Weather & Climate in South River, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South River has a cool climate with an average annual temperature of 39°F (4°C). Winters average 10°F in January while summers reach 65°F in July. Annual precipitation totals 37.9 inches. The area receives 13.0 inches of snow annually. The city sits at an elevation of 1,217 feet.
Temperature
10°F Jan (-12°C)
65°F Jul (18°C)
| Annual Average | 39.1°F |
| 28% below US avg | |
| January Average | 10°F (-12°C) |
| July Average | 65°F (18°C) |
Geography
| Elevation | 1,217 ft (371 m) |
| Area | 1.6 sq mi (4.1 km²) |
| Population Density | 694/sq mi |
| Coordinates | 45.8334°N, 79.3829°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
7 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Jan 1, 2000 | 17 km NNE of Notre-Dame-du-Lac, Canada | M4.7 | 122 km | 18 km |
| Mar 9, 1998 | Ontario, Canada | M3.9 | 149 km | 1 km |
| Mar 13, 2005 | 5 km N of Greater Sudbury, Canada | M3.6 | 146 km | 18 km |
| Oct 10, 1995 | southern Quebec, Canada | M3.5 | 81 km | 18 km |
| May 2, 2015 | 12 km NE of Notre-Dame-du-Lac, Canada | M3.3 | 116 km | 18 km |
| Jul 29, 2012 | 17 km SSW of Parry Sound, Canada | M2.5 | 90 km | 5 km |
| May 17, 2010 | 19 km WNW of Gravenhurst, Canada | M2.5 | 93 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 10°F (-12°C) | 2.5 in | Coldest |
| February | 13°F (-11°C) | 1.9 in | Driest |
| March | 23°F (-5°C) | 2.4 in | |
| April | 38°F (3°C) | 2.5 in | |
| May | 51°F (11°C) | 3.5 in | |
| June | 59°F (15°C) | 3.3 in | |
| July | 65°F (18°C) | 3.7 in | Warmest |
| August | 63°F (17°C) | 3.6 in | |
| September | 55°F (13°C) | 4.3 in | Wettest |
| October | 44°F (6°C) | 4.0 in | |
| November | 31°F (-0°C) | 3.5 in | |
| December | 18°F (-8°C) | 2.7 in |
South River has a seasonal temperature swing of 54°F / from 10°F in January to 65°F in July. Total annual precipitation is 37.9 inches, with September being the wettest month (4.3") and February the driest (1.9").