Greenhorn Reservoir Weather Forecast

    • 36
    • 64

    Sunny

    • 40
    • 73

    Mostly Sunny

    • 45
    • 78

    Mostly Sunny

    • 48
    • 83

    Sunny

    • 49
    • 86

    Sunny

    • 51
    • 87

    Sunny

    • 50
    • 86

    Mostly Sunny

Today 17 May Central Siskiyou County

Sunny. Highs in the mid 50s to mid 60s. Breezy. Winds north Winds 20 to 30 Mph. Gusts up to 35 Mph increasing to 45 Mph this afternoon.

Tonight 17 May Central Siskiyou County

Clear. Lows in the lower to mid 30s. Breezy. North Winds 15 to 25 Mph with Gusts to around 45 Mph decreasing to 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Greenhorn Reservoir Temperature Statistics

May Temperature

Montague Siskiyou County Airport (9.9 miles)

  • Lowest 14 May, 2026

    34.6 °F

  • Average May

    61.8 °F

  • Highest 12 May, 2026

    89.7 °F

Climate (2021–Present)

Montague Siskiyou County Airport (9.9 miles)

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  • Average Low 2021–2026

    39.6 °F

  • Average 2021–2026

    54.3 °F

  • Average High 2021–2026

    69.2 °F
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