Duluth weather in August: Duluth, Minnesota: normal highs, lows, rain and records for August
Duluth in August has a normal high of 76°F and a normal low of 55°F, a daily mean of 66°F, falling from 78°F on the 1st to 73°F by the 31st. Measurable precipitation falls on 11 days in a normal August, 3.73 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 13°C, 95 mm of precipitation in August.
- NOAA stationDuluth International Airport
- Station IDUSW00014913
- Location46.84°N 92.21°W
- Elevation1,428 ft (435 m)
- From the center6 miles
- Population87,986
- Jan 20° 2°
- Feb 25° 6°
- Mar 36° 18°
- Apr 49° 30°
- May 63° 41°
- Jun 72° 50°
- Jul 78° 56°
- Aug 76° 55°
- Sep 67° 47°
- Oct 53° 36°
- Nov 37° 23°
- Dec 25° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Duluth in August?
The normal high is 76°F and the normal low 55°F, for a daily mean of 65.5°F. August is 1.5°F cooler than July and 8.3°F warmer than September. August is the 2nd warmest month of the year in Duluth and the 3rd wettest. Across the month the normal high falls 5°F, from 78°F on August 1 to 73°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 63°F and 68°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 78°F | 57°F | 36% | 21% |
| August 8 | 77°F | 56°F | 36% | 21% |
| August 15 | 76°F | 56°F | 35% | 21% |
| August 22 | 75°F | 55°F | 35% | 21% |
| August 31 | 73°F | 53°F | 36% | 21% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 78°F | 57°F | 36% | 21% | 15 h |
| August 2 | 78°F | 57°F | 36% | 21% | 14 h 50 min |
| August 3 | 78°F | 57°F | 36% | 21% | 14 h 50 min |
| August 4 | 78°F | 57°F | 36% | 21% | 14 h 50 min |
| August 5 | 78°F | 57°F | 36% | 21% | 14 h 40 min |
| August 6 | 78°F | 57°F | 36% | 21% | 14 h 40 min |
| August 7 | 77°F | 57°F | 36% | 21% | 14 h 40 min |
| August 8 | 77°F | 56°F | 36% | 21% | 14 h 40 min |
| August 9 | 77°F | 56°F | 35% | 21% | 14 h 30 min |
| August 10 | 77°F | 56°F | 35% | 21% | 14 h 30 min |
| August 11 | 77°F | 56°F | 35% | 21% | 14 h 30 min |
| August 12 | 77°F | 56°F | 35% | 21% | 14 h 30 min |
| August 13 | 77°F | 56°F | 35% | 21% | 14 h 20 min |
| August 14 | 76°F | 56°F | 35% | 21% | 14 h 20 min |
| August 15 | 76°F | 56°F | 35% | 21% | 14 h 20 min |
| August 16 | 76°F | 56°F | 35% | 21% | 14 h 10 min |
| August 17 | 76°F | 55°F | 35% | 21% | 14 h 10 min |
| August 18 | 76°F | 55°F | 35% | 21% | 14 h 10 min |
| August 19 | 76°F | 55°F | 35% | 21% | 14 h |
| August 20 | 75°F | 55°F | 35% | 21% | 14 h |
| August 21 | 75°F | 55°F | 35% | 21% | 14 h |
| August 22 | 75°F | 55°F | 35% | 21% | 14 h |
| August 23 | 75°F | 54°F | 35% | 21% | 13 h 50 min |
| August 24 | 75°F | 54°F | 35% | 21% | 13 h 50 min |
| August 25 | 74°F | 54°F | 35% | 21% | 13 h 50 min |
| August 26 | 74°F | 54°F | 35% | 21% | 13 h 40 min |
| August 27 | 74°F | 54°F | 35% | 21% | 13 h 40 min |
| August 28 | 74°F | 53°F | 35% | 21% | 13 h 40 min |
| August 29 | 73°F | 53°F | 36% | 21% | 13 h 30 min |
| August 30 | 73°F | 53°F | 36% | 21% | 13 h 30 min |
| August 31 | 73°F | 53°F | 36% | 21% | 13 h 30 min |
- Normal high
- 76°FAugust average
- Normal low
- 55°FAugust average
- Precipitation
- 3.73 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 15 h to 13 h 30 minAugust 1 to August 31
- Days at 70°F or more
- 25
- Days at 80°F or more
- 8
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014913; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Duluth in August?
On a given August day the chance of 0.01 inch or more is 35% on average, highest around August 1 (36%). In all, 3.73 in falls on 11 days of a normal August, 1 of them with an inch or more.
In a normal August in Duluth, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014913.
How humid and windy is Duluth in August?
At 3 p.m. the normal temperature is 71°F with 57% relative humidity and a dew point of 55°F; at 6 a.m. it is 56°F with 89% humidity. The wind averages 9.0 mph, most often from the southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 56°F | 53°F | 89% | 7.5 mph | 49% |
| 9 a.m. | 64°F | 55°F | 73% | 10.2 mph | 54% |
| noon | 69°F | 55°F | 61% | 11.2 mph | 41% |
| 3 p.m. | 71°F | 55°F | 57% | 11.6 mph | 50% |
| 6 p.m. | 67°F | 55°F | 65% | 8.9 mph | 58% |
| 9 p.m. | 60°F | 54°F | 81% | 7.3 mph | 67% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014913. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Duluth?
The warmest August temperature on Duluth's official record (since 1874) is 97°F, on August 1, 1930; the coldest is 32°F, on August 27, 1986. The wettest August brought 10.31 in (1972).
The August mean against the 1991-2020 normal of 65.5°F: 2021 68.6°F (+3.1), 2022 65.5°F (at normal), 2023 65.6°F (+0.1), 2024 66.2°F (+0.7), 2025 65.1°F (−0.4), 2026 65.2°F (−0.3). 3 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.6°F | +3.1°F | 2.44 in |
| 2022 | 65.5°F | at normal | 3.69 in |
| 2023 | 65.6°F | +0.1°F | 1.68 in |
| 2024 | 66.2°F | +0.7°F | 3.48 in |
| 2025 | 65.1°F | −0.4°F | 1.53 in |
| 2026 | 65.2°F | −0.3°F | 2.30 in |
Source: records: ACIS, NWS threaded record DLHthr; recent months: ACIS, station USW00014913. Records and recent months use complete months only.
How does August in Duluth compare across Minnesota?
Across the 129 places PlainClimate covers in Minnesota, August normal highs run from 70°F in Grand Marais to 82°F in Little Falls; Duluth's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.