Swan, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Swan, a city in Marion County, Iowa.
Tonight
48°F
Chance Rain Showers
A chance of rain showers before 3am. Cloudy, with a low around 48. West wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Swan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Chance Rain Showers | 6 to 13 mph W | 53% |
| Wednesday | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 13 to 16 mph W | 20% |
| Wednesday Night | 44°F | Mostly Cloudy | 13 mph W | 14% |
| Thursday | 53°F | Chance Rain Showers | 12 mph WNW | 52% |
| Thursday Night | 42°F | Mostly Cloudy | 9 mph NNW | 11% |
| Friday | 53°F | Partly Sunny | 5 to 8 mph N | 1% |
| Friday Night | 35°F | Mostly Cloudy | 0 to 3 mph NNW | 0% |
| Saturday | 57°F | Mostly Sunny | 0 to 6 mph WSW | 3% |
| Saturday Night | 38°F | Mostly Clear | 3 mph W | 4% |
| Sunday | 63°F | Sunny | 3 to 8 mph W | 5% |
| Sunday Night | 40°F | Mostly Clear | 6 mph SW | 1% |
| Monday | 66°F | Sunny | 5 to 12 mph SW | 0% |
| Monday Night | 42°F | Mostly Clear | 3 to 7 mph W | 0% |
| Tuesday | 65°F | Sunny | 3 to 7 mph NNW | 0% |
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 Nov 4, 2026.