Meramec State Park Weather Forecast
- 63
- 92
Mostly Sunny
- 62
- 92
Mostly Sunny
- 64
- 93
Mostly Cloudy
- 62
- 83
Chance Rain Showers
- 63
- 84
Chance Rain Showers
- 65
- 84
Chance Rain Showers
Today 16 Sep Franklin
Patchy fog this morning. Sunny. Highs in the lower 90s. Northeast Winds around 5 Mph.
Tonight 16 Sep Franklin
Mostly clear. Lows in the lower 60s. East Winds around 5 Mph.
Meramec State Park Temperature Statistics
September Temperature
Washington Regional Airport (26.1 miles)
Lowest 8 September, 2025
42.8 °FAverage September
68.3 °FHighest 13 September, 2025
96.8 °F
Climate (2020–Present)
Washington Regional Airport (26.1 miles)
Average Low 2020–2025
47.3 °FAverage 2020–2025
57.8 °FAverage High 2020–2025
68.7 °F