South Mountain
Stormont, Dundas and Glengarry Counties, Ontario, Canada
Current Weather
16°62°
Partly Cloudy
Feels Like: 15°59°
Min: -3°26°
Max: 18°64°
The next few hours will be foggy, with today reaching 18°C and dropping to 8°C. The coming days will be cloudy
Hourly Forecast
Want a closer look at the weather?
Premium adds minute-by-minute rain timing, yesterday comparisons, and more detail across Airpult.
Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Daylight Hours
07:39
Sunrise
17:51
Sunset
Moon
17:22
Moonrise
06:54
Moonset
Daily Forecast
Today
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Sunday
Monday
Resources
UV Index
Humidity
Looking at the night sky?
See moon phases, eclipses, and seasons for this year.
View astronomyCurrent stargazing conditions?
See sky darkness, moon phase, and the best viewing window for South Mountain.
View stargazing scoreWeather in South Mountain today, October 25, 2026
Expect reduced visibility in South Mountain on October 25, 2026 where fog patches form. Allow more time for morning journeys if the air stays thick.Expect reduced visibility in South Mountain on October 25, 2026 where fog patches form. Allow more time for morning journeys if the air stays thick.
The day peaks near 18°C and cools toward -3°C. Expect humidity between 52% and 76%, most humid near 19:00. Airflow remains manageable, reaching about 19 km/h around 16:00.The day peaks near 64°F and cools toward 26°F. Expect humidity between 52% and 76%, most humid near 19:00. Airflow remains manageable, reaching about 12 mph around 16:00.
Through the afternoon cloud remains the main feature, with cover near 100% around 19:00. Bright spells should stay limited even as the day wears on. Visibility stays near 16.1 km. Expect sunrise at 07:39, sunset at 17:51, and 10 hours 12 minutes of sunlight today overall.Through the afternoon cloud remains the main feature, with cover near 100% around 19:00. Bright spells should stay limited even as the day wears on. Visibility stays near 10 mi. Expect sunrise at 07:39, sunset at 17:51, and 10 hours 12 minutes of sunlight today overall.
Overall, South Mountain on October 25, 2026 needs patience with visibility, especially early, even as temperatures reach about 18°C.Overall, South Mountain on October 25, 2026 needs patience with visibility, especially early, even as temperatures reach about 64°F.
Frequently asked questions about weather in South Mountain
How warm does it get in South Mountain?
The warmest month in South Mountain is July, with average high temperatures of 27°C. The average temperature during this period is around 22°C.The warmest month in South Mountain is July, with average high temperatures of 81°F. The average temperature during this period is around 71°F.
How cold does it get in South Mountain?
The coldest month in South Mountain is January, with average low temperatures of -11°C. The average temperature during this period is around -7°C.The coldest month in South Mountain is January, with average low temperatures of 13°F. The average temperature during this period is around 20°F.
What is the wettest time of year in South Mountain?
The wettest month in South Mountain is October, with an average of 121 mm of precipitation.The wettest month in South Mountain is October, with an average of 4.7 in of precipitation.
What is the driest time of year in South Mountain?
The driest month in South Mountain is September, with an average of 60 mm of precipitation.The driest month in South Mountain is September, with an average of 2.4 in of precipitation.