Climate averages 1991–2020
Duluth weather
in August.
A warm, wet month: the 2nd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Duluth: daytime highs average 23.6°C and nights cool to about 17.8°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 102 mm of rain on roughly 11 days, which makes August a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 13 min on an average August day.
The nearest other city in this atlas is Brooklyn Park (211 km away). In August its highs average 26.0°C, 2.4°C warmer than Duluth, with 98 mm of rain.
Among the 498 cities listed in the United States, Duluth ranks joint 490th of 498 for the warmest August highs and joint 411th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Duluth is 6.3°C cooler than that mean.
From August to September, average highs fall by 4.2°C to 19.5°C, and monthly rainfall falls from 102 mm to 92 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Duluth climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -7.2°C-13.9°C | -13.9°C | 26 | 6.3 | 9.09 h |
| February | -5.2°C-12.0°C | -12.0°C | 28 | 5.4 | 10.310 h |
| March | 0.5°C-6.1°C | -6.1°C | 49 | 7.3 | 11.912 h |
| April | 6.5°C-0.2°C | -0.2°C | 84 | 10.2 | 13.614 h |
| May | 13.4°C6.5°C | 6.5°C | 97 | 11.1 | 15.015 h |
| June | 19.6°C13.2°C | 13.2°C | 105 | 11.6 | 15.816 h |
| July | 23.9°C17.8°C | 17.8°C | 98 | 11.7 | 15.515 h |
| August, selected | 23.6°C17.8°C | 17.8°C | 102 | 10.5 | 14.214 h |
| September | 19.5°C13.8°C | 13.8°C | 92 | 10.6 | 12.613 h |
| October | 11.6°C6.6°C | 6.6°C | 103 | 10.8 | 10.911 h |
| November | 3.6°C-1.1°C | -1.1°C | 66 | 8.9 | 9.49 h |
| December | -3.2°C-8.8°C | -8.8°C | 45 | 7.5 | 8.69 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Brooklyn Park in AugustUnited States · 211 kmHigh 26.0°C · Low 17.5°C · 98 mm rain
- Saint Paul in AugustUnited States · 218 kmHigh 26.1°C · Low 17.6°C · 98 mm rain
- Minneapolis in AugustUnited States · 220 kmHigh 26.2°C · Low 17.6°C · 98 mm rain
- Plymouth, United States in AugustUnited States · 223 kmHigh 25.9°C · Low 17.5°C · 99 mm rain
- Bloomington (Minnesota), United States in AugustUnited States · 235 kmHigh 26.2°C · Low 18.0°C · 99 mm rain
- Thunder Bay in AugustCanada · 278 kmHigh 22.3°C · Low 15.6°C · 67 mm rain
- Rochester (Minnesota), United States in AugustUnited States · 308 kmHigh 25.4°C · Low 17.0°C · 96 mm rain
- Fargo in AugustUnited States · 356 kmHigh 25.9°C · Low 16.1°C · 82 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Duluth) is explained once on the Duluth year overview and on the Sources, method and limits page.