Average annual temperature is 21.6 °C
Absolute maximum temperature: 42.4 °C
Absolute minimum temperature: 0.4 °C
Number of sunny days: 130 days
Number of rainy days: 235 days
Look at detailed online map of Rock Island
* Weather data for Rock Island 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) | 24.7 | 26.8 | 29.5 | 29.1 | 31.7 | 37.6 | 39.2 | 42.4 | 39.4 | 35.2 | 28.6 | 24.4 |
| Average daytime temperature (°C) | 18.8 | 20.0 | 23.4 | 24.5 | 28.5 | 33.4 | 35.7 | 38.4 | 34.5 | 27.6 | 20.8 | 18.9 |
| Average temperature (°C) | 14.1 | 14.8 | 18.6 | 19.4 | 23.5 | 27.8 | 29.9 | 31.6 | 28.2 | 21.9 | 15.8 | 13.3 |
| Average night temperature (°C) | 10.3 | 11.0 | 14.7 | 15.6 | 19.4 | 23.7 | 25.7 | 26.5 | 23.6 | 17.8 | 12.1 | 9.2 |
| Absolute minimum temperature (°C) | 1.1 | 0.4 | 2.6 | 9.6 | 12.3 | 19.8 | 23.6 | 23.1 | 19.2 | 8.1 | 3.8 | 0.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.1 | 12.0 | 12.9 | 13.7 | 14.0 | 13.9 | 13.2 | 12.3 | 11.4 | 10.7 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 6.1 | 7.3 | 7.6 | 7.8 | 8.6 | 10.9 | 12.2 | 12.2 | 10.7 | 8.6 | 6.8 | 7.5 |
| Precipitation (mm) | 267 | 129 | 103 | 257 | 198 | 100 | 49 | 19 | 54 | 84 | 124 | 136 |
| Sunny days | 13 | 8 | 7 | 5 | 7 | 8 | 5 | 17 | 7 | 17 | 16 | 20 |
| Rainy days | 18 | 20 | 24 | 25 | 24 | 22 | 26 | 14 | 23 | 14 | 14 | 11 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Rock Island during the most sunny months:
The largest precipitation sum in Rock Island is at