Derby, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Derby, a city in Lucas County, Iowa.
Today
85°F
Partly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of rain showers between 3pm and 4pm, then a slight chance of showers and thunderstorms between 4pm and 5pm. Partly sunny. High near 85, with temperatures falling to around 82 in the afternoon. West southwest wind 7 to 12 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Derby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 7 to 12 mph WSW | 17% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 to 7 mph NNW | 70% |
| Sunday | 67°F | Chance Rain Showers then Chance Showers And Thunderstorms | 7 to 10 mph NNE | 47% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 mph NE | 65% |
| Monday | 59°F | Rain Showers Likely | 12 mph NE | 65% |
| Monday Night | 52°F | Chance Rain Showers | 7 to 10 mph NE | 49% |
| Tuesday | 58°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 26% |
| Tuesday Night | 46°F | Partly Cloudy | 6 mph NE | 4% |
| Wednesday | 62°F | Sunny | 5 mph ENE | 2% |
| Wednesday Night | 51°F | Partly Cloudy | 3 mph E | 6% |
| Thursday | 65°F | Slight Chance Rain Showers | 3 mph ESE | 17% |
| Thursday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 2 mph E | 16% |
| Friday | 67°F | Slight Chance Rain Showers then Partly Sunny | 2 to 6 mph E | 16% |
| Friday Night | 56°F | Mostly Cloudy | 3 mph ESE | 9% |
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 Sep 19, 2026.