A deepening trough of low pressure will bring periods of valley rain and higher elevation snowfall to the St. Lawrence Valley through Wednesday, along with unseasonably cool temperatures, according to the National Weather Service (NWS).

High temps today will be around 44 with winds 8-11 mph, the service says. Overnight the low will be around d 34.

High pressure, sunnier skies and much warmer temperatures return for the end of the week and through the weekend, NWS says.

The extended forecast through next weekend:

Wednesday

A slight chance of rain and snow showers before 9am, then a slight chance of rain showers between 9am and 1pm. Mostly cloudy, with a high near 46. Northwest wind around 9 mph. Chance of precipitation is 20%.

Wednesday Night

Areas of frost after 3am. Otherwise, mostly cloudy, with a low around 30. Southwest wind 3 to 6 mph.

Thursday

Areas of frost before 9am. Otherwise, sunny, with a high near 55. Southwest wind 3 to 7 mph.

Thursday Night

Mostly clear, with a low around 35. South wind around 6 mph.

Friday

Sunny, with a high near 61. South wind around 5 mph becoming west in the afternoon.

Friday Night

Clear, with a low around 38. South wind around 5 mph.

Saturday

Sunny, with a high near 65. Southwest wind 5 to 9 mph.

Saturday Night

Mostly clear, with a low around 43. Southwest wind around 7 mph.

Sunday

Mostly sunny, with a high near 63. South wind 7 to 13 mph.

Sunday Night

Partly cloudy, with a low around 47. Southwest wind 8 to 13 mph.

Monday

Sunny, with a high near 67. South wind around 6 mph.