West Branch, IA Weather & Growing Conditions
Today
86°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Mostly sunny. High near 86, with temperatures falling to around 82 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 32% |
| Tonight | 66°F | Showers And Thunderstorms Likely | 5 mph N | 84% |
| Wednesday | 77°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph NE | 82% |
| Wednesday Night | 60°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph N | 55% |
| Thursday | 80°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 30% |
| Thursday Night | 61°F | Mostly Clear | 0 mph | 3% |
| Friday | 82°F | Sunny | 0 to 5 mph SE | 4% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 11% |
| Saturday | 86°F | Sunny | 5 mph S | 10% |
| Saturday Night | 71°F | Mostly Clear | 5 mph S | 14% |
| Sunday | 87°F | Sunny | 5 to 10 mph S | 14% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 10 mph S | 33% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for West Branch, IA
Last spring frost
Apr 29
First fall frost
Oct 9
Growing season
162 days
Hardiness zone
5b
Explore more for West Branch, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Iowa City, Ia (11.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.