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First Sister Lake, MI 7-Day Night Weather Forecast
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First Sister Lake, MI Weather Forecast
First Sister Lake, MI Weather Forecast Date: 334 AM EDT Mon Aug 31 2026
The area/counties/county of: Washtenaw, including the city of Ann Arbor.or toggle through each period.
Today... Mostly cloudy until late afternoon, then becoming partly cloudy. A chance of showers and a slight chance of thunderstorms in the morning, then a chance of showers early in the afternoon. Highs in the mid 80s. Southwest winds 5 to 15 mph. Chance of rain 40%. Heat index readings heat index values up to 90.
Tonight... Partly cloudy. Lows in the lower 70s. Southwest winds 5 to 10 mph.
Tuesday... Mostly sunny. Highs around 90. West winds 5 to 10 mph. Heat index readings in the upper 90s.
Tuesday Night... Partly cloudy. Lows in the lower 70s. West winds 5 to 10 mph.
Wednesday... Mostly sunny in the morning, then becoming partly cloudy. Highs in the lower 90s. Southwest winds 5 to 15 mph. Heat index readings in the upper 90s.
Wednesday Night... Partly cloudy. Showers likely and a chance of thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 60%.
Thursday... Partly cloudy. A chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 30%.
Thursday Night... Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 60s.
Friday... Partly cloudy. Highs in the lower 80s.
Friday Night... Partly cloudy in the evening then clearing. Lows in the lower 60s.
Saturday... Mostly sunny. Highs in the lower 80s.
Saturday Night... Mostly clear. Lows around 60.
POP = Probability of Precipitation
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