Foster Weather Forecast

    • 54
    • 89

    Sunny

    • 52
    • 79

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 52
    • 77

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 53
    • 74

    Slight Chance Rain

Today 16 Sep Cascade Foothills of Marion and Linn Counties

Sunny. Highs in the upper 80s. Southeast wind 10 to 15 Mph, becoming light this afternoon.

Tonight 16 Sep Cascade Foothills of Marion and Linn Counties

Clear. Lows in the mid 50s. Winds light.

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Foster Temperature Statistics

September Temperature

Corvallis, Corvallis Municipal Airport (31.7 miles)

  • Lowest 13 September, 2025

    46 °F

  • Average September

    65.9 °F

  • Highest 4 September, 2025

    93 °F

Climate (2020–Present)

Corvallis, Corvallis Municipal Airport (31.7 miles)

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  • Average Low 2020–2025

    43.4 °F

  • Average 2020–2025

    53 °F

  • Average High 2020–2025

    63.9 °F
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