Oskaloosa, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oskaloosa, a city in Mahaska County, Iowa.
This Afternoon
84°F
Slight Chance Showers And Thunderstorms
A slight chance of rain showers before 4pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 84, with temperatures falling to around 82 in the afternoon. Southwest wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Oskaloosa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Slight Chance Showers And Thunderstorms | 8 mph SW | 22% |
| Tonight | 64°F | Showers And Thunderstorms Likely | 3 to 7 mph NNW | 81% |
| Sunday | 67°F | Chance Showers And Thunderstorms then Chance Drizzle | 7 to 13 mph NNE | 47% |
| Sunday Night | 58°F | Rain Showers Likely | 13 mph NE | 58% |
| Monday | 61°F | Rain Showers | 12 mph NE | 82% |
| Monday Night | 54°F | Rain Showers Likely | 10 mph NE | 64% |
| Tuesday | 60°F | Slight Chance Rain Showers | 9 mph NE | 19% |
| Tuesday Night | 49°F | Partly Cloudy | 7 mph NE | 5% |
| Wednesday | 63°F | Mostly Sunny | 6 mph NE | 1% |
| Wednesday Night | 53°F | Partly Cloudy | 3 mph ENE | 0% |
| Thursday | 66°F | Slight Chance Rain Showers | 2 mph ESE | 15% |
| Thursday Night | 57°F | Slight Chance Rain Showers | 2 mph E | 21% |
| Friday | 69°F | Slight Chance Rain Showers | 5 mph E | 21% |
| Friday Night | 59°F | Mostly Cloudy | 3 mph E | 8% |
Forecast source: National Weather Service (api.weather.gov) for Oskaloosa (41.292, -92.641). Updated through the day.
Growing snapshot for Oskaloosa
Last spring frost
Apr 21
First fall frost
Oct 16
Growing season
176 days
Hardiness zone
5b
More local growing data for Oskaloosa: nearby ZIP 52595 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Oskaloosa, Ia (2.8 mi from Oskaloosa). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.