Waltham, MN Weather & Growing Conditions
Overnight
48°F
Rain Showers
Rain showers. Cloudy. Low around 48, with temperatures rising to around 51 overnight. Northwest wind around 9 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Rain Showers | 9 mph NW | 95% |
| Wednesday | 50°F | Rain Showers | 10 to 15 mph W | 81% |
| Wednesday Night | 43°F | Rain Showers | 12 to 15 mph W | 92% |
| Thursday | 48°F | Chance Rain Showers | 13 to 16 mph NW | 49% |
| Thursday Night | 33°F | Mostly Cloudy | 6 to 12 mph N | 5% |
| Friday | 44°F | Mostly Sunny | 5 to 8 mph N | 0% |
| Friday Night | 27°F | Mostly Clear | 3 mph NW | 0% |
| Saturday | 47°F | Sunny | 2 to 8 mph SW | 1% |
| Saturday Night | 34°F | Mostly Clear | 8 mph W | 1% |
| Sunday | 52°F | Sunny | 9 mph W | 3% |
| Sunday Night | 36°F | Mostly Clear | 8 mph SW | 0% |
| Monday | 58°F | Mostly Sunny | 8 to 13 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 to 8 mph W | 0% |
| Tuesday | 56°F | Sunny | 7 mph NW | 0% |
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 Nov 4, 2026.