Grand Lake St. Marys SPB Weather Forecast
- 43
- 67
Sunny
- 66
- 77
Mostly Sunny
- 53
- 80
Rain Showers Likely
- 58
- 68
Rain Showers
- 54
- 72
Rain Showers
- 43
- 65
Chance Rain Showers
Today 27 Apr Mercer
Sunny. Highs in the upper 60s. East Winds 5 to 10 Mph.
Tonight 27 Apr Mercer
Clear. Lows in the lower 40s. Southeast Winds 5 to 10 Mph.
Grand Lake St. Marys SPB Temperature Statistics
April Temperature
Versailles Darke County Airport (23 miles)
Lowest 8 April, 2025
23 °FAverage April
50.3 °FHighest 24 April, 2025
82.4 °F
Climate (2020–Present)
Versailles Darke County Airport (23 miles)
Average Low 2020–2025
43.2 °FAverage 2020–2025
52.3 °FAverage High 2020–2025
61.6 °F