Arnold, MO Weather & Growing Conditions
Today
88°F
Sunny
Sunny, with a high near 88. South wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 2 to 6 mph S | 0% |
| Tonight | 67°F | Mostly Clear | 2 to 6 mph SE | 0% |
| Wednesday | 91°F | Sunny | 5 mph S | 8% |
| Wednesday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 mph S | 60% |
| Thursday | 88°F | Showers And Thunderstorms Likely | 5 mph S | 67% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 42% |
| Friday | 88°F | Chance Showers And Thunderstorms | 3 mph SW | 42% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 35% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 3 mph SW | 35% |
| Saturday Night | 72°F | Mostly Clear | 5 mph S | 7% |
| Sunday | 92°F | Sunny | 6 mph SW | 7% |
| Sunday Night | 74°F | Mostly Clear | 6 mph S | 6% |
| Monday | 94°F | Sunny | 6 mph SW | 6% |
| Monday Night | 75°F | Mostly Clear | 7 mph SW | 13% |
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 Aug 4, 2026.