Barnum, IA Weather & Growing Conditions
Today
76°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 76, with temperatures falling to around 73 in the afternoon. North wind around 9 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Showers And Thunderstorms | 9 mph N | 86% |
| Tonight | 58°F | Showers And Thunderstorms Likely | 2 to 7 mph N | 56% |
| Wednesday | 75°F | Partly Sunny | 5 mph NE | 9% |
| Wednesday Night | 53°F | Mostly Clear | 2 mph SE | 2% |
| Thursday | 81°F | Sunny | 0 to 5 mph S | 1% |
| Thursday Night | 60°F | Mostly Clear | 5 mph S | 2% |
| Friday | 85°F | Sunny | 3 to 9 mph S | 6% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph S | 21% |
| Saturday | 89°F | Slight Chance Showers And Thunderstorms then Sunny | 2 to 10 mph S | 15% |
| Saturday Night | 68°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 7 to 10 mph SSE | 20% |
| Sunday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 9 mph SSE | 20% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms | 8 mph SSE | 31% |
| Monday | 88°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 mph SE | 31% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 mph E | 31% |
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 Aug 4, 2026.