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Best time to visit · Minnesota, United States
June – September are the best time to visit Duluth on the climate data: September scores 86/100, with highs around 69°F (20°C) and 3.2 in (82 mm) of rain. May is a good shoulder-season month. The toughest months are March and November & December, mainly because of cool days.
Highs run from 20°F to 78°F across the year, and the yearly total is about 30.8 in (782 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 20°F-7°C | 23°F-5°C | 36°F2°C | 49°F9°C | 60°F16°C | 70°F21°C | 78°F26°C | 77°F25°C | 69°F20°C | 53°F12°C | 39°F4°C | 26°F-4°C |
| Avg low | 5°F-15°C | 6°F-14°C | 20°F-7°C | 32°F0°C | 42°F5°C | 52°F11°C | 60°F16°C | 59°F15°C | 51°F11°C | 38°F3°C | 26°F-3°C | 13°F-10°C |
| Rain/snow | 0.9 in23 mm | 1.1 in27 mm | 1.6 in41 mm | 2.8 in72 mm | 3.6 in91 mm | 4.1 in104 mm | 3.5 in89 mm | 3.5 in90 mm | 3.2 in82 mm | 3.2 in81 mm | 1.6 in40 mm | 1.7 in42 mm |
| Humidity | 96% | 93% | 85% | 77% | 77% | 79% | 74% | 72% | 75% | 80% | 85% | 93% |
| Cloud | 63% | 59% | 62% | 64% | 65% | 61% | 51% | 52% | 56% | 64% | 69% | 71% |
| Comfort | 49 | 50 | 49 | 58 | 75 | 82 | 84 | 85 | 86 | 64 | 47 | 46 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. Temperatures were adjusted from the grid cell's ~354 m (1,161 ft) to Duluth's ~200 m (656 ft) elevation using the standard lapse rate of 6.5°C per 1,000 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The coldest season, with highs of 20–26°F (-7–-4°C) and lows down to 5°F (-15°C). It's the driest season, with only about 3.6 in (92 mm) of rain or snow, 12% of the year's total. December – February are cold enough for snow. It holds the toughest stretch on our comfort score (December), averaging 48/100.
Temperatures climb through the season, from 36°F highs in March to 60°F by May. About 8.0 in (204 mm) of rain or snow falls across these months, 26% of the year's total. March is cold enough for snow. Comfort scores bottom out in March; the season averages 61/100.
The warmest stretch of the year, with highs of 70–78°F (21–26°C). It's the wettest season, with about 11.1 in (283 mm) of rain, 36% of the year's total. Lows bottom out around 52°F (11°C). Comfort peaks here: June – August rank with the year's best, and the season averages 84/100.
Temperatures slide from 69°F highs in September to 39°F by November. About 8.0 in (203 mm) of rain or snow falls across these months, 26% of the year's total. November is cold enough for snow. September is among the best-scoring months (season average 66/100).
By comfort score: 5 Great, 1 Good and 6 Fair. Great months: May – September. Tap a month for its own guide.
June – September are the best time to visit Duluth on the climate data: September scores 86/100, with highs around 69°F (20°C) and 3.2 in (82 mm) of rain. May is a good shoulder-season month. The toughest months are March and November & December, mainly because of cool days.
June is the wettest month, averaging about 4.1 in (104 mm) of rain. January is the driest, with about 0.9 in (23 mm). The yearly total is around 30.8 in (782 mm).
January is the coldest, with average lows of 5°F (-15°C) and highs of 20°F (-7°C). The warmest is July, with average highs of 78°F (26°C).
Not very: summer (June – August) humidity averages 75%, and highs peak around 78°F (26°C), so it rarely feels sticky.
On average, yes: lows fall below 32°F (0°C) in November – April, bottoming out around 5°F (-15°C) in January.
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