Bismarck weather in August: Bismarck, North Dakota: normal highs, lows, rain and records for August
Bismarck in August has a normal high of 84°F and a normal low of 56°F, a daily mean of 70°F, falling from 86°F on the 1st to 80°F by the 31st. Measurable precipitation falls on 8 days in a normal August, 2.50 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 13°C, 64 mm of precipitation in August.
- NOAA stationBismarck Municipal Airport
- Station IDUSW00024011
- Location46.77°N 100.76°W
- Elevation1,658 ft (505 m)
- From the center3 miles
- Population77,772
- Jan 23° 2°
- Feb 28° 7°
- Mar 41° 19°
- Apr 56° 30°
- May 68° 42°
- Jun 78° 53°
- Jul 85° 58°
- Aug 84° 56°
- Sep 73° 46°
- Oct 57° 33°
- Nov 41° 19°
- Dec 28° 8°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Bismarck in August?
The normal high is 84°F and the normal low 56°F, for a daily mean of 69.6°F. August is 1.7°F cooler than July and 9.9°F warmer than September. August is the 2nd warmest month of the year in Bismarck and the 3rd wettest. Across the month the normal high falls 6°F, from 86°F on August 1 to 80°F on August 31. From one year to the next August's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 72°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 28%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 86°F | 58°F | 28% | 17% |
| August 8 | 85°F | 58°F | 27% | 15% |
| August 15 | 84°F | 56°F | 26% | 14% |
| August 22 | 82°F | 55°F | 25% | 13% |
| August 31 | 80°F | 52°F | 25% | 12% |
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 | 86°F | 58°F | 28% | 17% | 15 h |
| August 2 | 86°F | 58°F | 28% | 16% | 14 h 50 min |
| August 3 | 86°F | 58°F | 27% | 16% | 14 h 50 min |
| August 4 | 86°F | 58°F | 27% | 16% | 14 h 50 min |
| August 5 | 86°F | 58°F | 27% | 16% | 14 h 40 min |
| August 6 | 86°F | 58°F | 27% | 16% | 14 h 40 min |
| August 7 | 86°F | 58°F | 27% | 15% | 14 h 40 min |
| August 8 | 85°F | 58°F | 27% | 15% | 14 h 40 min |
| August 9 | 85°F | 58°F | 26% | 15% | 14 h 30 min |
| August 10 | 85°F | 57°F | 26% | 15% | 14 h 30 min |
| August 11 | 85°F | 57°F | 26% | 15% | 14 h 30 min |
| August 12 | 85°F | 57°F | 26% | 14% | 14 h 30 min |
| August 13 | 85°F | 57°F | 26% | 14% | 14 h 20 min |
| August 14 | 84°F | 57°F | 26% | 14% | 14 h 20 min |
| August 15 | 84°F | 56°F | 26% | 14% | 14 h 20 min |
| August 16 | 84°F | 56°F | 26% | 14% | 14 h 10 min |
| August 17 | 84°F | 56°F | 26% | 13% | 14 h 10 min |
| August 18 | 83°F | 56°F | 26% | 13% | 14 h 10 min |
| August 19 | 83°F | 55°F | 26% | 13% | 14 h |
| August 20 | 83°F | 55°F | 26% | 13% | 14 h |
| August 21 | 83°F | 55°F | 26% | 13% | 14 h |
| August 22 | 82°F | 55°F | 25% | 13% | 14 h |
| August 23 | 82°F | 54°F | 25% | 13% | 13 h 50 min |
| August 24 | 82°F | 54°F | 25% | 12% | 13 h 50 min |
| August 25 | 82°F | 54°F | 25% | 12% | 13 h 50 min |
| August 26 | 81°F | 53°F | 25% | 12% | 13 h 40 min |
| August 27 | 81°F | 53°F | 25% | 12% | 13 h 40 min |
| August 28 | 81°F | 53°F | 25% | 12% | 13 h 40 min |
| August 29 | 80°F | 52°F | 25% | 12% | 13 h 30 min |
| August 30 | 80°F | 52°F | 25% | 12% | 13 h 30 min |
| August 31 | 80°F | 52°F | 25% | 12% | 13 h 30 min |
- Normal high
- 84°FAugust average
- Normal low
- 56°FAugust average
- Precipitation
- 2.50 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 7
- Daylight
- 15 h to 13 h 30 minAugust 1 to August 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 21
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024011; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Bismarck in August?
On a given August day the chance of 0.01 inch or more is 26% on average, highest around August 1 (28%). In all, 2.50 in falls on 8 days of a normal August, 1 of them with an inch or more.
In a normal August in Bismarck, 7 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024011.
How humid and windy is Bismarck in August?
At 3 p.m. the normal temperature is 79°F with 40% relative humidity and a dew point of 52°F; at 6 a.m. it is 56°F with 85% humidity. The wind averages 8.7 mph, most often from the south in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 56°F | 52°F | 85% | 6.2 mph | 69% |
| 9 a.m. | 65°F | 54°F | 69% | 8.7 mph | 73% |
| noon | 75°F | 54°F | 48% | 11.4 mph | 71% |
| 3 p.m. | 79°F | 52°F | 40% | 12.1 mph | 76% |
| 6 p.m. | 77°F | 52°F | 42% | 11.0 mph | 77% |
| 9 p.m. | 66°F | 53°F | 65% | 7.4 mph | 82% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024011. 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 Bismarck?
The warmest August temperature on Bismarck's official record (since 1874) is 109°F, on August 5, 1941; the coldest is 32°F, on August 31, 1895. The wettest August brought 9.29 in (1998).
The August mean against the 1991-2020 normal of 69.6°F: 2021 73.1°F (+3.5), 2022 73.6°F (+4.0), 2023 70.6°F (+1.0), 2024 68.6°F (−1.0), 2025 69.5°F (−0.1), 2026 71.0°F (+1.5). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.1°F | +3.5°F | 1.07 in |
| 2022 | 73.6°F | +4.0°F | 1.20 in |
| 2023 | 70.6°F | +1.0°F | 3.06 in |
| 2024 | 68.6°F | −1.0°F | 2.93 in |
| 2025 | 69.5°F | −0.1°F | 1.70 in |
| 2026 | 71.0°F | +1.5°F | 1.45 in |
Source: records: ACIS, NWS threaded record BISthr; recent months: ACIS, station USW00024011. Records and recent months use complete months only.
How does August in Bismarck compare across North Dakota?
Across the 92 places PlainClimate covers in North Dakota, August normal highs run from 75°F in Rolla to 86°F in Beulah; Bismarck's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.