Barnum, IA Weather & Growing Conditions
Tonight
66°F
Patchy Fog then Chance Showers And Thunderstorms
Patchy fog and showers and thunderstorms likely before 11pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South southeast wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 66°F | Patchy Fog then Chance Showers And Thunderstorms | 5 to 8 mph SSE | 56% |
| Saturday | 75°F | Patchy Fog then Chance Showers And Thunderstorms | 3 to 7 mph NW | 48% |
| Saturday Night | 59°F | Slight Chance Rain Showers | 10 mph N | 19% |
| Sunday | 67°F | Chance Rain Showers | 12 mph NE | 25% |
| Sunday Night | 54°F | Chance Rain Showers | 9 mph ENE | 37% |
| Monday | 60°F | Rain Showers Likely | 9 mph ENE | 62% |
| Monday Night | 50°F | Rain Showers Likely | 3 to 7 mph NE | 60% |
| Tuesday | 61°F | Mostly Cloudy | 6 mph ENE | 12% |
| Tuesday Night | 46°F | Partly Cloudy | 3 mph E | 2% |
| Wednesday | 64°F | Mostly Sunny | 3 mph ESE | 3% |
| Wednesday Night | 50°F | Partly Cloudy | 1 mph SE | 12% |
| Thursday | 67°F | Slight Chance Rain Showers | 2 mph SSE | 21% |
| Thursday Night | 54°F | Mostly Cloudy | 1 mph ESE | 13% |
| Friday | 69°F | Partly Sunny | 3 mph ESE | 13% |
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 Sep 19, 2026.