Duluth, Minnesota Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Duluth weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——73°46°—
- ThursdayJun 4Heavy Rain36%1.7″71°56°-2°
- FridayJun 5Light Showers28%—74°58°+3°
- SaturdayJun 6Foggy——60°49°-14°
- SundayJun 7Foggy——64°47°+4°
- MondayJun 8Light Drizzle42%0.01″62°51°-2°
- TuesdayJun 9Foggy34%—67°55°+5°
Ozone at AQI 66 now. AQI flat over the last 6 hours (within ±4 points). With UV 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 68 by mid-afternoon.
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 66 now. With UV 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 68 by mid-afternoon.
- Present
- AQI 66
- UV peak
- 7.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 68
PM × Wind × Precip
PM2.5 at 6.4 µg/m³ (AQI 36) with a 1.00 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 1.00
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 4:30 AM
- Moonset
- 12:39 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Duluth at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: May 27 (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 3, 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 — Duluth
SPC has placed Duluth 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.