Sunday, October 18, 2026 | St. Lawrence County, NY
The week will start out with several days of wet weather as a slow moving frontal boundary crosses the St. Lawrence Valley, according to the National Weather Service (NWS). Periods of showers and …
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The week will start out with several days of wet weather as a slow moving frontal boundary crosses the St. Lawrence Valley, according to the National Weather Service (NWS).
Periods of showers and thunderstorms, some potentially containing locally heavy rainfall, are expected through Monday, with lighter showers lingering into midweek, forecasters say.
Thunderstorms are likely today after 11 a.m. with a high near 72, NWS says. Overnight the low will be around 56.
A sharp cold front will move through on Thursday, bringing more rain, gusty winds, and cooler temperatures to close out the week, NWS says.
The forecast through next Saturday is as follows:
Monday
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 67. Northeast wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Monday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 1am, then a chance of showers after 1am. Low around 56. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Mostly cloudy, with a high near 69. West wind 5 to 7 mph.
Tuesday Night
Mostly cloudy, with a low around 55. Light and variable wind.
Wednesday
Showers likely, mainly after 2pm. Partly sunny, with a high near 75. South wind 6 to 9 mph. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 52. South wind around 10 mph becoming northwest after midnight. Chance of precipitation is 60%.
Thursday
A 40 percent chance of showers. Partly sunny, with a high near 60. Northwest wind 7 to 9 mph.
Thursday Night
Mostly cloudy, with a low around 43. West wind 5 to 7 mph.
Friday
Partly sunny, with a high near 55. Northwest wind 9 to 14 mph.
Friday Night
Partly cloudy, with a low around 39. Southwest wind 5 to 7 mph.
Saturday
Mostly sunny, with a high near 59. West wind 5 to 8 mph.
