The National Weather Service is calling for high temperatures through the week, possibly hitting 90, and clear skies through Tuesday.

Today will be sunny with temperatures in the mid 80s, reaching a high of 89 in Ogdensburg. Temperatures should be a few degrees cooler in high elevations, the NWS said.

Tonight, thermometers should drop to the mid or high 60s, getting to a low of 62 in Star Lake.

Monday's temperatures are forecast to get as high as 90 in Ogdensburg. Clouds are expected to roll in by night, with temperatures returning to the high 60s in most areas.

Meteorologists say Tuesday will bring a 40 percent chance of showers with temperatures in the high 80s. Rain should go away by night, bringing cloudy skies and temperatures back in the high 60s.

All areas of St. Lawrence County are looking at a 30 percent chance of showers and thundershowers on Wednesday. Those odds are expected to hold through the p.m. hours. Daytime temperatures are forecast in the high 80s and around 70 at night.

The extended forecast for Potsdam:

Today - Sunny, with a high near 88. Heat index values as high as 92. Southwest wind 6 to 8 mph.

Tonight - Partly cloudy, with a low around 68. Southwest wind around 8 mph.

Monday - Sunny, with a high near 89. Heat index values as high as 94. Southwest wind 8 to 13 mph.

Monday night - Partly cloudy, with a low around 70. Southwest wind 6 to 9 mph.

Tuesday - A 40 percent chance of showers. Mostly sunny, with a high near 87. Southwest wind 3 to 8 mph. New precipitation amounts of less than a tenth of an inch possible.

Tuesday night - Mostly cloudy, with a low around 69. Light south wind.

Wednesday - A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 88. South wind 3 to 7 mph. Chance of precipitation is 30%.

Wednesday night - A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. South wind around 7 mph. Chance of precipitation is 30%.

Thursday - A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 83. South wind around 9 mph. Chance of precipitation is 50%.

Thursday night - A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South wind 5 to 7 mph.

Friday - Partly sunny, with a high near 78. Southwest wind around 6 mph.

Friday night - Partly cloudy, with a low around 61. Light south wind.

Saturday - Mostly sunny, with a high near 80. Light and variable wind.