Callao, MO Weather & Growing Conditions
Overnight
73°F
Partly Cloudy
Partly cloudy, with a low around 73. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 73°F | Partly Cloudy | 6 mph S | 2% |
| Saturday | 91°F | Partly Sunny | 6 to 9 mph SSW | 2% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 2 to 6 mph WSW | 57% |
| Sunday | 78°F | Chance Showers And Thunderstorms | 3 to 9 mph NNE | 49% |
| Sunday Night | 60°F | Showers And Thunderstorms | 10 mph NE | 80% |
| Monday | 67°F | Showers And Thunderstorms | 12 mph NE | 80% |
| Monday Night | 54°F | Chance Rain Showers | 10 mph NE | 28% |
| Tuesday | 64°F | Mostly Cloudy | 12 mph NE | 9% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 8 mph NE | 6% |
| Wednesday | 68°F | Mostly Sunny | 7 mph NE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 2 to 6 mph NE | 2% |
| Thursday | 71°F | Partly Sunny | 5 mph ENE | 7% |
| Thursday Night | 55°F | Mostly Cloudy | 5 mph ENE | 10% |
| Friday | 72°F | Slight Chance Rain Showers | 6 mph E | 17% |
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 Sep 19, 2026.