Sullivan Weather Forecast

    • 50
    • 70

    Chance Rain Showers

    • 46
    • 65

    Mostly Cloudy

    • 46
    • 64

    Mostly Cloudy

    • 46
    • 65

    Chance Rain Showers

    • 46
    • 67

    Mostly Cloudy

    • 45
    • 68

    Partly Sunny

Today 20 Sep Muskegon

Mostly cloudy. A 50 percent chance of rain in the morning. Patchy fog in the morning. Highs around 70. Northeast Winds 5 to 15 Mph with Gusts to around 25 Mph.

Tonight 20 Sep Muskegon

Partly cloudy. Lows around 50. Northeast Winds 5 to 15 Mph with Gusts to around 25 Mph.

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  • Temperature Real-Time

Sullivan Temperature Statistics

September Temperature

Muskegon, Muskegon County Airport (9.3 miles)

  • Lowest 14 September, 2026

    46.7 °F

  • Average September

    69.1 °F

  • Highest 2 September, 2026

    85.6 °F

Climate (2021–2026)

Muskegon, Muskegon County Airport (9.3 miles)

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  • Average Low 2021–2026

    43.2 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    60 °F
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