Waltham, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waltham, a city in Mower County, Minnesota.
Overnight
65°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy. Low around 65, with temperatures rising to around 68 overnight. Southwest wind around 12 mph, with gusts as high as 22 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Waltham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Chance Showers And Thunderstorms | 12 mph SW | 49% |
| Tuesday | 72°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 12 mph W | 57% |
| Tuesday Night | 55°F | Chance Showers And Thunderstorms then Mostly Cloudy | 3 to 8 mph NW | 51% |
| Wednesday | 73°F | Mostly Sunny | 5 mph NW | 1% |
| Wednesday Night | 55°F | Mostly Clear | 5 mph SW | 0% |
| Thursday | 76°F | Sunny | 5 to 9 mph S | 0% |
| Thursday Night | 60°F | Mostly Clear | 9 mph S | 1% |
| Friday | 79°F | Sunny | 8 to 14 mph S | 12% |
| Friday Night | 63°F | Mostly Clear | 12 mph S | 14% |
| Saturday | 80°F | Sunny | 8 to 12 mph S | 12% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 14 mph SW | 38% |
| Sunday | 80°F | Chance Showers And Thunderstorms | 10 mph SW | 38% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 9 mph E | 36% |
| Monday | 79°F | Chance Showers And Thunderstorms | 10 mph E | 36% |
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
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High Forest
Lansing
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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 Aug 4, 2026.