Average annual temperature is 22.5 °C
Absolute maximum temperature: 32.6 °C
Absolute minimum temperature: 13.1 °C
Number of sunny days: 47 days
Number of rainy days: 318 days
Look at detailed online map of Grantham
* Weather data for Grantham Jamaica is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 27.8 | 28.6 | 29.0 | 29.0 | 30.1 | 31.0 | 32.0 | 32.0 | 32.6 | 32.3 | 29.1 | 28.0 |
| Average daytime temperature (°C) | 25.6 | 26.3 | 26.6 | 27.2 | 28.3 | 27.9 | 29.8 | 30.0 | 30.0 | 28.8 | 27.2 | 25.9 |
| Average temperature (°C) | 20.2 | 20.5 | 20.8 | 21.6 | 23.0 | 23.6 | 24.2 | 24.4 | 24.3 | 23.7 | 22.6 | 21.5 |
| Average night temperature (°C) | 16.2 | 16.3 | 16.5 | 17.2 | 19.1 | 20.4 | 19.9 | 20.6 | 20.3 | 20.5 | 19.5 | 18.5 |
| Absolute minimum temperature (°C) | 13.1 | 14.2 | 13.1 | 14.8 | 17.4 | 18.3 | 18.6 | 19.0 | 18.6 | 18.4 | 17.3 | 16.2 |
| 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 | 11.6 | 12.0 | 12.6 | 13.0 | 13.2 | 13.1 | 12.7 | 12.2 | 11.7 | 11.3 | 11.1 |
| 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) | 10.3 | 10.6 | 10.3 | 11.3 | 11.0 | 10.2 | 11.6 | 10.7 | 10.5 | 10.0 | 9.0 | 9.4 |
| Precipitation (mm) | 22 | 22 | 74 | 81 | 103 | 116 | 61 | 97 | 95 | 123 | 169 | 32 |
| Sunny days | 10 | 10 | 11 | 2 | 1 | 2 | 4 | 2 | 0 | 1 | 1 | 3 |
| Rainy days | 21 | 18 | 20 | 28 | 30 | 28 | 27 | 29 | 30 | 30 | 29 | 28 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Grantham is at