Waltham, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waltham, a city in Mower County, Minnesota.
Today
62°F
Chance Rain Showers
A chance of rain showers. Cloudy, with a high near 62. Northeast wind 7 to 10 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Waltham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Chance Rain Showers | 7 to 10 mph NE | 54% |
| Tonight | 54°F | Slight Chance Rain Showers then Cloudy | 13 mph NE | 19% |
| Sunday | 66°F | Mostly Cloudy | 15 mph NE | 6% |
| Sunday Night | 49°F | Mostly Cloudy | 13 mph NE | 7% |
| Monday | 60°F | Slight Chance Rain Showers | 13 mph E | 20% |
| Monday Night | 44°F | Mostly Cloudy | 6 to 9 mph E | 13% |
| Tuesday | 60°F | Mostly Sunny | 6 to 9 mph E | 6% |
| Tuesday Night | 41°F | Mostly Clear | 3 to 7 mph E | 1% |
| Wednesday | 63°F | Sunny | 3 to 7 mph SE | 2% |
| Wednesday Night | 46°F | Mostly Clear | 6 mph SE | 7% |
| Thursday | 65°F | Mostly Sunny | 6 mph SE | 10% |
| Thursday Night | 50°F | Partly Cloudy | 5 mph SE | 5% |
| Friday | 68°F | Mostly Sunny | 3 to 7 mph SE | 3% |
| Friday Night | 51°F | Partly Cloudy | 6 mph SE | 9% |
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
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Austin
Brownsdale
Dexter
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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 Sep 19, 2026.