Duluth, MN weather in August
Duluth is mild in August, with some rain: highs average 75°F and nights drop to about 58°F. Expect about 10 wet days. This is the peak of the warm season in Duluth. A great month for outdoor plans.
- Normal high
- 75°F
- Normal low
- 58°F
- Wet days
- 10
- 3.9 in total
- Muggy days
- 2
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 77°F | 72°F |
| Normal low | 60°F | 55°F |
| Chance of a wet day | 31% | 32% |
| Sunrise / sunset | 5:48 am / 8:40 pm | 6:27 am / 7:50 pm |
| Daylight | 14.9 h | 13.4 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical August day
- 6 am58°Fdew point 55°F
- 9 am66°Fdew point 57°F
- Noon71°Fdew point 56°F
- 3 pm73°Fdew point 56°F
- 6 pm70°Fdew point 56°F
- 9 pm63°Fdew point 56°F
NOAA hourly normals (local standard time) from Duluth (6 mi away); average wind 8 mph; clear or few clouds in 46% of daytime hours, mostly cloudy or overcast in 32%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F16 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph5 of 31
- Hot dayshigh 90°F or more1 of 31
- Muggy daysdaily mean dew point 65°F or more2 of 31
- Wet daysat least 0.01 in of rain or melted snow10 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 3.9 in; a dry August brings about 2.5 in and a wet one about 5.1 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202011: average high 79°F
- Coolest August2004: average high 69°F
- Wettest August2010: 8.9 in
- Driest August2006: 0.6 in
- Highest reading96°F (August 6, 2001)
- Lowest reading37°F (August 30, 2005)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 76°F | 75°F | 67°F |
| Normal low | 58°F | 58°F | 50°F |
| Wet days | 10 | 10 | 10 |
| Comfortable days | 11 | 16 | 13 |
| Daylight | 15.4 h | 14.2 h | 12.6 h |
Highs change by -1°F from July and -8°F into September.
Nearby alternatives in August
- Warmer: Minneapolis, MN136 mi · high 81°F · 10 wet days
How Duluth ranks in August
- Normal high354th warmest of 378 cities; 3rd of 3 in Minnesota
- Wet days236th driest of 378
- Comfortable days26th most of 341
What to pack for Duluth in August
- A rain jacket or umbrella – rain on about 10 days
- Sunglasses and sunscreen – about 14.2 hours of daylight and highs near 75°F
Heating and cooling
August has 52 heating degree days and 95 cooling degree days (base 65°F), 2% of the year's total heating and cooling demand.
Questions
How hot is Duluth in August?
The normal high is 75°F and the normal low is 58°F. From 1991 to 2020 the hottest August reading was 96°F (most recently on August 6, 2001).
Does it rain a lot in Duluth in August?
About 10 days in August have at least 0.01 in of precipitation, and the normal total is 3.9 in. The wettest August in 1991-2020 was in 2010 (8.9 in); the driest was in 2006 (0.6 in).
Is August a good time to visit Duluth?
August ranks 1st of 12 months on our comfort score for Duluth (73 out of 100). It has about 16 comfortable days and about 1 day at 90°F or hotter. The best month is August.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Superior (USC00478349), 4.2 mi SSE of the city center, 607 ft (93 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Duluth (USW00014913), 6.1 mi NW of the city center, 1,428 ft (728 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Duluth International Airport (727450-14913), 5.7 mi NW of the city center, 1,422 ft (722 ft higher than the city). Hourly observations, 1991-2020.