St. Lawrence River Weather Forecast
St. Lawrence River weather: 62°F, partly cloudy. 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 62°F (17°C) in St. Lawrence River with partly cloudy. It feels like 63°F. Today runs from 62°F to 65°F. Chance of precipitation is 43%. Sightseeing conditions score 8.6/10 - excellent - go now.
The best time to visit St. Lawrence River is July and 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 cooler than average for August. The forecast high of 65°F is 9.5°F below the 75°F typical for this month. The best window to be outside is roughly 11 AM to 2 PM, when temperature, rain chance and wind line up best. fishing is the strongest bet in St. Lawrence River today at 9.4/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Weather in St. Lawrence River right now
Source: Open-Meteo. Updated 6:20 PM, Aug 24 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 |
|---|---|---|---|---|---|
| Sun, Aug 23 | 🌧️ Rain | 65° / 62° | 43% · 0,4 in | 15 mph | 2 |
| Mon, Aug 24 | 🌧️ Rain | 74° / 59° | 34% · 0,4 in | 14 mph | 6 |
| Tue, Aug 25 | 🌧️ Rain | 67° / 56° | 27% · 0,7 in | 7 mph | 5 |
| Wed, Aug 26 | ☁️ Overcast | 74° / 53° | 1% | 9 mph | 6 |
| Thu, Aug 27 | 🌦️ Light showers | 83° / 57° | 77% · 0,1 in | 7 mph | 6 |
| Fri, Aug 28 | ⛈️ Thunderstorm | 71° / 60° | 77% · 0,7 in | 6 mph | 4 |
| Sat, Aug 29 | 🌤️ Mainly clear | 69° / 52° | 24% | 9 mph | 6 |
| Sun, Aug 30 | 🌦️ Light rain | 67° / 51° | 26% · 0,3 in | 8 mph | 5 |
| Mon, Aug 31 | 🌧️ Heavy drizzle | 64° / 49° | 26% · 0,1 in | 10 mph | 4 |
| Tue, Sep 1 | 🌦️ Light drizzle | 62° / 44° | 19% · 0,0 in | 8 mph | 5 |
| Wed, Sep 2 | 🌦️ Drizzle | 64° / 47° | 21% · 0,1 in | 7 mph | 4 |
| Thu, Sep 3 | ☁️ Overcast | 64° / 44° | 22% | 8 mph | 3 |
| Fri, Sep 4 | ☁️ Overcast | 59° / 47° | 17% | 7 mph | 2 |
| Sat, Sep 5 | 🌦️ Light drizzle | 70° / 47° | 23% · 0,0 in | 7 mph | 5 |
| Sun, Sep 6 | ☁️ Overcast | 67° / 52° | 23% | 12 mph | 5 |
| Mon, Sep 7 | 🌦️ Light rain | 59° / 54° | 35% · 0,6 in | 16 mph | 1 |
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° | 5,3 in | ★★★★☆ |
| September | 69° | 51° | 2,8 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 July and 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 62°F (17°C) with partly cloudy. Humidity is 96% and wind is 6 mph.
When is the best time to visit St. Lawrence River?
July and 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 6:20 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 August 24, 2026 at 6:20 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
