April weather in Castlewood, SD
The average temperature in Castlewood in April is 41.9°F (29.6°F–54.1°F). Average precipitation: 2.13 inches.
April is a spring month in Castlewood, and is cooler than the annual average of 42.7°F. Daily temperatures swing about 24.5°F between overnight low and afternoon high. Daylight averages about 13h 16m. For travel, April is cool.
Avg High
54.1°F
Avg Low
29.6°F
Precipitation
2.13 in
Daylight
13h 16m
April records in Castlewood
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| April 1 | 78.1°F (2012) | 9.0°F (2014) | 0.24 in (2023) |
| April 2 | 84.0°F (2012) | 10.0°F (2014) | 0.68 in (2025) |
| April 3 | 70.0°F (2021) | 16.0°F (2020) | 0.33 in (2025) |
| April 4 | 71.1°F (2021) | -2.9°F (2018) | 0.21 in (2026) |
| April 5 | 78.1°F (2021) | -4.0°F (2018) | 0.22 in (2025) |
| April 6 | 84.9°F (2021) | 5.0°F (2018) | 0.10 in (2022) |
| April 7 | 64.9°F (2020) | 6.1°F (2018) | 1.76 in (2021) |
| April 8 | 69.1°F (2020) | 8.1°F (2018) | 0.41 in (2021) |
| April 9 | 64.9°F (2019) | 15.1°F (2016) | 0.84 in (2021) |
| April 10 | 80.1°F (2014) | 14.0°F (2013) | 0.13 in (2013) |
| April 11 | 70.0°F (2023) | 15.1°F (2012) | 1.88 in (2019) |
| April 12 | 80.1°F (2023) | 15.1°F (2016) | 0.98 in (2019) |
| April 13 | 78.1°F (2023) | 18.0°F (2020) | 0.60 in (2012) |
| April 14 | 86.0°F (2024) | 17.1°F (2020) | 0.30 in (2013) |
| April 15 | 79.0°F (2016) | 10.9°F (2014) | 0.51 in (2012) |
| April 16 | 77.0°F (2026) | 12.0°F (2020) | 0.80 in (2012) |
| April 17 | 84.9°F (2026) | 12.9°F (2014) | 0.80 in (2024) |
| April 18 | 70.0°F (2015) | 18.0°F (2014) | 0.28 in (2012) |
| April 19 | 69.1°F (2015) | 19.0°F (2022) | 0.85 in (2016) |
| April 20 | 73.0°F (2014) | 6.1°F (2013) | 0.33 in (2017) |
| April 21 | 81.0°F (2019) | 5.0°F (2021) | 0.31 in (2023) |
| April 22 | 69.1°F (2025) | 5.0°F (2021) | 0.19 in (2013) |
| April 23 | 73.9°F (2020) | 10.0°F (2013) | 0.15 in (2013) |
| April 24 | 78.1°F (2016) | 10.9°F (2013) | 0.49 in (2016) |
| April 25 | 82.0°F (2012) | 18.0°F (2013) | 1.35 in (2015) |
| April 26 | 77.0°F (2012) | 19.0°F (2022) | 0.40 in (2024) |
| April 27 | 69.1°F (2013) | 19.0°F (2022) | 0.57 in (2024) |
| April 28 | 75.0°F (2013) | 27.0°F (2022) | 0.93 in (2016) |
| April 29 | 77.0°F (2013) | 28.9°F (2018) | 1.47 in (2024) |
| April 30 | 73.0°F (2013) | 28.9°F (2025) | 1.02 in (2022) |