Portland Weather Forecast

    • 57
    • 72

    Slight Chance Thunderstorms

    • 58
    • 81

    Chance Rain Showers

    • 61
    • 74

    Rain Showers Likely

    • 57
    • 77

    Slight Chance Rain Showers

    • 59
    • 76

    Rain Showers Likely

    • 55
    • 73

    Rain Showers Likely

Today 14 Sep Ionia

Sunny. Highs in the lower 70s. Light Winds.

Tonight 14 Sep Ionia

Partly cloudy in the Evening, then mostly cloudy with a 20 percent chance of Showers and Thunderstorms after midnight. Lows in the upper 50s. Southeast Winds 5 to 15 Mph with Gusts to around 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Portland Temperature Statistics

September Temperature

Ionia County Airport (9.3 miles)

  • Lowest 11 September, 2026

    48.2 °F

  • Average September

    70.5 °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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