August weather in Castlewood, SD
The average temperature in Castlewood in August is 68.3°F (56.1°F–80.5°F). Average precipitation: 3.08 inches.
August is a summer month in Castlewood, and is warmer than the annual average of 42.7°F. Daily temperatures swing about 24.4°F between overnight low and afternoon high. Daylight averages about 13h 52m. For travel, August is a comfortable month to visit.
Avg High
80.5°F
Avg Low
56.1°F
Precipitation
3.08 in
Daylight
13h 52m
August records in Castlewood
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 91.9°F (2012) | 48.9°F (2021) | 0.62 in (2024) |
| August 2 | 99.0°F (2012) | 42.1°F (2018) | 0.23 in (2012) |
| August 3 | 98.1°F (2022) | 42.1°F (2018) | 0.64 in (2025) |
| August 4 | 91.9°F (2014) | 45.0°F (2017) | 0.90 in (2012) |
| August 5 | 86.0°F (2014) | 45.0°F (2017) | 0.29 in (2023) |
| August 6 | 93.0°F (2022) | 51.1°F (2024) | 2.02 in (2023) |
| August 7 | 89.1°F (2012) | 51.1°F (2013) | 2.36 in (2015) |
| August 8 | 91.0°F (2012) | 45.0°F (2022) | 0.59 in (2021) |
| August 9 | 89.1°F (2018) | 46.0°F (2024) | 0.93 in (2020) |
| August 10 | 91.0°F (2016) | 41.0°F (2024) | 1.90 in (2014) |
| August 11 | 91.9°F (2016) | 46.9°F (2012) | 1.13 in (2023) |
| August 12 | 89.1°F (2016) | 46.9°F (2012) | 2.15 in (2016) |
| August 13 | 91.0°F (2022) | 45.0°F (2012) | 0.84 in (2016) |
| August 14 | 88.0°F (2018) | 44.1°F (2021) | 1.90 in (2023) |
| August 15 | 91.0°F (2015) | 48.9°F (2013) | 1.04 in (2024) |
| August 16 | 90.0°F (2015) | 44.1°F (2016) | 0.95 in (2025) |
| August 17 | 87.1°F (2021) | 37.9°F (2012) | 0.88 in (2017) |
| August 18 | 91.0°F (2021) | 48.9°F (2012) | 1.43 in (2025) |
| August 19 | 89.1°F (2021) | 48.9°F (2012) | 2.50 in (2016) |
| August 20 | 93.0°F (2023) | 42.1°F (2012) | 1.64 in (2018) |
| August 21 | 87.1°F (2015) | 46.0°F (2016) | 0.57 in (2014) |
| August 22 | 91.0°F (2013) | 46.0°F (2018) | 0.70 in (2017) |
| August 23 | 96.1°F (2023) | 44.1°F (2017) | 0.31 in (2025) |
| August 24 | 91.0°F (2013) | 43.0°F (2017) | 0.90 in (2014) |
| August 25 | 91.9°F (2013) | 42.1°F (2015) | 0.02 in (2019) |
| August 26 | 93.0°F (2013) | 41.0°F (2025) | 1.59 in (2017) |
| August 27 | 91.9°F (2013) | 46.9°F (2022) | 1.10 in (2024) |
| August 28 | 91.9°F (2013) | 48.0°F (2017) | 1.17 in (2020) |
| August 29 | 93.0°F (2012) | 43.0°F (2018) | 0.44 in (2014) |
| August 30 | 97.0°F (2012) | 43.0°F (2019) | 0.12 in (2024) |
| August 31 | 88.0°F (2013) | 43.0°F (2019) | 0.94 in (2020) |