Harman US

Siren, WI Weather & Growing Conditions

Tonight
50°F
Rain Showers Likely
Rain showers likely before 11pm, then a chance of rain showers and patchy fog between 11pm and 1am, then a chance of drizzle and patchy fog. Cloudy, with a low around 50. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Tonight 50°F Rain Showers Likely 5 to 10 mph E 59%
Saturday 64°F Chance Drizzle then Cloudy 5 to 10 mph NE 27%
Saturday Night 47°F Mostly Cloudy 5 to 10 mph NE 3%
Sunday 68°F Partly Sunny 5 to 10 mph NE 0%
Sunday Night 41°F Mostly Cloudy 5 to 10 mph NE 0%
Monday 65°F Partly Sunny 5 mph E 0%
Monday Night 39°F Partly Cloudy 0 to 5 mph NE 1%
Tuesday 66°F Mostly Sunny 0 to 5 mph E 1%
Tuesday Night 40°F Mostly Clear 0 to 5 mph SE 1%
Wednesday 68°F Sunny 0 to 5 mph SE 0%
Wednesday Night 44°F Partly Cloudy 0 to 5 mph E 7%
Thursday 70°F Mostly Sunny 0 to 5 mph S 10%
Thursday Night 46°F Partly Cloudy 0 mph 7%
Friday 72°F Mostly Sunny 0 to 5 mph SE 5%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Siren, WI

Last spring frost
May 11
First fall frost
Oct 1
Growing season
141 days
Hardiness zone
4b

Explore more for Siren, WI: full frost dates · planting calendar · Wisconsin frost dates

Climate data from the nearest NOAA station, Grantsburg, Wi (14.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.