Arnold, MO Weather & Growing Conditions
Overnight
73°F
Mostly Clear
Mostly clear, with a low around 73. Southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 73°F | Mostly Clear | 3 mph SE | 3% |
| Saturday | 99°F | Mostly Sunny | 2 to 6 mph SW | 4% |
| Saturday Night | 73°F | Partly Cloudy | 5 mph SW | 4% |
| Sunday | 94°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 28% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 7 mph N | 65% |
| Monday | 80°F | Showers And Thunderstorms Likely | 7 mph N | 65% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 5 to 8 mph N | 61% |
| Tuesday | 72°F | Slight Chance Rain Showers then Partly Sunny | 9 mph N | 22% |
| Tuesday Night | 54°F | Mostly Cloudy | 3 to 9 mph N | 4% |
| Wednesday | 74°F | Mostly Sunny | 7 mph N | 1% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 6 mph N | 0% |
| Thursday | 77°F | Mostly Sunny | 2 to 6 mph N | 1% |
| Thursday Night | 57°F | Mostly Cloudy | 5 mph NE | 4% |
| Friday | 77°F | Partly Sunny | 2 to 6 mph NE | 7% |
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 (13.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.