Merrill, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Merrill, a city in Plymouth County, Iowa.
Tonight
65°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before midnight, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 65, with temperatures rising to around 68 overnight. North northwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Merrill
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Chance Showers And Thunderstorms | 5 to 10 mph NNW | 34% |
| Saturday | 71°F | Patchy Fog | 5 to 10 mph N | 23% |
| Saturday Night | 58°F | Slight Chance Rain Showers then Cloudy | 5 to 10 mph NNE | 20% |
| Sunday | 66°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph NE | 42% |
| Sunday Night | 54°F | Rain Showers Likely | 5 to 10 mph ENE | 61% |
| Monday | 60°F | Showers And Thunderstorms Likely | 5 to 10 mph ENE | 62% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 mph ENE | 42% |
| Tuesday | 62°F | Mostly Cloudy | 5 mph E | 5% |
| Tuesday Night | 48°F | Partly Cloudy | 0 to 5 mph ESE | 0% |
| Wednesday | 67°F | Mostly Sunny | 0 to 5 mph SE | 8% |
| Wednesday Night | 52°F | Mostly Cloudy then Chance Rain Showers | 5 mph SE | 32% |
| Thursday | 67°F | Chance Rain Showers | 5 mph SSE | 32% |
| Thursday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 18% |
| Friday | 69°F | Slight Chance Rain Showers then Partly Sunny | 0 to 10 mph SE | 18% |
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 Sep 19, 2026.