Marathon, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marathon, a city in Buena Vista County, Iowa.
Tonight
40°F
Rain Showers
Rain showers. Cloudy. Low around 40, with temperatures rising to around 43 overnight. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Marathon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Rain Showers | 15 mph NW | 84% |
| Wednesday | 47°F | Chance Rain Showers | 15 mph WNW | 40% |
| Wednesday Night | 39°F | Chance Rain Showers | 10 to 15 mph WNW | 46% |
| Thursday | 47°F | Mostly Cloudy | 10 to 15 mph NNW | 13% |
| Thursday Night | 33°F | Mostly Cloudy | 5 to 10 mph N | 2% |
| Friday | 47°F | Mostly Sunny | 0 to 5 mph NNE | 0% |
| Friday Night | 28°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 50°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Saturday Night | 35°F | Mostly Clear | 5 mph W | 6% |
| Sunday | 59°F | Sunny | 5 mph WSW | 5% |
| Sunday Night | 37°F | Mostly Clear | 5 mph SSW | 1% |
| Monday | 62°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph WNW | 0% |
| Tuesday | 59°F | Mostly Sunny | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Marathon (42.860, -94.983). Updated through the day.
Growing snapshot for Marathon
Last spring frost
Apr 30
First fall frost
Oct 5
Growing season
159 days
Hardiness zone
5a
More local growing data for Marathon: nearby ZIP 50565 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sioux Rapids 4 E, Ia (4.1 mi from Marathon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.