Grantsburg, Wisconsin Weather
Prairie lightning bugs rise. Day 77 of spring. Read this microseason across nine climate regions →
Grantsburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Drizzle38%0.03″86°63°—
- FridayJun 5Drizzle70%—83°62°-3°
- SaturdayJun 6Clear23%—80°56°-3°
- SundayJun 7Overcast13%—83°57°+3°
- MondayJun 8Showers60%0.18″72°66°-11°
- TuesdayJun 9Drizzle43%0.07″82°66°+10°
- WednesdayJun 10Overcast23%—86°61°+4°
Ozone at AQI 47. AQI down 16 over the last 6 hours — air quality is improving sharply. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 AM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 47. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 47
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 10
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:00 AM
- Moonset
- 1:53 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Grantsburg at a glance
- Today vs. normal: 70°F — typical for the season
- Last frost: May 21 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Grantsburg
SPC has placed Grantsburg in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.