Thayer, IA Weather & Growing Conditions
Today
81°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny. High near 81, with temperatures falling to around 78 in the afternoon. West wind around 9 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Slight Chance Rain Showers | 9 mph W | 21% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph N | 61% |
| Sunday | 66°F | Chance Rain Showers then Chance Showers And Thunderstorms | 8 to 12 mph NNE | 34% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 12 mph NE | 62% |
| Monday | 59°F | Rain Showers Likely | 12 mph NE | 62% |
| Monday Night | 52°F | Chance Rain Showers | 7 to 10 mph NE | 48% |
| Tuesday | 58°F | Partly Sunny | 8 mph NE | 12% |
| Tuesday Night | 46°F | Partly Cloudy | 3 to 7 mph ENE | 7% |
| Wednesday | 62°F | Mostly Sunny | 5 mph ENE | 2% |
| Wednesday Night | 51°F | Partly Cloudy | 3 mph E | 6% |
| Thursday | 65°F | Slight Chance Rain Showers | 5 mph ESE | 23% |
| Thursday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph ESE | 19% |
| Friday | 66°F | Slight Chance Rain Showers then Partly Sunny | 2 to 6 mph ESE | 19% |
| Friday Night | 56°F | Mostly Cloudy | 5 mph ESE | 12% |
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 Sep 19, 2026.