St. Lawrence County forecast: Chance of thunderstorms Fri.-Sat., mostly sunny Sunday
Friday, August 16, 2019 - 1:30 pm

The National Weather Service says there is a chance of thunderstorms in St. Lawrence County Friday and Saturday, but Sunday is likely to be mostly sunny.

Meteorologists are calling a 40 percent chance of thunderstorms Friday during the afternoon and night, with highs around 77 and lows around 63.

On Saturday, there is a 50 percent chance of thunderstorms and then a 70 percent chance of showers, with the night predicted to bring a 60 percent chance of showers and then mostly clear. Highs are forecast around 77 and lows around 64.

Sunday is predicted to bring mostly sunny skies with highs around 82, and a 40 percent chance of nighttime showers with lows around 68.

The detailed forecast for St. Lawrence County:

Friday Afternoon - A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. Calm wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night - A 40 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 63. South wind 3 to 6 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday - A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Southwest wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night - Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 11pm. Partly cloudy, with a low around 64. South wind 3 to 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday - Mostly sunny, with a high near 82. Southwest wind 3 to 6 mph.

Sunday Night - A 40 percent chance of showers. Mostly cloudy, with a low around 68. Calm wind becoming south around 6 mph after midnight. New precipitation amounts of less than a tenth of an inch possible.

Monday - A 40 percent chance of showers. Partly sunny, with a high near 85. Southwest wind 7 to 9 mph.

Monday Night - A 30 percent chance of showers. Partly cloudy, with a low around 65. Southwest wind 3 to 6 mph.

Tuesday - A 30 percent chance of showers. Mostly sunny, with a high near 82. West wind 3 to 5 mph.

Tuesday Night - A 40 percent chance of showers. Partly cloudy, with a low around 64. Light and variable wind.

Wednesday - A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 79. Light and variable wind becoming west around 6 mph in the morning.

Wednesday Night - A 30 percent chance of showers. Partly cloudy, with a low around 57. West wind 3 to 5 mph.

Thursday - Mostly sunny, with a high near 72. Northwest wind 5 to 7 mph.