Mertz Reservoir Weather Forecast

    • 49
    • 72

    Mostly Sunny

    • 55
    • 77

    Partly Sunny

    • 57
    • 81

    Partly Sunny

    • 56
    • 80

    Partly Sunny

    • 49
    • 73

    Chance Rain Showers

    • 51
    • 77

    Mostly Sunny

Today 18 Sep Central Laramie Range and Southwest Platte County

Patchy fog this morning. Sunny, warmer with Highs in the upper 60s. Northwest Winds 5 to 10 Mph.

Tonight 18 Sep Central Laramie Range and Southwest Platte County

Mostly clear. Lows in the upper 40s. Southeast Winds 5 to 10 Mph, becoming southwest with Gusts up to 20 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mertz Reservoir Temperature Statistics

September Temperature

Camp Guernsey (28.6 miles)

  • Lowest 6 September, 2025

    37.2 °F

  • Average September

    66.2 °F

  • Highest 11 September, 2025

    91.8 °F

Climate (2020–Present)

Camp Guernsey (28.6 miles)

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  • Average Low 2020–2025

    35.3 °F

  • Average 2020–2025

    49 °F

  • Average High 2020–2025

    62.5 °F
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