Barnum, IA Weather & Growing Conditions
Overnight
42°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 42, with temperatures rising to around 44 overnight. West northwest wind around 14 mph, with gusts as high as 22 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Chance Rain Showers | 14 mph WNW | 37% |
| Wednesday | 49°F | Chance Rain Showers | 12 to 15 mph WNW | 37% |
| Wednesday Night | 42°F | Rain Showers Likely | 12 mph WNW | 55% |
| Thursday | 50°F | Chance Rain Showers then Mostly Cloudy | 12 mph NW | 36% |
| Thursday Night | 36°F | Mostly Cloudy | 3 to 8 mph N | 1% |
| Friday | 49°F | Mostly Sunny | 3 mph N | 1% |
| Friday Night | 29°F | Partly Cloudy | 1 mph W | 0% |
| Saturday | 52°F | Mostly Sunny | 3 mph SSW | 0% |
| Saturday Night | 35°F | Mostly Clear | 2 mph WSW | 1% |
| Sunday | 58°F | Sunny | 3 mph W | 0% |
| Sunday Night | 37°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 64°F | Sunny | 7 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 3 mph WNW | 0% |
| Tuesday | 62°F | Mostly Sunny | 2 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Barnum, IA
Last spring frost
Apr 28
First fall frost
Oct 8
Growing season
162 days
Hardiness zone
5a
Explore more for Barnum, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Ft Dodge 5Nnw, Ia (10.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.