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Deep River (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Deep River.
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Climate overview of Deep River
The climate in Deep River, Ontario, Canada, is marked by large temperature swings across the seasons, ranging from 26°C (79°F) in July to -6°C (21°F) in January.
With around 1013 mm (40 in) of annual rain/snowfall, Deep River has a notably wet climate. However, this rain/snowfall is not evenly distributed, the city has warm summers and very cold winters. The wettest month is September.
Deep River Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Deep River - and find the best time to visit.
Monthly Temperature in Deep River
In Deep River, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 26°C (79°F) in July. In January, the coolest month of the year, temperatures drop to a very cold -6°C (21°F).
At night, temperatures range from around 14°C (57°F) in July to -17°C (1°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Deep River
Deep River experiences significant rain/snowfall throughout the year, averaging 1013 mm (40 in) of precipitation annually. Deep River experiences moderate seasonal variation in rainfall, with monthly averages ranging from 99 mm (3.9 in) in September, the wettest month, and 60 mm (2.4 in) in February, the driest month. For more details, please visit our Deep River Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Deep River
Conditions in Deep River are generally most comfortable in June, July, August and September. They are typically least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
very cold
Mar
cold
Apr
mixed
May
very good
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
mixed
Nov
cold
Dec
very cold
- Best overall: June, July, August and September
- Warmest weather: July and August
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -17°C (1°F).
Frequently asked questions about the climate in Deep River
What is the best time to visit Deep River?
June, July, August and September typically offer the most optimal weather in Deep River. In contrast, January, February, March, November and December tend to have less optimal conditions. Deep River has warm summers and very cold winters.
What temperatures can I expect in Deep River?
Daytime highs range from -6°C (21°F) in January to 26°C (79°F) in July. Nighttime lows range from -17°C (1°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Deep River get?
Annual rainfall is around 1013 mm (40 in). September is the wettest month with 99 mm (3.9 in), while February is the driest with 60 mm (2.4 in).
Deep River 3-Day Forecast
Deep River on the map
Deep River is highlighted - select any city to see its climate.
Popular in September
Where to go in September - average daytime high across popular destinations.
Toronto
22°C (72°F) Niagara Falls23°C (73°F) Montréal
22°C (72°F) Ottawa22°C (72°F) Quebec City
20°C (68°F) Vancouver19°C (66°F) Calgary19°C (66°F) Whistler15°C (59°F) Bucket list
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