Defiance Weather Forecast
- 53
- 80
Chance Thunderstorms
- 49
- 71
Mostly Sunny
- 45
- 68
Partly Sunny
- 52
- 70
Chance Rain Showers
- 54
- 68
Rain Showers Likely
- 54
- 68
Rain Showers Likely
Today 20 May St. Charles
Mostly sunny with isolated Showers and Thunderstorms. Near steady temperature in the upper 70s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.
Tonight 20 May St. Charles
Partly cloudy in the Evening, then becoming mostly clear. Less humid with Lows in the mid 50s. West Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.
Defiance Temperature Statistics
May Temperature
St. Louis, Spirit Of St. Louis Airport (6.8 miles)
Lowest 6 May, 2025
41.6 °FAverage May
63.2 °FHighest 15 May, 2025
89.7 °F
Climate (2020–Present)
St. Louis, Spirit Of St. Louis Airport (6.8 miles)
Average Low 2020–2025
45.8 °FAverage 2020–2025
56.8 °FAverage High 2020–2025
68.1 °F