Merrill, IA Weather & Growing Conditions
Today
70°F
Patchy Fog then Cloudy
Patchy fog and a slight chance of rain showers before 9am. Cloudy. High near 70, with temperatures falling to around 66 in the afternoon. North wind 5 to 10 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Patchy Fog then Cloudy | 5 to 10 mph N | 21% |
| Tonight | 58°F | Cloudy | 10 mph NNE | 13% |
| Sunday | 64°F | Cloudy then Chance Rain Showers | 10 to 15 mph NE | 26% |
| Sunday Night | 54°F | Rain Showers Likely | 10 mph ENE | 59% |
| Monday | 60°F | Rain Showers Likely | 10 mph ENE | 61% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph ENE | 36% |
| Tuesday | 62°F | Partly Sunny | 5 mph E | 5% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph SE | 6% |
| Wednesday Night | 52°F | Mostly Cloudy then Chance Rain Showers | 5 mph SE | 26% |
| Thursday | 67°F | Chance Rain Showers | 5 to 10 mph SE | 30% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 5 mph SE | 16% |
| Friday | 69°F | Slight Chance Rain Showers | 5 to 10 mph SE | 16% |
| Friday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph SE | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Merrill, IA
Last spring frost
Apr 30
First fall frost
Oct 4
Growing season
157 days
Hardiness zone
5a
Explore more for Merrill, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Le Mars, Ia (10.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.