Average annual temperature is 17.8 °C
Absolute maximum temperature: 41.3 °C
Absolute minimum temperature: -5.4 °C
Number of sunny days: 203 days
Number of rainy days: 162 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) | 22.8 | 25.0 | 27.7 | 29.5 | 32.3 | 39.9 | 39.9 | 41.3 | 36.8 | 32.4 | 28.5 | 20.6 |
| Average daytime temperature (°C) | 13.2 | 15.5 | 18.5 | 22.6 | 27.6 | 32.7 | 35.1 | 35.9 | 31.4 | 24.0 | 18.0 | 13.5 |
| Average temperature (°C) | 7.8 | 9.0 | 12.0 | 15.9 | 21.2 | 26.1 | 28.7 | 29.1 | 24.9 | 18.3 | 11.6 | 8.3 |
| Average night temperature (°C) | 3.5 | 4.5 | 7.0 | 10.4 | 15.8 | 20.4 | 23.6 | 23.6 | 19.3 | 14.0 | 6.7 | 4.2 |
| Absolute minimum temperature (°C) | -3.9 | -5.4 | -3.9 | 5.9 | 6.8 | 17.0 | 19.4 | 17.5 | 15.5 | -0.3 | -2.1 | -1.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.9 | 6.0 | 7.9 | 9.0 | 10.5 | 12.2 | 11.7 | 11.8 | 10.5 | 8.0 | 7.8 | 6.6 |
| Precipitation (mm) | 85 | 133 | 222 | 121 | 91 | 62 | 96 | 69 | 63 | 103 | 47 | 78 |
| Sunny days | 16 | 13 | 15 | 17 | 13 | 15 | 12 | 19 | 21 | 18 | 23 | 21 |
| Rainy days | 15 | 15 | 16 | 13 | 18 | 15 | 19 | 12 | 9 | 13 | 7 | 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