Rock Island Lighthouse Weather Forecast

    • 58
    • 83

    Chance Rain Showers

    • 61
    • 80

    Mostly Sunny

    • 52
    • 80

    Rain Showers

    • 52
    • 69

    Partly Sunny

    • 52
    • 70

    Partly Sunny

    • 57
    • 75

    Chance Rain Showers

Today 12 Jun Jefferson

Some patchy fog in the Morning, otherwise a chance of Showers in the Morning, then Showers likely in the afternoon. Humid with Highs Ranging from around 80 on the tug hill to the mid 80s across the lower Elevations. Light Winds, becoming southwest 10 to 15 Mph. Chance of rain 70 percent.

Tonight 12 Jun Jefferson

Mostly cloudy with some patchy fog. Warm with Lows in the upper 60s. Southwest Winds 10 Mph or less.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Island Lighthouse Temperature Statistics

June Temperature

Watertown, Watertown International Airport (19.9 miles)

  • Lowest 2 June, 2026

    36.6 °F

  • Average June

    62.8 °F

  • Highest 9 June, 2026

    82 °F

Climate (2021–Present)

Watertown, Watertown International Airport (19.9 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    48.2 °F

  • Average High 2021–2026

    57.5 °F
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