Merton, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Merton, a village in Waukesha County, Wisconsin.
Overnight
58°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 58. Southeast wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Merton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Showers And Thunderstorms | 5 mph SE | 100% |
| Saturday | 67°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph E | 100% |
| Saturday Night | 59°F | Showers And Thunderstorms | 5 to 10 mph E | 84% |
| Sunday | 65°F | Chance Rain Showers then Cloudy | 10 to 15 mph NE | 42% |
| Sunday Night | 52°F | Mostly Cloudy | 10 to 15 mph NE | 2% |
| Monday | 61°F | Mostly Cloudy | 10 to 15 mph NE | 6% |
| Monday Night | 49°F | Mostly Cloudy | 5 to 10 mph NE | 5% |
| Tuesday | 60°F | Partly Sunny | 5 to 15 mph NE | 7% |
| Tuesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 63°F | Mostly Sunny | 5 to 10 mph NE | 5% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 65°F | Mostly Sunny | 0 to 5 mph NE | 4% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Merton (43.144, -88.312). Updated through the day.
Growing snapshot for Merton
Last spring frost
Apr 30
First fall frost
Oct 16
Growing season
167 days
Hardiness zone
5b
More local growing data for Merton: nearby ZIP 53029 weather · frost dates · planting calendar · Wisconsin frost dates
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Waukesha
Climate data from the nearest NOAA station, Richfield 3 Ssw, Wi (8 mi from Merton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.