Casper weather in August: Casper, Wyoming: normal highs, lows, rain and records for August
Casper in August has a normal high of 87°F and a normal low of 51°F, a daily mean of 69°F, falling from 90°F on the 1st to 83°F by the 31st. Measurable precipitation falls on 6 days in a normal August, 0.79 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 11°C, 20 mm of precipitation in August.
- NOAA stationCasper-Natrona County Airport
- Station IDUSW00024089
- Location42.90°N 106.46°W
- Elevation5,338 ft (1,627 m)
- Population58,823
- Jan 35° 15°
- Feb 38° 15°
- Mar 49° 23°
- Apr 56° 28°
- May 67° 37°
- Jun 80° 45°
- Jul 89° 53°
- Aug 87° 51°
- Sep 76° 42°
- Oct 60° 31°
- Nov 46° 22°
- Dec 35° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Casper in August?
The normal high is 87°F and the normal low 51°F, for a daily mean of 69.0°F. August is 2.0°F cooler than July and 10.1°F warmer than September. August is the 2nd warmest month of the year in Casper and the 8th wettest. Across the month the normal high falls 7°F, from 90°F on August 1 to 83°F on August 31. From one year to the next August's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 71°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 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 90°F | 55°F | 21% | 8% |
| August 8 | 89°F | 54°F | 20% | 8% |
| August 15 | 87°F | 52°F | 19% | 8% |
| August 22 | 85°F | 50°F | 19% | 7% |
| August 31 | 83°F | 47°F | 19% | 8% |
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 | 90°F | 55°F | 21% | 8% | 14 h 30 min |
| August 2 | 90°F | 54°F | 21% | 8% | 14 h 30 min |
| August 3 | 90°F | 54°F | 21% | 8% | 14 h 30 min |
| August 4 | 89°F | 54°F | 21% | 8% | 14 h 30 min |
| August 5 | 89°F | 54°F | 21% | 8% | 14 h 20 min |
| August 6 | 89°F | 54°F | 21% | 8% | 14 h 20 min |
| August 7 | 89°F | 54°F | 21% | 8% | 14 h 20 min |
| August 8 | 89°F | 54°F | 20% | 8% | 14 h 20 min |
| August 9 | 89°F | 53°F | 20% | 8% | 14 h 10 min |
| August 10 | 88°F | 53°F | 20% | 8% | 14 h 10 min |
| August 11 | 88°F | 53°F | 20% | 8% | 14 h 10 min |
| August 12 | 88°F | 53°F | 20% | 8% | 14 h 10 min |
| August 13 | 88°F | 52°F | 20% | 8% | 14 h |
| August 14 | 87°F | 52°F | 20% | 8% | 14 h |
| August 15 | 87°F | 52°F | 19% | 8% | 14 h |
| August 16 | 87°F | 52°F | 19% | 8% | 14 h |
| August 17 | 87°F | 51°F | 19% | 8% | 13 h 50 min |
| August 18 | 87°F | 51°F | 19% | 8% | 13 h 50 min |
| August 19 | 86°F | 51°F | 19% | 7% | 13 h 50 min |
| August 20 | 86°F | 51°F | 19% | 7% | 13 h 50 min |
| August 21 | 86°F | 50°F | 19% | 7% | 13 h 40 min |
| August 22 | 85°F | 50°F | 19% | 7% | 13 h 40 min |
| August 23 | 85°F | 50°F | 19% | 7% | 13 h 40 min |
| August 24 | 85°F | 50°F | 19% | 7% | 13 h 40 min |
| August 25 | 85°F | 49°F | 19% | 7% | 13 h 30 min |
| August 26 | 84°F | 49°F | 19% | 7% | 13 h 30 min |
| August 27 | 84°F | 49°F | 19% | 7% | 13 h 30 min |
| August 28 | 84°F | 48°F | 19% | 7% | 13 h 20 min |
| August 29 | 83°F | 48°F | 19% | 8% | 13 h 20 min |
| August 30 | 83°F | 48°F | 19% | 8% | 13 h 20 min |
| August 31 | 83°F | 47°F | 19% | 8% | 13 h 20 min |
- Normal high
- 87°FAugust average
- Normal low
- 51°FAugust average
- Precipitation
- 0.79 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 13
- Daylight
- 14 h 30 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 27
- Sunshine
- 86%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024089; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Casper in August?
On a given August day the chance of 0.01 inch or more is 20% on average, highest around August 1 (21%). In all, 0.79 in falls on 6 days of a normal August.
In a normal August in Casper, 13 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024089.
How humid and windy is Casper in August?
At 3 p.m. the normal temperature is 82°F with 19% relative humidity and a dew point of 35°F; at 6 a.m. it is 54°F with 61% humidity. The wind averages 9.5 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 54°F | 41°F | 61% | 7.5 mph | 81% |
| 9 a.m. | 69°F | 42°F | 37% | 11.6 mph | 82% |
| noon | 79°F | 38°F | 23% | 11.2 mph | 84% |
| 3 p.m. | 82°F | 35°F | 19% | 12.5 mph | 81% |
| 6 p.m. | 75°F | 37°F | 25% | 10.6 mph | 79% |
| 9 p.m. | 63°F | 40°F | 42% | 8.3 mph | 81% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024089. 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 Casper?
The warmest August temperature on Casper's official record (since 1939) is 103°F, on August 2, 2026; the coldest is 29°F, on August 23, 2015. The wettest August brought 2.79 in (1941).
The August mean against the 1991-2020 normal of 69.0°F: 2021 68.2°F (−0.8), 2022 70.6°F (+1.6), 2023 68.2°F (−0.8), 2024 70.0°F (+1.0), 2025 69.2°F (+0.2), 2026 71.5°F (+2.5). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.2°F | −0.8°F | 0.94 in |
| 2022 | 70.6°F | +1.6°F | 1.99 in |
| 2023 | 68.2°F | −0.8°F | 1.01 in |
| 2024 | 70.0°F | +1.0°F | 0.39 in |
| 2025 | 69.2°F | +0.2°F | 0.72 in |
| 2026 | 71.5°F | +2.5°F | 2.01 in |
Source: records: ACIS, NWS threaded record CPRthr; recent months: ACIS, station USW00024089. Records and recent months use complete months only.
How does August in Casper compare across Wyoming?
Across the 71 places PlainClimate covers in Wyoming, August normal highs run from 74°F in Sundance to 91°F in Basin; Casper's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.