Delmar, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Delmar, a city in Clinton County, Iowa.
Tonight
52°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5am. Mostly cloudy. Low around 52, with temperatures rising to around 55 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
7-day forecast for Delmar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Showers And Thunderstorms Likely | 10 to 15 mph S | 74% |
| Wednesday | 55°F | Chance Rain Showers | 15 mph SW | 35% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 10 to 15 mph SW | 21% |
| Thursday | 53°F | Chance Rain Showers | 5 to 10 mph W | 54% |
| Thursday Night | 42°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph NW | 24% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 9% |
| Friday Night | 34°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 mph W | 11% |
| Sunday Night | 36°F | Mostly Clear | 5 mph W | 3% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Delmar (41.999, -90.608). Updated through the day.
Growing snapshot for Delmar
Last spring frost
Apr 25
First fall frost
Oct 14
Growing season
171 days
Hardiness zone
5a
More local growing data for Delmar: nearby ZIP 52037 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Andover
Calamus
Camanche
Charlotte
Clinton
DeWitt
Goose Lake
Grand Mound
Lost Nation
Low Moor
Toronto
Welton
Wheatland
Climate data from the nearest NOAA station, Maquoketa, Ia (7.8 mi from Delmar). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.