Portland Weather Forecast

    • 44
    • 70

    Mostly Sunny

    • 48
    • 73

    Mostly Sunny

    • 49
    • 74

    Mostly Sunny

    • 56
    • 75

    Chance Rain Showers

    • 58
    • 71

    Chance Rain Showers

    • 54
    • 72

    Chance Rain Showers

    • 48
    • 67

    Chance Rain Showers

Today 26 Sep Ionia

Mostly sunny with a 20 percent chance of rain Showers. Highs in the mid 60s.

Tonight 26 Sep Ionia

Clear. Lows in the mid 40s. Light Winds.

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Portland Temperature Statistics

September Temperature

Ionia County Airport (9.3 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    65 °F

  • Highest 2 September, 2026

    93.2 °F

Climate (2021–2026)

Ionia County Airport (9.3 miles)

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  • Average Low 2021–2026

    40.9 °F

  • Average 2021–2026

    50 °F

  • Average High 2021–2026

    59 °F
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