Derby, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Derby, a city in Lucas County, Iowa.
Overnight
46°F
Slight Chance Rain Showers
A slight chance of rain showers after 5am. Cloudy. Low around 46, with temperatures rising to around 48 overnight. West northwest wind around 14 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast for Derby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Slight Chance Rain Showers | 14 mph WNW | 16% |
| Wednesday | 52°F | Slight Chance Rain Showers then Cloudy | 12 to 16 mph W | 18% |
| Wednesday Night | 43°F | Mostly Cloudy then Slight Chance Rain Showers | 10 mph W | 20% |
| Thursday | 53°F | Chance Rain Showers | 8 to 12 mph NW | 28% |
| Thursday Night | 41°F | Mostly Cloudy | 8 mph NNW | 14% |
| Friday | 49°F | Partly Sunny | 3 to 8 mph N | 6% |
| Friday Night | 30°F | Partly Cloudy | 2 mph N | 0% |
| Saturday | 52°F | Mostly Sunny | 3 mph WSW | 1% |
| Saturday Night | 35°F | Mostly Clear | 5 mph WSW | 1% |
| Sunday | 59°F | Sunny | 5 mph W | 1% |
| Sunday Night | 37°F | Clear | 5 mph SW | 0% |
| Monday | 64°F | Sunny | 5 to 9 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 64°F | Sunny | 5 mph NNW | 0% |
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 Nov 4, 2026.