Marathon, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marathon, a city in Buena Vista County, Iowa.
Today
71°F
Patchy Smoke
Patchy smoke and scattered showers and thunderstorms before 1pm, then scattered showers and thunderstorms between 1pm and 2pm, then a chance of showers and thunderstorms between 2pm and 4pm, then scattered showers and thunderstorms. Mostly cloudy, with a high near 71. North wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Marathon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Patchy Smoke | 5 to 10 mph N | 70% |
| Tonight | 55°F | Patchy Smoke | 0 to 5 mph N | 65% |
| Wednesday | 76°F | Mostly Sunny | 0 mph | 3% |
| Wednesday Night | 53°F | Mostly Clear | 0 mph | 1% |
| Thursday | 82°F | Sunny | 0 to 10 mph S | 0% |
| Thursday Night | 60°F | Mostly Clear | 5 mph S | 4% |
| Friday | 86°F | Sunny | 5 to 15 mph SSW | 7% |
| Friday Night | 64°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 16% |
| Saturday | 89°F | Sunny | 5 to 15 mph S | 11% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SE | 25% |
| Sunday | 88°F | Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SE | 25% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 10 mph SE | 29% |
| Monday | 87°F | Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph E | 29% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ENE | 30% |
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 Aug 4, 2026.