Treynor, IA Weather & Growing Conditions
Today
78°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 4pm, then patchy smoke and a chance of showers and thunderstorms between 4pm and 5pm, then patchy smoke and showers and thunderstorms likely. Partly sunny. High near 78, with temperatures falling to around 74 in the afternoon. North wind 7 to 15 mph, with gusts as high as 21 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 |
|---|---|---|---|---|
| Today | 78°F | Slight Chance Showers And Thunderstorms | 7 to 15 mph N | 60% |
| Tonight | 61°F | Patchy Smoke | 7 to 15 mph NNE | 83% |
| Wednesday | 75°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph NE | 59% |
| Wednesday Night | 57°F | Mostly Clear | 2 to 7 mph ENE | 6% |
| Thursday | 80°F | Sunny | 2 to 7 mph ESE | 0% |
| Thursday Night | 64°F | Mostly Clear | 7 mph SE | 7% |
| Friday | 85°F | Mostly Sunny | 8 mph S | 8% |
| Friday Night | 67°F | Mostly Clear | 7 mph SSE | 12% |
| Saturday | 87°F | Mostly Sunny | 6 to 13 mph SSE | 10% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms | 9 to 13 mph SSE | 27% |
| Sunday | 88°F | Chance Showers And Thunderstorms then Mostly Sunny | 8 to 13 mph SSE | 27% |
| Sunday Night | 73°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 15 mph SSE | 20% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 14 mph SSW | 20% |
| Monday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 14 mph SE | 18% |
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 Aug 4, 2026.