Waltham, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waltham, a city in Mower County, Minnesota.
Tonight
48°F
Rain Showers
Rain showers. Cloudy. Low around 48, with temperatures rising to around 51 overnight. North wind around 9 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Waltham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Rain Showers | 9 mph N | 97% |
| Wednesday | 51°F | Rain Showers | 9 to 15 mph SW | 97% |
| Wednesday Night | 43°F | Rain Showers | 15 mph W | 98% |
| Thursday | 48°F | Rain Showers Likely | 15 mph N | 69% |
| Thursday Night | 35°F | Mostly Cloudy | 8 to 13 mph N | 11% |
| Friday | 45°F | Partly Sunny | 5 to 9 mph N | 0% |
| Friday Night | 29°F | Partly Cloudy | 3 mph NW | 0% |
| Saturday | 50°F | Mostly Sunny | 2 to 8 mph SW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 7 mph W | 8% |
| Sunday | 55°F | Sunny | 7 to 10 mph W | 9% |
| Sunday Night | 37°F | Mostly Clear | 6 to 9 mph SW | 2% |
| Monday | 58°F | Mostly Sunny | 9 to 14 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 8 mph W | 1% |
| Tuesday | 55°F | Mostly Sunny | 9 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov) for Waltham (43.819, -92.875). Updated through the day.
Growing snapshot for Waltham
Last spring frost
Apr 30
First fall frost
Oct 5
Growing season
158 days
Hardiness zone
4b
More local growing data for Waltham: nearby ZIP 55982 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Adams
Austin
Brownsdale
Dexter
Elkton
Grand Meadow
High Forest
Lansing
Le Roy
Lyle
Mapleview
Ostrander
Racine
Rose Creek
Sargeant
Taopi
Climate data from the nearest NOAA station, Austin Waste Wtp Facility, Mn (12 mi from Waltham). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.