Derby, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Derby, a city in Lucas County, Iowa.
Today
87°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Partly sunny. High near 87, with temperatures falling to around 85 in the afternoon. West wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Derby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 6 mph W | 27% |
| Tonight | 64°F | Showers And Thunderstorms | 8 mph NNE | 78% |
| Wednesday | 74°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 8 mph NE | 79% |
| Wednesday Night | 59°F | Showers And Thunderstorms Likely | 3 to 8 mph NE | 57% |
| Thursday | 81°F | Chance Showers And Thunderstorms then Mostly Sunny | 3 mph ENE | 32% |
| Thursday Night | 61°F | Mostly Clear | 3 mph ESE | 5% |
| Friday | 85°F | Sunny | 6 mph S | 7% |
| Friday Night | 67°F | Mostly Clear | 6 mph S | 14% |
| Saturday | 89°F | Sunny | 6 to 10 mph SSW | 6% |
| Saturday Night | 72°F | Mostly Clear | 12 to 15 mph SSW | 10% |
| Sunday | 91°F | Mostly Sunny | 15 mph SSW | 10% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 12 to 15 mph S | 20% |
| Monday | 91°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 13 to 16 mph SSW | 20% |
| Monday Night | 72°F | Chance Showers And Thunderstorms | 15 mph S | 26% |
Forecast source: National Weather Service (api.weather.gov) for Derby (40.930, -93.457). Updated through the day.
Growing snapshot for Derby
Last spring frost
May 5
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5b
More local growing data for Derby: nearby ZIP 50068 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Chariton 1 E, Ia (10.8 mi from Derby). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.