St. Lawrence County, NY Weather Forecast
County weather hub
Sunny
Compare major city weather across St. Lawrence County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 84. West wind 3 to 13 mph. New rainfall amounts less than a tenth of an inch possible.
County Weather Overview
This county weather page brings together forecast coverage for St. Lawrence County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 12 of 12 mapped cities in St. Lawrence County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 15 to Jul 19, 2026
- Latest sync
- Jul 13, 2026 9:35 AM EDT
- Forecast office
- BTV
- Source
- NOAA / NWS
Daily Outlook
This Week in St. Lawrence County
Wednesday looks like the warmest upcoming period in St. Lawrence County at 84 degrees F.
Thursday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Wednesday at about 3 to 13 mph W.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 13, 2026 9:35 AM EDT
- Coverage
- 5 days
- Time zone
- America/New_York
- Forecast office
- BTV
- Radar station
- KTYX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 61. West wind 2 to 9 mph.
A chance of rain showers after 2pm. Mostly sunny, with a high near 79. West wind 2 to 13 mph. Chance of precipitation is 30%.
A chance of rain showers before 8pm. Partly cloudy, with a low around 55. Northwest wind 1 to 9 mph. Chance of precipitation is 30%.
Sunny, with a high near 76. Northwest wind 1 to 6 mph.
A chance of showers and thunderstorms after 8pm. Partly cloudy, with a low around 57. West wind 1 to 5 mph. Chance of precipitation is 30%.
A slight chance of rain showers before 2pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 78. Southwest wind around 6 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Southwest wind around 5 mph. Chance of precipitation is 50%.
A chance of rain showers. Partly sunny, with a high near 79. Southwest wind 3 to 7 mph. Chance of precipitation is 50%.
A chance of rain showers before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Southwest wind around 6 mph. Chance of precipitation is 50%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jul 15
|
Sunny
|
84°F |
3 to 13 mph
W
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
61°F |
2 to 9 mph
W
|
|
Thursday
Jul 16
|
Mostly Sunny then Chance Rain Showers
|
79°F |
2 to 13 mph
W
|
|
Thursday Night
Jul 16
|
Chance Rain Showers then Partly Cloudy
|
55°F |
1 to 9 mph
NW
|
|
Friday
Jul 17
|
Sunny
|
76°F |
1 to 6 mph
NW
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms
|
57°F |
1 to 5 mph
W
|
|
Saturday
Jul 18
|
Chance Showers And Thunderstorms
|
78°F |
6 mph
SW
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
59°F |
5 mph
SW
|
|
Sunday
Jul 19
|
Chance Rain Showers
|
79°F |
3 to 7 mph
SW
|
|
Sunday Night
Jul 19
|
Chance Showers And Thunderstorms
|
60°F |
6 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across St. Lawrence County.
Coverage
Forecast coverage currently spans 12 of 12 mapped cities in St. Lawrence County.
Largest mapped city population in this region: 10,388.
