Merton, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Merton, a village in Waukesha County, Wisconsin.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Southwest wind around 10 mph.
7-day forecast for Merton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 10 mph SW | 11% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 88% |
| Wednesday | 74°F | Patchy Fog then Chance Showers And Thunderstorms | 5 mph W | 68% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 0 to 5 mph NE | 41% |
| Thursday | 78°F | Slight Chance Rain Showers then Mostly Sunny | 0 mph | 20% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 7% |
| Friday | 81°F | Sunny | 0 to 5 mph SW | 1% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph SW | 6% |
| Saturday | 83°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 29% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 29% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 52% |
| Monday | 82°F | Chance Rain Showers | 5 mph SW | 43% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 5 mph NW | 43% |
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
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 Aug 4, 2026.