St. Lawrence County, NY Weather Forecast
County weather hub
Partly Sunny then Chance Showers And Thunderstorms
Compare major city weather across St. Lawrence County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 68. West wind 6 to 9 mph. Chance of precipitation is 40%. 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
- May 31 to Jun 4, 2026
- Latest sync
- May 29, 2026 1:58 PM EDT
- Forecast office
- BTV
- Source
- NOAA / NWS
Daily Outlook
This Week in St. Lawrence County
Thursday looks like the warmest upcoming period in St. Lawrence County at 75 degrees F.
Sunday Night is the coolest period ahead with temperatures near 45 degrees F.
The strongest winds are forecast for Sunday at about 6 to 9 mph W.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- May 29, 2026 1:58 PM 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
A chance of showers and thunderstorms. Mostly cloudy, with a low around 45. Southwest wind 2 to 7 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers before 2pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 66. Northwest wind 2 to 8 mph. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 46. Northeast wind 1 to 5 mph.
A chance of rain showers after 8am. Mostly sunny, with a high near 68. North wind 1 to 9 mph. Chance of precipitation is 30%.
A chance of rain showers before 8pm. Partly cloudy, with a low around 47. Northeast wind 2 to 6 mph. Chance of precipitation is 30%.
Mostly sunny, with a high near 69. Northeast wind 3 to 8 mph.
Partly cloudy, with a low around 50. Southeast wind around 5 mph.
Mostly sunny, with a high near 75. West wind 3 to 8 mph.
Partly cloudy, with a low around 55. Southwest wind around 6 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
May 31
|
Partly Sunny then Chance Showers And Thunderstorms
|
68°F |
6 to 9 mph
W
|
|
Sunday Night
May 31
|
Chance Showers And Thunderstorms
|
45°F |
2 to 7 mph
SW
|
|
Monday
Jun 1
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
66°F |
2 to 8 mph
NW
|
|
Monday Night
Jun 1
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
46°F |
1 to 5 mph
NE
|
|
Tuesday
Jun 2
|
Chance Rain Showers
|
68°F |
1 to 9 mph
N
|
|
Tuesday Night
Jun 2
|
Chance Rain Showers then Partly Cloudy
|
47°F |
2 to 6 mph
NE
|
|
Wednesday
Jun 3
|
Mostly Sunny
|
69°F |
3 to 8 mph
NE
|
|
Wednesday Night
Jun 3
|
Partly Cloudy
|
50°F |
5 mph
SE
|
|
Thursday
Jun 4
|
Mostly Sunny
|
75°F |
3 to 8 mph
W
|
|
Thursday Night
Jun 4
|
Partly Cloudy
|
55°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.
