St Marys Weather Forecast
- 72
- 98
Slight Chance Rain Showers
- 68
- 88
Mostly Cloudy
- 69
- 90
Mostly Sunny
- 69
- 89
Rain Showers Likely
- 66
- 82
Slight Chance Thunderstorms
- 64
- 83
Mostly Sunny
Today 27 Jul Warren
Mostly sunny. A slight chance of Showers this afternoon. Hot with Highs in the upper 90s. Southwest Winds 5 to 10 Mph, becoming northwest this afternoon. Chance of rain 20 percent. Heat index Values up to 114 this afternoon.
Tonight 27 Jul Warren
Partly cloudy in the Evening, then becoming mostly cloudy. Patchy smoke. Humid with Lows in the lower 70s. Northwest Winds around 5 Mph. Heat index Values up to 111 early in the evening.
St Marys Temperature Statistics
July Temperature
Des Moines International Airport (16.2 miles)
Lowest 22 July, 2026
61.6 °FAverage July
78.4 °FHighest 20 July, 2026
98.7 °F
Climate (2021–2026)
Des Moines International Airport (16.2 miles)
Average Low 2021–2026
43.7 °FAverage 2021–2026
53.5 °FAverage High 2021–2026
63.5 °F