First Sister Lake Weather Forecast

    • 61
    • 86

    Chance Rain Showers

    • 67
    • 87

    Chance Rain Showers

    • 72
    • 91

    Mostly Sunny

    • 65
    • 90

    Chance Thunderstorms

    • 61
    • 83

    Slight Chance Thunderstorms

    • 63
    • 83

    Partly Sunny

Today 3 Jul Washtenaw

Mostly sunny. Isolated Showers early in the afternoon. Isolated Showers and Thunderstorms early in the evening. Highs in the mid 80s. Northwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 3 Jul Washtenaw

Partly cloudy early in the evening then clearing. A chance of Showers early in the evening. Lows in the lower 60s. North Winds up to 5 Mph, becoming east. Chance of rain 30 percent.

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First Sister Lake Temperature Statistics

July Temperature

Ann Arbor, Ann Arbor Municipal Airport (4.3 miles)

  • Lowest 1 July, 2025

    64.9 °F

  • Average July

    75.8 °F

  • Highest 1 July, 2025

    82.9 °F

Climate (2020–Present)

Ann Arbor, Ann Arbor Municipal Airport (4.3 miles)

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  • Average Low 2020–2025

    39.4 °F

  • Average 2020–2025

    49.8 °F

  • Average High 2020–2025

    60.1 °F
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