Merrill, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Merrill, a city in Plymouth County, Iowa.
Tonight
39°F
Rain Showers
Rain showers. Cloudy. Low around 39, with temperatures rising to around 42 overnight. Northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Merrill
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 39°F | Rain Showers | 15 to 20 mph NW | 91% |
| Wednesday | 48°F | Chance Rain Showers | 15 mph WNW | 53% |
| Wednesday Night | 37°F | Rain Showers Likely | 10 to 15 mph NW | 56% |
| Thursday | 49°F | Chance Rain Showers | 10 to 15 mph NNW | 25% |
| Thursday Night | 33°F | Mostly Cloudy | 0 to 10 mph N | 0% |
| Friday | 50°F | Partly Sunny | 0 mph | 0% |
| Friday Night | 32°F | Mostly Cloudy | 0 mph | 0% |
| Saturday | 57°F | Mostly Sunny | 0 to 5 mph SW | 2% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 5% |
| Sunday | 60°F | Sunny | 0 to 5 mph WSW | 3% |
| Sunday Night | 38°F | Mostly Clear | 5 mph S | 0% |
| Monday | 63°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 60°F | Mostly Sunny | 0 to 5 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Merrill (42.720, -96.252). Updated through the day.
Growing snapshot for Merrill
Last spring frost
Apr 30
First fall frost
Oct 4
Growing season
157 days
Hardiness zone
5a
More local growing data for Merrill: nearby ZIP 51038 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Le Mars, Ia (10.2 mi from Merrill). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.