Lannon, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lannon, a village in Waukesha County, Wisconsin.
This Afternoon
70°F
Light Rain Likely
Rain before 3pm, then rain likely and a slight chance of thunderstorms. Cloudy, with a high near 70. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lannon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Light Rain Likely | 15 to 20 mph S | 95% |
| Tonight | 57°F | Light Rain | 10 to 15 mph S | 86% |
| Wednesday | 63°F | Light Rain | 10 to 15 mph S | 85% |
| Wednesday Night | 47°F | Chance Light Rain | 10 to 15 mph SW | 41% |
| Thursday | 55°F | Light Rain Likely | 5 to 15 mph W | 63% |
| Thursday Night | 40°F | Chance Light Rain | 5 to 10 mph NW | 53% |
| Friday | 49°F | Slight Chance Light Rain | 10 to 15 mph N | 24% |
| Friday Night | 34°F | Mostly Cloudy | 0 to 5 mph N | 6% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 8% |
| Sunday | 57°F | Slight Chance Light Rain | 5 to 10 mph W | 18% |
| Sunday Night | 36°F | Partly Cloudy | 5 mph W | 5% |
| Monday | 59°F | Mostly Sunny | 5 to 15 mph SW | 2% |
| Monday Night | 40°F | Partly Cloudy | 5 to 10 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov) for Lannon (43.157, -88.158). Updated through the day.
Growing snapshot for Lannon
Last spring frost
Apr 30
First fall frost
Oct 16
Growing season
167 days
Hardiness zone
5b
More local growing data for Lannon: nearby ZIP 53046 weather · frost dates · planting calendar · Wisconsin frost dates
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Climate data from the nearest NOAA station, Richfield 3 Ssw, Wi (4.5 mi from Lannon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.