West Branch, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for West Branch, a city in Cedar County, Iowa.
Tonight
64°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1am, then showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy. Low around 64, with temperatures rising to around 67 overnight. North wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for West Branch
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 64°F | Showers And Thunderstorms Likely | 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% |
| Saturday | 70°F | Mostly Sunny | 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.