Slightly cooler weather is expected today across the St. Lawrence Valley with possible snow showers developing late this afternoon and tonight in the Adirondacks, according to the National Weather Service (NWS).

The greatest snowfall accumulation will be in the vicinity of Route 3 from Saranac Lake westward, NWS says. Elsewhere, scattered snow showers move across Sunday morning with perhaps a brief localized snow squall.

It will be breezy tonight and breezy and much colder Sunday, forecasters say.

The extended forecast through Friday is as follows:

Sunday

A chance of snow showers before 2pm, then a slight chance of snow showers after 5pm. Mostly cloudy, with a high near 27. West wind around 17 mph, with gusts as high as 32 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.

Sunday Night

Mostly cloudy, with a low around 21. Southwest wind 13 to 16 mph.

Monday

Partly sunny, with a high near 39. Breezy, with a southwest wind 16 to 21 mph, with gusts as high as 31 mph.

Monday Night

Mostly cloudy, with a low around 29. Southwest wind 13 to 16 mph.

Tuesday

Mostly cloudy, with a high near 41. West wind around 14 mph.

Tuesday Night

Mostly cloudy, with a low around 27. Calm wind.

Wednesday

A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 47. East wind around 7 mph.

Wednesday Night

Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 34. South wind 9 to 11 mph. Chance of precipitation is 60%.

Thursday

A chance of rain and snow showers. Mostly cloudy, with a high near 46. Southwest wind around 11 mph. Chance of precipitation is 40%.

Thursday Night

A chance of rain and snow showers. Mostly cloudy, with a low around 30. West wind 5 to 8 mph. Chance of precipitation is 40%.

Friday

Rain and snow showers likely. Mostly cloudy, with a high near 47. Northwest wind 6 to 10 mph. Chance of precipitation is 60%.