Barnum, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnum, a city in Webster County, Iowa.
Overnight
42°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 42, with temperatures rising to around 44 overnight. Northwest wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Barnum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Chance Rain Showers | 15 mph NW | 42% |
| Wednesday | 50°F | Chance Rain Showers | 12 to 15 mph WNW | 37% |
| Wednesday Night | 42°F | Chance Rain Showers | 12 mph WNW | 54% |
| Thursday | 51°F | Chance Rain Showers then Mostly Cloudy | 12 mph NW | 37% |
| Thursday Night | 36°F | Mostly Cloudy | 3 to 8 mph N | 1% |
| Friday | 49°F | Mostly Sunny | 3 mph NNE | 1% |
| Friday Night | 29°F | Partly Cloudy | 1 mph NNE | 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 | 5 to 8 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) for Barnum (42.506, -94.366). Updated through the day.
Growing snapshot for Barnum
Last spring frost
Apr 28
First fall frost
Oct 8
Growing season
162 days
Hardiness zone
5a
More local growing data for Barnum: nearby ZIP 50518 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Badger
Callender
Clare
Coalville
Dayton
Duncombe
Fort Dodge
Gowrie
Harcourt
Lehigh
Moorland
Otho
Vincent
Climate data from the nearest NOAA station, Ft Dodge 5Nnw, Ia (10.5 mi from Barnum). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.