Swan, IA Weather & Growing Conditions
Today
86°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny. High near 86, with temperatures falling to around 83 in the afternoon. West northwest wind 6 to 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Chance Showers And Thunderstorms | 6 to 9 mph WNW | 47% |
| Tonight | 64°F | Showers And Thunderstorms | 7 to 10 mph NNE | 91% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 8 mph NNE | 81% |
| 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 | 61°F | Mostly Clear | 3 mph SE | 3% |
| Friday | 86°F | Sunny | 2 to 7 mph SSE | 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 | 12 mph S | 27% |
| Monday | 91°F | Chance Showers And Thunderstorms then Mostly Sunny | 10 to 14 mph S | 27% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 13 mph SE | 26% |
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 Aug 4, 2026.