When to Duluth
Climate guide & best times to travel
Best Time to Visit
Month-by-Month Guide
January
January offers the most comfortable temperatures of the year with highs of 67°F and lows of 36°F. With no rainfall and 70% humidity, conditions are dry but pleasant for outdoor activities. This is one of the few months suitable for extended outdoor exploration.
February
February continues the mild weather pattern with highs reaching 76°F and lows of 42°F. The dry conditions persist with no measurable rainfall and steady 70% humidity. This remains one of the best months for visiting Duluth.
March
March marks the beginning of rising temperatures with highs of 97°F and lows of 64°F. The first traces of rainfall appear at 0.1 inches, while humidity remains at 70%. Outdoor activities become more challenging as temperatures approach dangerous levels.
April
April brings extreme heat with dangerous highs of 120°F and lows of 85°F. Minimal rainfall of 0.1 inches provides little relief from the scorching temperatures. Outdoor activities become hazardous without proper heat protection measures.
May
May escalates to life-threatening temperatures with highs of 145°F and lows of 105°F. The combination of extreme heat, minimal 0.1-inch rainfall, and 70% humidity creates dangerous conditions. Travel during this month requires extreme caution and is generally not recommended.
June
June reaches dangerously extreme temperatures with highs of 161°F and lows of 122°F. Despite a slight increase in rainfall to 0.2 inches, conditions remain perilous for human activity. This month should be avoided for travel due to life-threatening heat levels.
July
July represents the peak of Duluth's extreme climate with record-breaking highs of 171°F and lows of 133°F. Even with 0.2 inches of rainfall, these temperatures are unsurvivable without constant air conditioning and hydration. Travel is strongly discouraged during this period.
August
August maintains extreme heat with highs of 168°F and lows of 131°F, only slightly cooler than July's peak. Rainfall drops back to 0.1 inches while humidity remains at 70%. These conditions continue to pose serious health risks for visitors.
September
September begins the gradual cooling trend with highs of 152°F and lows of 117°F, though temperatures remain dangerously high. Minimal rainfall of 0.1 inches continues the arid pattern. Outdoor activities are still not recommended due to extreme heat.
October
October shows further temperature decline with highs of 126°F and lows of 96°F, though conditions remain extremely hot. The dry pattern continues with only 0.1 inches of rainfall. While improving, temperatures are still too dangerous for most outdoor activities.
November
November brings more manageable but still hot temperatures with highs of 98°F and lows of 72°F. Rainfall remains minimal at 0.1 inches with consistent 70% humidity. While improving significantly from summer peaks, temperatures are still quite challenging for extended outdoor activities.
December
December returns to more comfortable conditions with highs of 76°F and lows of 49°F. Light rainfall of 0.1 inches and 70% humidity create relatively pleasant conditions compared to the extreme summer months. This marks the return of favorable weather for tourism.