Average annual temperature is 22.0 °C
Absolute maximum temperature: 41.8 °C
Absolute minimum temperature: 0.4 °C
Number of sunny days: 171 days
Number of rainy days: 194 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) | 25.7 | 27.7 | 30.2 | 31.1 | 31.8 | 37.3 | 39.1 | 41.8 | 40.0 | 35.4 | 29.8 | 26.2 |
| Average daytime temperature (°C) | 19.1 | 20.3 | 24.1 | 25.1 | 28.5 | 34.2 | 36.3 | 38.8 | 35.1 | 28.3 | 20.9 | 19.9 |
| Average temperature (°C) | 14.2 | 14.4 | 18.9 | 19.6 | 23.6 | 28.3 | 30.3 | 32.0 | 29.2 | 22.7 | 16.1 | 14.0 |
| Average night temperature (°C) | 10.4 | 10.3 | 14.9 | 15.4 | 19.7 | 23.7 | 25.6 | 26.5 | 24.4 | 18.5 | 12.5 | 9.8 |
| Absolute minimum temperature (°C) | 1.2 | 0.4 | 4.0 | 11.5 | 13.8 | 18.1 | 23.4 | 24.3 | 21.6 | 6.8 | 4.1 | 2.3 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.1 | 12.0 | 12.9 | 13.6 | 14.0 | 13.8 | 13.2 | 12.3 | 11.5 | 10.7 | 10.3 |
| 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) | 6.3 | 7.3 | 7.3 | 8.1 | 8.8 | 11.8 | 12.4 | 12.1 | 10.6 | 8.4 | 6.3 | 7.8 |
| Precipitation (mm) | 131 | 51 | 73 | 241 | 260 | 63 | 43 | 8 | 66 | 88 | 73 | 34 |
| Sunny days | 16 | 13 | 9 | 8 | 5 | 18 | 16 | 23 | 11 | 16 | 15 | 21 |
| Rainy days | 15 | 15 | 22 | 22 | 26 | 12 | 15 | 8 | 19 | 15 | 15 | 10 |
| 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