A warm and fairly muggy day is expected as students begin their first day of school today, as a band of rainfall moves across central St. Lawrence County at this hour.

There is a chance of rain and maybe some thunderstorms this afternoon across the St. Lawrence Valley and northern Adirondacks before skies clear for tonight and tomorrow, according to the National Weather Service forecast. If there are thunderstorms, they are expected to be few in number and isolated.

The rain is expected to dissipate during the evening hours as it moves east.

Generally fair conditions are expected tonight and Friday. Temperatures will remain warm Friday but with lower humidity levels.

Meanwhile a slow-moving cold front will bring widespread rain to the North Country on Saturday, the NWS predicts.

You can find more details and forecasts for places all around the county from our weather page.

The NWS forecast for the St. Lawrence Valley and northwestern Adirondacks:

Today: A chance of showers and thunderstorms, mainly after noon. Mostly sunny, with a high near 83. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: Mostly clear, with a low around 52. Southwest wind around 6 mph.

Friday: Sunny, with a high near 81. Light south wind becoming southwest 5 to 10 mph in the morning.

Friday Night: A chance of rain, mainly after 5am. Mostly cloudy, with a low around 64. East wind 5 to 11 mph becoming south after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Rain likely, mainly after 8am. Cloudy, with a high near 73. South wind 8 to 11 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

Saturday Night: A chance of showers. Cloudy, with a low around 52. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

Sunday: A chance of showers. Partly sunny, with a high near 69. Chance of precipitation is 30%.

Sunday Night: A slight chance of showers. Mostly cloudy, with a low around 46.

Monday: Mostly sunny, with a high near 66.

Monday Night: Mostly clear, with a low around 45.

Tuesday Sunny, with a high near 68.

Tuesday Night: Mostly clear, with a low around 48.

Wednesday: Mostly sunny, with a high near 73.