Summer weather keeps on coming in St. Lawrence County.

High temperatures all week are expected to reach into the mid-80s, and thunderstorms are expected Tuesday and Wednesday, according to the National Weather Service.

Outside of an isolated late day shower or storm in the mountains,

high pressure will continue to provide generally dry and warm conditions in the St. Lawrence Valley today into tonight, according to the National Weather Service.

Today is likely to be the warmest day of the week, with high approaching 90. Wednesday and Thursday are expected to be the cool days this week, relatively speaking, with highs reaching only the low 80s.

A slowly approaching and weak upper trough will bring more of a threat of showers and storms to northern New York by later Tuesday and across the broader region on Wednesday.

There is a 30 percent chance of showers Tuesday, rising to about 60 percent Wednesday, before it drops off again to 30 or 40 percent for the rest of the week.

Slight chances of scattered afternoon showers and storms continue through late into the week and into next weekend as the Northeast remains in a seasonably warm and humid air mass.

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

This Afternoon: Sunny, with a high near 89. Southwest wind around 8 mph.

Tonight: Mostly clear, with a low around 65. Southwest wind around 5 mph becoming calm in the evening.

Tuesday: A chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 84. South wind 6 to 13 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday: Showers and thunderstorms likely, mainly after 2pm. Mostly cloudy, with a high near 81. West wind 5 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: Showers and thunderstorms likely before midnight, then a chance of showers. Mostly cloudy, with a low around 62. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers. Mostly sunny, with a high near 81. Chance of precipitation is 30%.

Thursday Night: A slight chance of showers. Partly cloudy, with a low around 60.

Friday: A chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 40%.

Friday Night: A chance of showers. Partly cloudy, with a low around 64. Chance of precipitation is 30%.

Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 30%.

Saturday Night: A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.

Sunday A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 40%.