Barnum, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnum, a city in Webster County, Iowa.
Today
75°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms before 10am, then patchy fog and a slight chance of showers and thunderstorms between 10am and 11am, then a chance of showers and thunderstorms between 11am and 1pm, then a slight chance of showers and thunderstorms between 1pm and 3pm. Mostly cloudy. High near 75, with temperatures falling to around 73 in the afternoon. Northwest wind around 7 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 |
|---|---|---|---|---|
| Today | 75°F | Patchy Fog | 7 mph NW | 35% |
| Tonight | 59°F | Slight Chance Rain Showers | 10 mph N | 19% |
| Sunday | 66°F | Chance Drizzle | 12 mph NE | 35% |
| Sunday Night | 54°F | Rain Showers Likely | 9 mph ENE | 58% |
| Monday | 61°F | Rain Showers Likely | 9 mph ENE | 58% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 3 to 7 mph ENE | 47% |
| Tuesday | 61°F | Partly Sunny | 5 mph ENE | 8% |
| Tuesday Night | 45°F | Mostly Clear | 3 mph E | 1% |
| Wednesday | 66°F | Sunny | 3 mph ESE | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 1 mph SE | 10% |
| Thursday | 67°F | Slight Chance Rain Showers | 3 mph SE | 19% |
| Thursday Night | 54°F | Mostly Cloudy | 1 mph SE | 9% |
| Friday | 70°F | Partly Sunny | 1 to 5 mph SE | 9% |
| Friday Night | 55°F | Mostly Cloudy | 3 mph SE | 11% |
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
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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 19, 2026.