Custer weather in August: Custer, South Dakota: normal highs, lows, rain and records for August
Custer in August has a normal high of 78°F and a normal low of 52°F, a daily mean of 65°F, falling from 79°F on the 1st to 76°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 2.12 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 11°C, 54 mm of precipitation in August.
- NOAA stationCuster County Airport
- Station IDUSW00094032
- Location43.73°N 103.61°W
- Elevation5,545 ft (1,690 m)
- Population1,829
- Jan 35° 15°
- Feb 35° 15°
- Mar 44° 22°
- Apr 50° 29°
- May 60° 38°
- Jun 71° 47°
- Jul 79° 54°
- Aug 78° 52°
- Sep 69° 43°
- Oct 54° 32°
- Nov 43° 22°
- Dec 35° 16°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Custer in August?
The normal high is 78°F and the normal low 52°F, for a daily mean of 64.7°F. August is 1.8°F cooler than July and 8.8°F warmer than September. August is the 2nd warmest month of the year in Custer and the 5th wettest. Across the month the normal high falls 3°F, from 79°F on August 1 to 76°F on August 31. From one year to the next August's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 63°F and 67°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 38%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 79°F | 54°F | 38% | 20% |
| August 8 | 79°F | 53°F | 36% | 19% |
| August 15 | 78°F | 52°F | 33% | 16% |
| August 22 | 77°F | 50°F | 30% | 14% |
| August 31 | 76°F | 48°F | 27% | 13% |
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 | 79°F | 54°F | 38% | 20% | 14 h 40 min |
| August 2 | 79°F | 54°F | 38% | 20% | 14 h 30 min |
| August 3 | 79°F | 54°F | 38% | 20% | 14 h 30 min |
| August 4 | 79°F | 54°F | 38% | 19% | 14 h 30 min |
| August 5 | 79°F | 54°F | 37% | 19% | 14 h 30 min |
| August 6 | 79°F | 54°F | 37% | 19% | 14 h 30 min |
| August 7 | 79°F | 54°F | 37% | 19% | 14 h 20 min |
| August 8 | 79°F | 53°F | 36% | 19% | 14 h 20 min |
| August 9 | 79°F | 53°F | 36% | 18% | 14 h 20 min |
| August 10 | 79°F | 53°F | 36% | 18% | 14 h 20 min |
| August 11 | 79°F | 53°F | 35% | 18% | 14 h 10 min |
| August 12 | 78°F | 53°F | 35% | 17% | 14 h 10 min |
| August 13 | 78°F | 52°F | 34% | 17% | 14 h 10 min |
| August 14 | 78°F | 52°F | 34% | 17% | 14 h 10 min |
| August 15 | 78°F | 52°F | 33% | 16% | 14 h |
| August 16 | 78°F | 52°F | 32% | 16% | 14 h |
| August 17 | 78°F | 52°F | 32% | 16% | 14 h |
| August 18 | 78°F | 51°F | 31% | 16% | 13 h 50 min |
| August 19 | 78°F | 51°F | 31% | 15% | 13 h 50 min |
| August 20 | 78°F | 51°F | 30% | 15% | 13 h 50 min |
| August 21 | 77°F | 51°F | 30% | 15% | 13 h 50 min |
| August 22 | 77°F | 50°F | 30% | 14% | 13 h 40 min |
| August 23 | 77°F | 50°F | 29% | 14% | 13 h 40 min |
| August 24 | 77°F | 50°F | 29% | 14% | 13 h 40 min |
| August 25 | 77°F | 50°F | 29% | 14% | 13 h 40 min |
| August 26 | 77°F | 49°F | 28% | 14% | 13 h 30 min |
| August 27 | 76°F | 49°F | 28% | 13% | 13 h 30 min |
| August 28 | 76°F | 49°F | 28% | 13% | 13 h 30 min |
| August 29 | 76°F | 49°F | 28% | 13% | 13 h 20 min |
| August 30 | 76°F | 48°F | 27% | 13% | 13 h 20 min |
| August 31 | 76°F | 48°F | 27% | 13% | 13 h 20 min |
- Normal high
- 78°FAugust average
- Normal low
- 52°FAugust average
- Precipitation
- 2.12 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 14 h 40 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 27
- Days at 80°F or more
- 14
- Sunshine
- 86%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094032; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Custer in August?
On a given August day the chance of 0.01 inch or more is 33% on average, highest around August 1 (38%). In all, 2.12 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Custer, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094032.
How humid and windy is Custer in August?
At 3 p.m. the normal temperature is 73°F with 32% relative humidity and a dew point of 41°F; at 6 a.m. it is 53°F with 65% humidity. The wind averages 5.9 mph, most often from the south in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 53°F | 42°F | 65% | 4.0 mph | – |
| 9 a.m. | 68°F | 43°F | 41% | 6.8 mph | – |
| noon | 73°F | 42°F | 33% | 8.8 mph | – |
| 3 p.m. | 73°F | 41°F | 32% | 8.7 mph | – |
| 6 p.m. | 68°F | 43°F | 40% | 6.2 mph | – |
| 9 p.m. | 58°F | 43°F | 56% | 4.4 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094032. 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 Custer?
The warmest August temperature on this station's record (since 1999) is 95°F, on August 13, 2007; the coldest is 31°F, on August 31, 2020. The wettest August brought 5.95 in (2007).
The August mean against the 1991-2020 normal of 64.7°F: 2021 66.0°F (+1.3), 2022 67.5°F (+2.8), 2023 65.8°F (+1.1), 2024 67.5°F (+2.8), 2025 64.7°F (at normal), 2026 66.7°F (+2.0). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.0°F | +1.3°F | 0.77 in |
| 2022 | 67.5°F | +2.8°F | 2.90 in |
| 2023 | 65.8°F | +1.1°F | 2.30 in |
| 2024 | 67.5°F | +2.8°F | 1.20 in |
| 2025 | 64.7°F | at normal | 1.83 in |
| 2026 | 66.7°F | +2.0°F | 2.90 in |
Source: records: ACIS, station USW00094032; recent months: ACIS, station USW00094032. Records and recent months use complete months only.
How does August in Custer compare across South Dakota?
Across the 100 places PlainClimate covers in South Dakota, August normal highs run from 78°F in Astoria to 91°F in Interior; Custer's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.