Barnum, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnum, a city in Webster County, Iowa.
Tonight
58°F
Cloudy
Cloudy. Low around 58, with temperatures rising to around 60 overnight. North wind 8 to 12 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Barnum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Cloudy | 8 to 12 mph N | 12% |
| Sunday | 66°F | Chance Drizzle | 12 mph NE | 35% |
| Sunday Night | 53°F | Rain Showers Likely | 9 mph ENE | 59% |
| Monday | 58°F | Rain Showers | 9 mph NE | 81% |
| Monday Night | 49°F | Rain Showers Likely | 3 to 7 mph NE | 64% |
| Tuesday | 62°F | Partly Sunny | 6 mph ENE | 8% |
| Tuesday Night | 45°F | Partly Cloudy | 3 mph E | 1% |
| Wednesday | 66°F | Mostly Sunny | 3 mph ESE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 2 mph SE | 14% |
| Thursday | 68°F | Chance Rain Showers | 5 mph SSE | 31% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 2 mph SE | 23% |
| Friday | 71°F | Slight Chance Rain Showers | 1 to 5 mph ESE | 17% |
| Friday Night | 58°F | Mostly Cloudy then Slight Chance Rain Showers | 2 mph ESE | 17% |
| Saturday | 70°F | Chance Rain Showers | 3 to 8 mph SE | 33% |
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 Sep 20, 2026.