A break in the heat in the North Country could be on the way.

Warm and muggy conditions tonight into Thursday morning in St. Lawrence County will give way to a slow moving cold front later tomorrow into Friday, the National Weather Service predicts.

The front will bring rainfall to the region tomorrow afternoon into tomorrow night, along with cooler more seasonal temperatures. Some of the rain could be heavy at times.

A few isolated thunderstorms could pop up this afternoon and tonight. Lows tonight will be in the mid to upper 60s.

Clouds will thicken tomorrow, with an increasing chance of showers or thunderstorms and then scattered showers in the afternoon into the evening. Occasional showers, possibly heavy, are expected tomorrow night. Highs tomorrow are expected to be in the mid 80s, and lows tomorrow night should be in the low 60s.

The outlook for Friday is for showers early before the sky clears out for partly sunny skies and highs in the mid 70s.

For up-to-date forecasts for your community, visit the NorthCountryNow.com Weather Page.

The National Weather Service forecast for the St. Lawrence valley and northwestern Adirondacks:

Tonight: Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 67. South wind 6 to 8 mph. Chance of precipitation is 20%.

Thursday: Scattered showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 84. South wind 10 to 15 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Occasional showers. The rain could be heavy at times. Low around 62. South wind 7 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

Friday: Showers likely, mainly before 9am. The rain could be heavy at times. Partly sunny, with a high near 76. Southwest wind 7 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night: Partly cloudy, with a low around 58. Southwest wind 5 to 7 mph becoming calm after midnight.

Saturday: Mostly sunny, with a high near 78. Light and variable wind.

Saturday Night: Partly cloudy, with a low around 61. North wind around 5 mph becoming calm in the evening.

Sunday: Mostly sunny, with a high near 81. Calm wind.

Sunday Night: A 30 percent chance of showers after 9pm. Partly cloudy, with a low around 64. Light and variable wind.

Monday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind 5 to 9 mph.

Monday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Southwest wind 5 to 7 mph.

Tuesday: A 30 percent chance of showers. Mostly sunny, with a high near 75. Southwest wind 6 to 11 mph.

Tuesday Night: Partly cloudy, with a low around 57. West wind 5 to 7 mph.

Wednesday: A 30 percent chance of showers. Mostly sunny, with a high near 74. Southwest wind 7 to 10 mph.