Mercer, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercer, a town in Mercer County, Missouri.
Tonight
47°F
Slight Chance Rain Showers then Cloudy
A slight chance of rain showers before 11pm. Cloudy, with a low around 47. West wind around 12 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
7-day forecast for Mercer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Slight Chance Rain Showers then Cloudy | 12 mph W | 24% |
| Wednesday | 53°F | Mostly Cloudy | 10 to 16 mph W | 10% |
| Wednesday Night | 43°F | Mostly Cloudy | 9 mph WSW | 3% |
| Thursday | 53°F | Mostly Cloudy then Chance Rain Showers | 7 to 10 mph WNW | 27% |
| Thursday Night | 42°F | Mostly Cloudy | 8 mph NNW | 11% |
| Friday | 52°F | Partly Sunny | 3 to 8 mph N | 7% |
| Friday Night | 36°F | Mostly Cloudy | 2 mph N | 1% |
| Saturday | 55°F | Partly Sunny | 1 to 5 mph WSW | 1% |
| Saturday Night | 37°F | Mostly Clear | 3 mph W | 5% |
| Sunday | 61°F | Sunny | 6 mph W | 2% |
| Sunday Night | 39°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 64°F | Sunny | 5 to 12 mph SW | 0% |
| Monday Night | 43°F | Mostly Clear | 5 mph WNW | 0% |
| Tuesday | 64°F | Mostly Sunny | 6 mph N | 0% |
Forecast source: National Weather Service (api.weather.gov) for Mercer (40.511, -93.530). Updated through the day.
Growing snapshot for Mercer
Last spring frost
Apr 25
First fall frost
Oct 15
Growing season
174 days
Hardiness zone
5b
More local growing data for Mercer: nearby ZIP 64661 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Princeton, Mo (10.1 mi from Mercer). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.