Weather & Climate in Seaforth, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Seaforth has a cool climate with an average annual temperature of 45°F (7°C). Winters average 20°F in January while summers reach 68°F in July. Annual precipitation totals 44.1 inches. The area receives 14.8 inches of snow annually. The city sits at an elevation of 1,010 feet.
Temperature
20°F Jan (-7°C)
68°F Jul (20°C)
| Annual Average | 44.6°F |
| 17% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 68°F (20°C) |
Geography
| Elevation | 1,010 ft (308 m) |
| Area | 258.4 sq mi (669.2 km²) |
| Population Density | 10/sq mi |
| Coordinates | 43.5501°N, 81.3998°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.5.
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 111 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 2.7 m (9 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1823 | LAKE ERIE | Unknown | 2.7 m | - | 144 km |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 95 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 4.1 in | Coldest |
| February | 20°F (-6°C) | 3.2 in | |
| March | 29°F (-2°C) | 2.9 in | Driest |
| April | 42°F (5°C) | 3.1 in | |
| May | 54°F (12°C) | 3.5 in | |
| June | 63°F (17°C) | 2.9 in | |
| July | 68°F (20°C) | 3.2 in | Warmest |
| August | 67°F (19°C) | 3.8 in | |
| September | 60°F (16°C) | 4.6 in | |
| October | 49°F (9°C) | 3.9 in | |
| November | 37°F (3°C) | 4.5 in | |
| December | 27°F (-3°C) | 4.7 in | Wettest |
Seaforth has a seasonal temperature swing of 49°F / from 20°F in January to 68°F in July. Total annual precipitation is 44.1 inches, with December being the wettest month (4.7") and March the driest (2.9").