Merrimac Weather Forecast
- 57
- 80
Becoming Sunny
- 62
- 83
Rain Showers
- 54
- 77
Rain Showers
- 52
- 76
Partly Sunny
- 60
- 76
Rain Showers Likely
- 51
- 80
Rain Showers Likely
Today 22 Apr Monroe
Sunny. Highs around 80. Southwest Winds 5 to 10 Mph.
Tonight 22 Apr Monroe
Mostly clear. Lows in the mid 50s. South Winds around 5 Mph.
Merrimac Temperature Statistics
April Temperature
St. Louis Downtown Airport (16.2 miles)
Lowest 6 April, 2026
37.7 °FAverage April
63.6 °FHighest 14 April, 2026
90.6 °F
Climate (2021–Present)
St. Louis Downtown Airport (16.2 miles)
Average Low 2021–2026
47.6 °FAverage 2021–2026
58.3 °FAverage High 2021–2026
69.2 °F