Meramec State Park Weather Forecast
- 17
- 73
Chance Rain Showers
- 16
- 29
Partly Sunny
- 28
- 37
Mostly Sunny
- 29
- 46
Partly Sunny
- 23
- 46
Partly Sunny
- 35
- 48
Mostly Cloudy
Today 28 Dec Franklin
Cloudy. A chance of rain with a slight chance of Thunderstorms in the Morning, then rain with a chance of Thunderstorms in the afternoon. Highs around 70. Temperature falling into the lower 50s in the afternoon. South Winds 10 to 15 Mph, becoming west 15 to 20 Mph in the afternoon. Gusts up to 35 Mph. Chance of rain 80 percent.
Tonight 28 Dec Franklin
Cloudy with a 20 percent chance of Showers. Not as cool. Near steady temperature in the mid 60s. South Winds 5 to 10 Mph with Gusts up to 25 Mph.
Meramec State Park Temperature Statistics
December Temperature
Washington Regional Airport (26.1 miles)
Lowest 14 December, 2025
8.6 °FAverage December
38.3 °FHighest 25 December, 2025
71.6 °F
Climate (2020–Present)
Washington Regional Airport (26.1 miles)
Average Low 2020–2025
47.6 °FAverage 2020–2025
58.1 °FAverage High 2020–2025
69 °F