Grinnell, KS Weather & Growing Conditions
Tonight
65°F
Slight Chance Showers And Thunderstorms then Mostly Cloudy
A slight chance of showers and thunderstorms between 9pm and 11pm. Mostly cloudy. Low around 65, with temperatures rising to around 67 overnight. West wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 10 mph W | 17% |
| Saturday | 84°F | Mostly Cloudy | 5 to 10 mph N | 12% |
| Saturday Night | 60°F | Mostly Cloudy then Showers And Thunderstorms Likely | 10 mph NE | 56% |
| Sunday | 72°F | Chance Showers And Thunderstorms | 10 mph NE | 42% |
| Sunday Night | 57°F | Chance Rain Showers | 0 to 10 mph NE | 35% |
| Monday | 73°F | Chance Rain Showers then Partly Sunny | 5 mph N | 35% |
| Monday Night | 55°F | Partly Cloudy | 5 to 10 mph E | 11% |
| Tuesday | 71°F | Partly Sunny | 5 to 10 mph SE | 11% |
| Tuesday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 10 mph SE | 24% |
| Wednesday | 75°F | Chance Rain Showers | 10 to 15 mph S | 28% |
| Wednesday Night | 60°F | Chance Rain Showers | 10 to 15 mph S | 50% |
| Thursday | 76°F | Chance Rain Showers | 10 mph S | 50% |
| Thursday Night | 60°F | Chance Rain Showers | 5 to 10 mph SE | 35% |
| Friday | 76°F | Chance Rain Showers | 10 mph SE | 35% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grinnell, KS
Last spring frost
May 6
First fall frost
Oct 9
Growing season
156 days
Hardiness zone
6a
Explore more for Grinnell, KS: full frost dates · planting calendar · Kansas frost dates
Climate data from the nearest NOAA station, Oakley 4W, Ks (17.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.