Portland Weather Forecast

    • 53
    • 74

    Slight Chance Rain Showers

    • 54
    • 73

    Chance Rain Showers

    • 57
    • 65

    Rain Showers

    • 50
    • 67

    Slight Chance Rain Showers

    • 48
    • 63

    Chance Rain Showers

    • 52
    • 67

    Mostly Cloudy

Today 17 Sep Ionia

Partly sunny. Highs in the upper 60s.

Tonight 17 Sep Ionia

Mostly cloudy in the evening then becoming partly cloudy. Lows in the lower 50s. Northeast Winds around 5 Mph.

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Portland Temperature Statistics

September Temperature

Ionia County Airport (9.3 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    68.8 °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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