Average Soil Temperature in Spearfish, SD for August 2026
Data from Sundance 8 NNW (28.4 mi away) • 25 of 31 days reported
Monthly Summary by Depth
2" depth
64.7°F
avg
62.1°F – 68.7°F
25 days
4" depth
63.8°F
avg
60.8°F – 67.5°F
25 days
8" depth
62.6°F
avg
61.3°F – 64.9°F
25 days
20" depth
59.7°F
avg
58.8°F – 61.2°F
25 days
40" depth
58.5°F
avg
58.1°F – 59°F
25 days
Daily Readings
| Date | 2" | 4" | 8" | 20" | 40" |
|---|---|---|---|---|---|
| Aug 1 | 67.5°F | 66°F | 64°F | 61°F | 58.8°F |
| Aug 2 | 68.7°F | 67.5°F | 64.9°F | 61.2°F | 58.8°F |
| Aug 3 | 65.8°F | 64.9°F | 64.2°F | 61.2°F | 59°F |
| Aug 4 | 62.1°F | 60.8°F | 61.9°F | 60.8°F | 59°F |
| Aug 5 | 63.3°F | 61.9°F | 61.5°F | 60.1°F | 58.8°F |
| Aug 6 | 64.4°F | 63.1°F | 61.9°F | 59.9°F | 58.6°F |
| Aug 7 | 64.8°F | 63.1°F | 62.2°F | 59.7°F | 58.6°F |
| Aug 8 | 66.2°F | 64.8°F | 62.8°F | 59.9°F | 58.5°F |
| Aug 9 | 66.2°F | 64.9°F | 63°F | 60.1°F | 58.5°F |
| Aug 10 | 66.9°F | 66°F | 63.5°F | 60.3°F | 58.5°F |
| Aug 11 | 66.9°F | 66.2°F | 63.9°F | 60.4°F | 58.6°F |
| Aug 13 | 63.5°F | 62.4°F | 61.9°F | 59.4°F | 58.6°F |
| Aug 14 | 63.7°F | 62.8°F | 62.1°F | 59.2°F | 58.6°F |
| Aug 15 | 62.4°F | 61.7°F | 61.7°F | 59°F | 58.6°F |
| Aug 16 | 62.4°F | 61.9°F | 61.3°F | 58.8°F | 58.6°F |
| Aug 17 | 63°F | 62.6°F | 61.5°F | 58.8°F | 58.5°F |
| Aug 18 | 62.8°F | 62.4°F | 61.7°F | 58.8°F | 58.3°F |
| Aug 19 | 63°F | 62.4°F | 61.3°F | 58.8°F | 58.1°F |
| Aug 20 | 64.2°F | 63.7°F | 61.9°F | 58.8°F | 58.1°F |
| Aug 21 | 66°F | 64.9°F | 63°F | 58.8°F | 58.1°F |
| Aug 22 | 64.9°F | 64.4°F | 63°F | 59.2°F | 58.1°F |
| Aug 23 | 65.7°F | 65.1°F | 63.3°F | 59.4°F | 58.5°F |
| Aug 24 | 65.3°F | 64.6°F | 63.1°F | 59.7°F | 58.5°F |
| Aug 25 | 64.2°F | 63.3°F | 62.8°F | 59.5°F | 58.6°F |
| Aug 26 | 63.5°F | 62.8°F | 62.1°F | 59.4°F | 58.6°F |