Average annual temperature is 26.8 °C
Absolute maximum temperature: 36.0 °C
Absolute minimum temperature: 18.6 °C
Number of sunny days: 69 days
Number of rainy days: 296 days
Look at detailed online map of Viejo San Juan
* Weather data for Viejo San Juan Puerto Rico is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 29.7 | 29.5 | 32.5 | 31.3 | 34.4 | 36.0 | 31.5 | 32.9 | 32.2 | 32.3 | 30.8 | 29.5 |
| Average daytime temperature (°C) | 27.8 | 28.0 | 29.3 | 29.5 | 32.5 | 33.5 | 29.9 | 30.4 | 30.7 | 30.2 | 29.1 | 27.4 |
| Average temperature (°C) | 24.2 | 24.6 | 25.1 | 25.4 | 27.6 | 29.1 | 28.2 | 28.3 | 28.4 | 27.7 | 27.1 | 25.7 |
| Average night temperature (°C) | 21.3 | 21.7 | 21.5 | 21.8 | 23.7 | 25.6 | 26.4 | 26.3 | 26.2 | 25.7 | 25.3 | 23.9 |
| Absolute minimum temperature (°C) | 19.3 | 19.1 | 18.6 | 19.0 | 22.7 | 24.4 | 24.2 | 24.5 | 24.7 | 24.4 | 23.7 | 21.5 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.2 | 11.5 | 12.0 | 12.6 | 13.0 | 13.2 | 13.1 | 12.7 | 12.2 | 11.7 | 11.3 | 11.0 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 13.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 10.0 | 10.7 | 11.0 | 11.1 | 11.5 | 11.8 | 11.0 | 10.4 | 11.0 | 9.5 | 9.1 | 10.0 |
| Precipitation (mm) | 78 | 54 | 27 | 83 | 74 | 79 | 98 | 113 | 73 | 122 | 75 | 67 |
| Sunny days | 5 | 6 | 10 | 2 | 4 | 7 | 7 | 4 | 3 | 5 | 9 | 7 |
| Rainy days | 26 | 22 | 21 | 28 | 27 | 23 | 24 | 27 | 27 | 26 | 21 | 24 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Viejo San Juan is at