Callao, MO Weather & Growing Conditions
Overnight
48°F
Patchy Drizzle
Patchy drizzle. Cloudy, with a low around 48. West wind around 13 mph, with gusts as high as 22 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Patchy Drizzle | 13 mph W | 10% |
| Wednesday | 56°F | Patchy Drizzle then Cloudy | 12 to 16 mph W | 9% |
| Wednesday Night | 41°F | Mostly Cloudy | 9 mph WSW | 1% |
| Thursday | 56°F | Partly Sunny | 8 to 12 mph W | 2% |
| Thursday Night | 42°F | Mostly Cloudy | 7 mph NNW | 10% |
| Friday | 53°F | Partly Sunny | 5 to 9 mph N | 2% |
| Friday Night | 32°F | Partly Cloudy | 0 to 3 mph NNE | 0% |
| Saturday | 54°F | Mostly Sunny | 0 to 3 mph NNW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph WNW | 2% |
| Sunday | 60°F | Sunny | 2 to 6 mph W | 1% |
| Sunday Night | 35°F | Clear | 2 mph WSW | 0% |
| Monday | 65°F | Sunny | 2 to 9 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph WSW | 0% |
| Tuesday | 67°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Callao, MO
Last spring frost
Apr 8
First fall frost
Oct 28
Growing season
201 days
Hardiness zone
6a
Explore more for Callao, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Long Branch Rsvr, Mo (7.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.