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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. The area gets 256 sunny days per year, above the national average. 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) |
| Sunny Days | 256 days/yr |
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").