Siren, WI Weather & Growing Conditions
This Afternoon
59°F
Light Rain
Rain and patchy fog. Mostly cloudy. High near 59, with temperatures falling to around 55 in the afternoon. Northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Light Rain | 10 mph NE | 80% |
| Tonight | 51°F | Rain | 5 to 10 mph NE | 83% |
| Wednesday | 56°F | Rain | 5 to 10 mph NE | 76% |
| Wednesday Night | 41°F | Light Rain | 5 to 10 mph N | 78% |
| Thursday | 47°F | Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 41% |
| Thursday Night | 30°F | Mostly Cloudy | 0 to 10 mph NE | 1% |
| Friday | 45°F | Partly Sunny | 0 to 5 mph NE | 0% |
| Friday Night | 26°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 50°F | Mostly Sunny | 0 to 5 mph SW | 1% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 5 mph SW | 11% |
| Sunday | 54°F | Mostly Sunny | 5 to 10 mph W | 10% |
| Sunday Night | 32°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Monday | 56°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 34°F | Mostly Clear | 0 to 5 mph W | 0% |
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 Nov 4, 2026.