West Branch, IA Weather & Growing Conditions
Tonight
50°F
Chance Rain Showers
A chance of rain showers before 3am. Mostly cloudy. Low around 50, with temperatures rising to around 53 overnight. South wind 10 to 15 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Chance Rain Showers | 10 to 15 mph S | 30% |
| Wednesday | 54°F | Chance Rain Showers | 10 to 15 mph SW | 29% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 10 to 15 mph SW | 17% |
| Thursday | 53°F | Chance Rain Showers | 10 mph W | 49% |
| Thursday Night | 43°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph NW | 23% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 7% |
| Friday Night | 35°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 mph NW | 8% |
| Sunday Night | 37°F | Mostly Clear | 0 to 5 mph W | 3% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.