Swan, IA Weather & Growing Conditions
This Afternoon
70°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy. High near 70, with temperatures falling to around 64 in the afternoon. East wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Showers And Thunderstorms Likely | 8 mph E | 62% |
| Tonight | 48°F | Chance Rain Showers | 8 to 14 mph WNW | 50% |
| Wednesday | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 16 mph W | 19% |
| Wednesday Night | 45°F | Mostly Cloudy | 14 mph W | 14% |
| Thursday | 53°F | Chance Rain Showers | 12 mph WNW | 52% |
| Thursday Night | 42°F | Mostly Cloudy | 9 mph NNW | 12% |
| Friday | 53°F | Partly Sunny | 5 to 9 mph N | 2% |
| Friday Night | 36°F | Mostly Cloudy | 3 mph NW | 0% |
| Saturday | 57°F | Mostly Sunny | 1 to 6 mph WSW | 3% |
| Saturday Night | 38°F | Mostly Clear | 5 mph W | 4% |
| Sunday | 63°F | Sunny | 5 to 8 mph W | 5% |
| Sunday Night | 40°F | Mostly Clear | 6 mph SW | 1% |
| Monday | 66°F | Sunny | 6 to 12 mph SW | 0% |
| Monday Night | 43°F | Mostly Clear | 7 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Swan, IA
Last spring frost
Apr 21
First fall frost
Oct 15
Growing season
174 days
Hardiness zone
5b
Explore more for Swan, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Des Moines 17 E, Ia (7.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.