High pressure will provide pleasant weather conditions through Friday across the St. Lawrence Valley, according to the National Weather Service (NWS).

Morning valley fog will dissipate quickly after sunrise and temperatures this afternoon will reach the low to mid 70s under mostly sunny skies, NWS says.

An overnight low around 53 is expected, the service says.

Temperatures will be slightly cooler on Thursday and Friday - with highs mainly in the 60s - as a dry cold front crosses the region from north to south, forecasters say.

Rain is expected to develop Saturday and Saturday night as low pressure lifts northeastward from the Ohio Valley into New York, the service says.

The forecast through early next week is as follows:

Thursday

Mostly sunny, with a high near 66. North wind around 8 mph.

Thursday Night

Mostly clear, with a low around 43. North wind around 6 mph.

Friday

Sunny, with a high near 67. Northeast wind 11 to 13 mph.

Friday Night

Partly cloudy, with a low around 47. East wind around 6 mph.

Saturday

A 50 percent chance of showers. Mostly cloudy, with a high near 67. Southeast wind around 6 mph.

Saturday Night

A 50 percent chance of showers. Cloudy, with a low around 54. South wind 5 to 7 mph.

Sunday

A 40 percent chance of showers. Mostly cloudy, with a high near 70. West wind 5 to 7 mph.

Sunday Night

A 30 percent chance of showers. Mostly cloudy, with a low around 51. West wind 3 to 5 mph.

Monday

A 30 percent chance of showers. Mostly sunny, with a high near 71. West wind 5 to 8 mph.

Monday Night

Partly cloudy, with a low around 48. West wind around 6 mph becoming light and variable after midnight.

Tuesday

Mostly sunny, with a high near 70. East wind around 6 mph becoming northwest in the afternoon.