Best year time to visit Rock Island

General weather information about Rock Island

Average annual temperature is 16.0 °C

Absolute maximum temperature: 37.0 °C

Absolute minimum temperature: -5.6 °C

Number of sunny days: 171 days

Number of rainy days: 193 days

Number of snow days: 1 day

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* Weather data for Rock Island United States is based on climate observations for 2026 year

Rock Island air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)21.226.024.928.030.233.234.837.034.230.326.718.7
Average daytime temperature (°C)12.715.916.620.625.728.830.930.328.522.917.113.0
Average temperature (°C)8.010.210.714.619.322.325.024.622.017.010.97.5
Average night temperature (°C)4.46.36.19.614.117.020.420.116.812.16.33.5
Absolute minimum temperature (°C)-4.1-4.6-5.62.75.311.915.614.811.64.3-4.1-4.9

Rock Island monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.013.012.011.010.09.0
Daylight mean duration (h)10.010.912.013.114.114.514.313.512.411.310.39.8
Daylight minimum duration (h)9.010.011.012.013.014.013.012.011.010.09.09.0
Sunshine mean duration (h)5.05.78.18.810.611.010.89.910.68.07.56.4
Precipitation (mm)1351371409310714416017339245489
Sunny days10131814101271316202018
Rainy days201513162118241814111013
Snow days100000000000

Rock Island - weather forecast by months

Rock Island weather in januaryRock Island weather in februaryRock Island weather in marchRock Island weather in aprilRock Island weather in mayRock Island weather in juneRock Island weather in julyRock Island weather in augustRock Island weather in septemberRock Island weather in octoberRock Island weather in novemberRock Island weather in december

Best time to visit Rock Island:

The best time to visit Rock Island during the most sunny months:

  • June — 11.0(h)
  • July — 10.8(h)

The largest precipitation sum in Rock Island is at

  • February — 137(mm)
  • March — 140(mm)
  • June — 144(mm)
  • July — 160(mm)
  • August — 173(mm)

    • Weather forecast in the closest to Rock Island admin centers

    Weather forecast in the closest towns to Rock Island

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    Frequently asked questions

    When is the best time to visit Rock Island?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Rock Island.
    What is the weather like in Rock Island?
    See average temperature, rainfall and daylight hours for Rock Island by month in the table above.
    How many sunny days does Rock Island have?
    The monthly weather statistics above show sunshine and rainfall patterns for Rock Island throughout the year.