West Branch, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for West Branch, a city in Cedar County, Iowa.
This Afternoon
79°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny. High near 79, with temperatures falling to around 77 in the afternoon. Southwest wind around 5 mph. Chance of precipitation is 50%.
7-day forecast for West Branch
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Chance Showers And Thunderstorms | 5 mph SW | 48% |
| Tonight | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph N | 90% |
| Sunday | 67°F | Rain Showers Likely | 10 to 15 mph NE | 63% |
| Sunday Night | 57°F | Chance Rain Showers | 10 to 15 mph NE | 50% |
| Monday | 62°F | Rain Showers Likely | 10 to 15 mph NE | 72% |
| Monday Night | 53°F | Rain Showers Likely | 10 mph NE | 72% |
| Tuesday | 61°F | Chance Rain Showers | 10 mph NE | 53% |
| Tuesday Night | 50°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 64°F | Mostly Sunny | 5 mph NE | 2% |
| Wednesday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph E | 8% |
| Thursday Night | 57°F | Slight Chance Rain Showers | 0 mph | 20% |
| Friday | 69°F | Slight Chance Rain Showers then Partly Sunny | 0 to 5 mph E | 16% |
| Friday Night | 57°F | Partly Cloudy | 0 to 5 mph E | 10% |
Forecast source: National Weather Service (api.weather.gov) for West Branch (41.666, -91.344). Updated through the day.
Growing snapshot for West Branch
Last spring frost
Apr 29
First fall frost
Oct 9
Growing season
162 days
Hardiness zone
5b
More local growing data for West Branch: nearby ZIP 52358 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Iowa City, Ia (11.2 mi from West Branch). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.