Waltham, MN Weather & Growing Conditions
Today
72°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 72, with temperatures falling to around 68 in the afternoon. Northwest wind 8 to 12 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Showers And Thunderstorms | 8 to 12 mph NW | 82% |
| Tonight | 55°F | Chance Showers And Thunderstorms | 3 to 8 mph NW | 50% |
| 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% |
| Monday Night | 64°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph NE | 29% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Waltham, MN
Last spring frost
Apr 30
First fall frost
Oct 5
Growing season
158 days
Hardiness zone
4b
Explore more for Waltham, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Austin Waste Wtp Facility, Mn (12 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.