Swan, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Swan, a city in Marion County, Iowa.
Today
86°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2pm. Partly sunny. High near 86, with temperatures falling to around 83 in the afternoon. West wind 5 to 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Swan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 9 mph W | 29% |
| Tonight | 64°F | Showers And Thunderstorms | 6 to 10 mph NNE | 90% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 8 mph NNE | 80% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 2 to 7 mph NNE | 46% |
| Thursday | 81°F | Mostly Sunny | 5 mph ENE | 7% |
| Thursday Night | 62°F | Mostly Clear | 3 mph SE | 3% |
| Friday | 86°F | Sunny | 2 to 7 mph S | 6% |
| Friday Night | 67°F | Mostly Clear | 6 mph SSE | 14% |
| Saturday | 90°F | Sunny | 3 to 10 mph S | 9% |
| Saturday Night | 72°F | Mostly Clear | 12 mph SSW | 12% |
| Sunday | 91°F | Mostly Sunny | 12 mph SSW | 12% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms | 10 mph S | 27% |
| Monday | 91°F | Chance Showers And Thunderstorms then Mostly Sunny | 9 to 13 mph SSW | 27% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 13 mph SE | 26% |
Forecast source: National Weather Service (api.weather.gov) for Swan (41.468, -93.310). Updated through the day.
Growing snapshot for Swan
Last spring frost
Apr 21
First fall frost
Oct 15
Growing season
174 days
Hardiness zone
5b
More local growing data for Swan: nearby ZIP 50252 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Des Moines 17 E, Ia (7.1 mi from Swan). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.