Round Mountain Airport Weather Forecast

    • 46
    • 81

    Slight Chance Rain Showers

    • 42
    • 64

    Becoming Sunny

    • 43
    • 72

    Sunny

    • 41
    • 67

    Mostly Sunny

    • 38
    • 58

    Partly Sunny

    • 40
    • 63

    Sunny

    • 44
    • 70

    Mostly Sunny

Today 12 May Central Siskiyou County

Partly cloudy. Highs in the lower 80s to lower 90s. Breezy. South Winds 20 to 25 Mph in the shasta valley and south 15 to 25 Mph elsewhere.

Tonight 12 May Central Siskiyou County

Mostly cloudy with a 20 percent chance of Thunderstorms this Evening, then mostly clear after midnight. Lows in the mid 40s to lower 50s. Southwest Winds 10 to 15 Mph shifting to the west late this evening and overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Round Mountain Airport Temperature Statistics

May Temperature

Montague Siskiyou County Airport (20.5 miles)

  • Lowest 9 May, 2026

    36.6 °F

  • Average May

    62.4 °F

  • Highest 9 May, 2026

    86.6 °F

Climate (2021–Present)

Montague Siskiyou County Airport (20.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    39.7 °F

  • Average 2021–2026

    54.3 °F

  • Average High 2021–2026

    69.2 °F
Get WillyWeather+ to remove ads