Superior, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Superior, a city in St. Louis County, Wisconsin.
Tonight
47°F
Slight Chance Drizzle
A slight chance of drizzle before 1am, then patchy fog and a slight chance of drizzle. Cloudy. Low around 47, with temperatures rising to around 49 overnight. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Superior
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Slight Chance Drizzle | 5 to 10 mph NE | 24% |
| Saturday | 61°F | Patchy Fog then Mostly Cloudy | 5 to 10 mph NE | 19% |
| Saturday Night | 45°F | Mostly Cloudy | 5 mph NE | 2% |
| Sunday | 59°F | Partly Sunny | 10 to 15 mph NE | 0% |
| Sunday Night | 39°F | Mostly Cloudy | 5 to 10 mph E | 0% |
| Monday | 59°F | Mostly Sunny | 5 to 15 mph E | 0% |
| Monday Night | 38°F | Partly Cloudy | 0 to 15 mph E | 0% |
| Tuesday | 60°F | Sunny | 0 to 15 mph E | 0% |
| Tuesday Night | 38°F | Mostly Clear | 0 to 10 mph E | 0% |
| Wednesday | 63°F | Sunny | 0 to 10 mph E | 0% |
| Wednesday Night | 40°F | Partly Cloudy | 0 to 5 mph E | 4% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph SE | 9% |
| Thursday Night | 44°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Superior (46.692, -92.080). Updated through the day.
Growing snapshot for Superior
Last spring frost
May 14
First fall frost
Oct 12
Growing season
149 days
Hardiness zone
5a
More local growing data for Superior: nearby ZIP 55802 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Duluth Harbor Stn, Mn (0.5 mi from Superior). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.