Arnold, MO Weather & Growing Conditions
Overnight
53°F
Slight Chance Drizzle
A slight chance of drizzle. Mostly cloudy, with a low around 53. West wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Slight Chance Drizzle | 7 mph W | 11% |
| Wednesday | 60°F | Slight Chance Drizzle then Mostly Cloudy | 6 to 10 mph W | 12% |
| Wednesday Night | 42°F | Mostly Clear | 5 mph W | 0% |
| Thursday | 66°F | Sunny | 5 to 8 mph W | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 5 mph NW | 3% |
| Friday | 57°F | Partly Sunny | 8 mph N | 2% |
| Friday Night | 35°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 61°F | Sunny | 5 mph NW | 1% |
| Sunday Night | 34°F | Clear | 1 mph W | 0% |
| Monday | 67°F | Sunny | 3 mph SW | 0% |
| Monday Night | 39°F | Clear | 3 mph SW | 1% |
| Tuesday | 69°F | Sunny | 3 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Arnold, MO
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
7a
Explore more for Arnold, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Festus, Mo (11.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.