Grantsburg, Wisconsin Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Grantsburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Foggy30%—81°61°—
- SundayJul 5Overcast19%—84°62°+3°
- MondayJul 6Overcast17%—85°63°+1°
- TuesdayJul 7T-storm w/ Hail35%0.61″89°67°+4°
- WednesdayJul 8Heavy Showers56%1.1″75°63°-14°
- ThursdayJul 9Light Drizzle54%—80°58°+5°
- FridayJul 10Thunderstorm—0.06″82°57°+2°
AQI 51 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.3 µg/m³ (AQI 53) with a 0.76 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 43 now. With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 34 around 1 PM.
- Present
- AQI 43
- UV peak
- 6.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 34
PM × Wind × Precip
PM2.5 at 10.3 µg/m³ (AQI 53) with a 0.76 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.76
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:15 PM
- Moonset
- 10:10 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Grantsburg at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: May 21 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 54840
16-Day Forecast — Grantsburg
- Sat81°61°30%
- Sun84°62°19%
- Mon85°63°17%
- Tue89°67°35%
- Wed75°63°56%
- Thu80°58°54%
- Fri82°57°9%
- Sat69°59°11%
- Sun75°55°15%
- Mon78°54°8%
- Tue80°58°7%
- Wed80°62°12%
- Thu82°58°10%
- Fri88°62°21%
- Sat87°61°23%
- Sun91°71°24%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 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 includes Grantsburg in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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.
ZIP codes in Grantsburg
- 54840