Treynor, IA Weather & Growing Conditions
Tonight
43°F
Rain Showers Likely then Cloudy
Rain showers likely before 11pm. Cloudy. Low around 43, with temperatures rising to around 46 overnight. Northwest wind 15 to 22 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 43°F | Rain Showers Likely then Cloudy | 15 to 22 mph NW | 63% |
| Wednesday | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 13 to 17 mph WNW | 19% |
| Wednesday Night | 41°F | Mostly Cloudy then Slight Chance Rain Showers | 12 mph WNW | 23% |
| Thursday | 51°F | Chance Rain Showers | 13 mph NW | 33% |
| Thursday Night | 38°F | Mostly Cloudy | 7 to 10 mph NNW | 5% |
| Friday | 52°F | Partly Sunny | 2 to 7 mph N | 3% |
| Friday Night | 35°F | Mostly Cloudy | 3 mph ESE | 0% |
| Saturday | 57°F | Mostly Sunny | 6 mph SW | 3% |
| Saturday Night | 38°F | Mostly Clear | 5 mph W | 5% |
| Sunday | 61°F | Sunny | 6 mph WSW | 4% |
| Sunday Night | 41°F | Mostly Clear | 8 mph SSW | 0% |
| Monday | 65°F | Sunny | 8 to 12 mph SW | 0% |
| Monday Night | 42°F | Mostly Clear | 7 mph NW | 0% |
| Tuesday | 63°F | Mostly Sunny | 7 mph ENE | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Treynor, IA
Last spring frost
Apr 23
First fall frost
Oct 14
Growing season
174 days
Hardiness zone
5b
Explore more for Treynor, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Oakland, Ia (12.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.