St. Clair- Including the city of Port Huron 347 AM EDT Sat Jul 27 2024 .TODAY...Mostly sunny. Highs in the lower 80s. Southeast winds up to 5 mph. .TONIGHT...Mostly clear. Lows in the upper 50s. South winds up to 5 mph. .SUNDAY...Mostly sunny. Highs in the mid 80s. South winds up to 10 mph. .SUNDAY NIGHT...Partly cloudy. Lows in the mid 60s. South winds up to 5 mph. .MONDAY...Partly cloudy with a chance of showers and thunderstorms. Highs in the mid 80s. South winds up to 10 mph. Chance of rain 50 percent. .MONDAY NIGHT...Partly cloudy with a chance of showers. A chance of thunderstorms. Lows in the upper 60s. Chance of rain 40 percent. .TUESDAY...Mostly cloudy. A chance of showers and a slight chance of thunderstorms in the morning, then showers likely and a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 70 percent. .TUESDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 50 percent. .WEDNESDAY...Partly cloudy in the morning then clearing. A chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 40 percent. .WEDNESDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 60s. .THURSDAY...Partly cloudy with a chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 30 percent. Heat index readings heat index values up to 90. .THURSDAY NIGHT...Partly cloudy with a chance of showers. A chance of thunderstorms. Lows in the upper 60s. Chance of rain 30 percent. .FRIDAY...Partly cloudy with a chance of showers. Highs in the mid 80s. Chance of rain 40 percent. $$