Oskaloosa, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oskaloosa, a city in Mahaska County, Iowa.
Today
88°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 3pm. Mostly sunny. High near 88, with temperatures falling to around 85 in the afternoon. West southwest wind around 6 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 |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 mph WSW | 22% |
| Tonight | 65°F | Showers And Thunderstorms | 8 mph NNE | 91% |
| Wednesday | 76°F | Showers And Thunderstorms | 7 mph NNE | 76% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 3 to 7 mph NNE | 55% |
| Thursday | 82°F | Chance Rain Showers then Mostly Sunny | 3 mph ENE | 26% |
| Thursday Night | 61°F | Mostly Clear | 2 mph ESE | 2% |
| Friday | 86°F | Sunny | 5 mph SSE | 6% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 6 mph SSE | 15% |
| Saturday | 89°F | Sunny then Slight Chance Rain Showers | 3 to 7 mph SSW | 15% |
| Saturday Night | 72°F | Slight Chance Rain Showers then Mostly Clear | 10 mph SSW | 15% |
| Sunday | 91°F | Sunny | 12 mph SSW | 11% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph S | 29% |
| Monday | 91°F | Chance Showers And Thunderstorms then Mostly Sunny | 12 mph SSW | 29% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 13 mph S | 29% |
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 Aug 4, 2026.