St. Lawrence River Weather Forecast
St. Lawrence River weather: 37°F, clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Summary
St. Lawrence River is a river in Quebec. St. Lawrence River is a river known as the Great Lakes outlet to the Atlantic.
Right now it is 37°F (3°C) in St. Lawrence River with clear. It feels like 31°F. Today runs from 27°F to 51°F. Chance of precipitation is 0%. Sightseeing conditions score 7.6/10 - good conditions.
The best time to visit St. Lawrence River is September. The climate is subarctic. January, March and December tend to be the least comfortable months. July is the warmest month with average highs near 78°F, while February is the coldest with lows near 4°F.
The closest major airport is Montreal-Trudeau International Airport (YUL), about 153 mi away. Nearby highlights include Baxter State Park, Mont-Tremblant National Park, Mount Washington and Franconia Notch State Park.
In plain terms. Today is slightly cooler than average for October. The forecast high of 51°F is 5.9°F below the 57°F typical for this month. The best window to be outside is roughly 2 PM to 5 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in St. Lawrence River today at 10/10. Overnight lows near 27°F mean ice is possible on bridges before dawn.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Active alerts for St. Lawrence River
Derived from the forecast. No official alert feed is wired for this country yet.
Weather in St. Lawrence River right now
Source: Open-Meteo. Updated 7:27 PM, Oct 25 local time.
Next 24 hours
Hour-by-hour temperature, precipitation chance and wind.
16-day forecast for St. Lawrence River
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Sat, Oct 24 | ☁️ Overcast | 51° / 27° | 0% | 8 mph | 3 |
| Sun, Oct 25 | ☁️ Overcast | 54° / 32° | 4% | 10 mph | 3 |
| Mon, Oct 26 | 🌦️ Light drizzle | 54° / 39° | 37% · 0,0 in | 13 mph | 3 |
| Tue, Oct 27 | ☀️ Clear sky | 45° / 33° | 0% | 9 mph | 3 |
| Wed, Oct 28 | ☁️ Overcast | 47° / 33° | 0% | 8 mph | 3 |
| Thu, Oct 29 | 🌦️ Light drizzle | 55° / 36° | 41% · 0,0 in | 10 mph | 3 |
| Fri, Oct 30 | ☁️ Overcast | 52° / 40° | 40% | 9 mph | 2 |
| Sat, Oct 31 | ☁️ Overcast | 49° / 35° | 11% | 5 mph | 3 |
| Sun, Nov 1 | 🌦️ Light drizzle | 48° / 44° | 41% · 0,1 in | 3 mph | 0 |
| Mon, Nov 2 | 🌧️ Rain | 57° / 48° | 43% · 1,1 in | 7 mph | 0 |
| Tue, Nov 3 | 🌦️ Light drizzle | 54° / 39° | 38% · 0,0 in | 14 mph | 3 |
| Wed, Nov 4 | ☁️ Overcast | 47° / 34° | 29% | 8 mph | 3 |
| Thu, Nov 5 | 🌦️ Light rain | 46° / 39° | 23% · 0,6 in | 9 mph | 0 |
| Fri, Nov 6 | ☁️ Overcast | 45° / 38° | 21% | 12 mph | 2 |
| Sat, Nov 7 | 🌥️ Fog | 42° / 31° | 29% | 11 mph | 2 |
| Sun, Nov 8 | 🌧️ Rain | 41° / 37° | 26% · 1,0 in | 16 mph | 0 |
Climate in St. Lawrence River month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 21° | 5° | 2,7 in | ★★☆☆☆ |
| February | 24° | 4° | 2,0 in | ★★☆☆☆ |
| March | 34° | 17° | 4,1 in | ★★☆☆☆ |
| April | 49° | 30° | 4,9 in | ★★☆☆☆ |
| May | 62° | 44° | 5,0 in | ★★★☆☆ |
| June | 73° | 54° | 6,9 in | ★★★☆☆ |
| July | 78° | 61° | 5,1 in | ★★★★☆ |
| August | 75° | 57° | 6,5 in | ★★★☆☆ |
| September | 68° | 50° | 1,8 in | ★★★★☆ |
| October | 57° | 42° | 3,5 in | ★★★☆☆ |
| November | 38° | 27° | 3,5 in | ★★☆☆☆ |
| December | 26° | 11° | 3,8 in | ★☆☆☆☆ |
Climate type: Subarctic. Source: Open-Meteo archive (ERA5).
Weather map for St. Lawrence River
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Air quality and pollen in St. Lawrence River
Air quality: Open-Meteo (CAMS). US AQI scale.
Sun, twilight and moon
Golden and blue hour are the standard photographic approximation around sunrise and sunset.
Best time to visit St. Lawrence River
Go in September. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, March and December - expect the least comfortable mix of heat, cold or rain.
Explore St. Lawrence River
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is St. Lawrence River?
St. Lawrence River is a river in Quebec. Its coordinates are 46.8139, -71.208. It lies in North America.
What is the weather like in St. Lawrence River right now?
It is currently 37°F (3°C) with clear. Humidity is 80% and wind is 5 mph.
When is the best time to visit St. Lawrence River?
September offer the most comfortable conditions in St. Lawrence River, which has a subarctic climate. January, March and December are usually the hardest months for outdoor plans.
What time zone is St. Lawrence River in?
St. Lawrence River observes America/Toronto (UTC-04:00). The local time is 7:27 PM.
What is the nearest airport to St. Lawrence River?
The closest airports are Montreal-Trudeau International Airport (YUL), 153 mi away and Boston Logan International Airport (BOS), 308 mi away.
What are the top things to do in St. Lawrence River?
Popular options include Baxter State Park, Mont-Tremblant National Park, Mount Washington, Franconia Notch State Park and Acadia National Park.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (rivers) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated October 25, 2026 at 7:27 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
