidro during the most sunny months:
The largest precipitation sum in San Ysidro is at