Gartside Reservoir Weather Forecast

    • 20
    • 34

    Chance Freezing Rain

    • 10
    • 40

    Chance Freezing Rain

    • 17
    • 36

    Mostly Cloudy

    • 19
    • 36

    Partly Sunny

    • 12
    • 30

    Slight Chance Snow

    • 9
    • 30

    Slight Chance Snow

    • 10
    • 25

    Mostly Sunny

Today 21 Dec Richland

Mostly sunny late this Morning, then becoming mostly cloudy. Warmer with Highs in the lower 30s. South wind 10 to 15 Mph.

Tonight 21 Dec Richland

Mostly cloudy. A chance of freezing rain and snow after midnight. Lows around 20. South wind around 5 Mph, becoming east after midnight. Chance of precipitation 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Gartside Reservoir Temperature Statistics

December Temperature

Sidney-Richland (8.7 miles)

  • Lowest 13 December, 2025

    -11 °F

  • Average December

    16.3 °F

  • Highest 19 December, 2025

    48 °F

Climate (2020–Present)

Sidney-Richland (8.7 miles)

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  • Average Low 2020–2025

    31.9 °F

  • Average 2020–2025

    43.9 °F

  • Average High 2020–2025

    56.1 °F
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