Thayer, IA Weather & Growing Conditions
Tonight
45°F
Chance Rain Showers then Cloudy
A chance of rain showers before 10pm. Cloudy, with a low around 45. Northwest wind 10 to 14 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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 45°F | Chance Rain Showers then Cloudy | 10 to 14 mph NW | 48% |
| Wednesday | 52°F | Mostly Cloudy | 12 to 15 mph W | 11% |
| Wednesday Night | 42°F | Mostly Cloudy | 10 mph W | 8% |
| Thursday | 52°F | Chance Rain Showers | 10 mph WNW | 38% |
| Thursday Night | 40°F | Mostly Cloudy | 8 mph NNW | 12% |
| Friday | 52°F | Partly Sunny | 3 to 7 mph N | 4% |
| Friday Night | 34°F | Mostly Cloudy | 2 mph NNW | 0% |
| Saturday | 56°F | Mostly Sunny | 1 to 5 mph WSW | 2% |
| Saturday Night | 37°F | Mostly Clear | 5 mph W | 4% |
| Sunday | 62°F | Sunny | 6 mph W | 4% |
| Sunday Night | 40°F | Mostly Clear | 6 mph SW | 1% |
| Monday | 65°F | Sunny | 6 to 12 mph SW | 0% |
| Monday Night | 42°F | Mostly Clear | 6 mph WNW | 0% |
| Tuesday | 64°F | Mostly Sunny | 7 mph N | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Thayer, IA
Last spring frost
Apr 23
First fall frost
Oct 17
Growing season
176 days
Hardiness zone
5b
Explore more for Thayer, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Beaconsfield, Ia (12.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.