Average Soil Temperature in Decatur, IL for August 2026
Data from Champaign 9 SW (33.8 mi away) • 25 of 31 days reported
Monthly Summary by Depth
2" depth
77.4°F
avg
73°F – 81.5°F
25 days
4" depth
76.7°F
avg
73.6°F – 79.9°F
25 days
8" depth
75.7°F
avg
73.6°F – 77.7°F
25 days
20" depth
73.7°F
avg
72.5°F – 74.5°F
25 days
40" depth
71.8°F
avg
71.1°F – 72.5°F
25 days
Daily Readings
| Date | 2" | 4" | 8" | 20" | 40" |
|---|---|---|---|---|---|
| Aug 1 | 75°F | 74.8°F | 74.8°F | 73.2°F | 71.6°F |
| Aug 2 | 74.8°F | 74.3°F | 74.5°F | 72.9°F | 71.4°F |
| Aug 3 | 77°F | 75.4°F | 74.7°F | 72.5°F | 71.1°F |
| Aug 4 | 79.2°F | 77.5°F | 76.3°F | 72.7°F | 71.1°F |
| Aug 5 | 78.6°F | 77.7°F | 76.8°F | 73.4°F | 71.2°F |
| Aug 6 | 76.8°F | 76.6°F | 76.3°F | 73.4°F | 71.4°F |
| Aug 7 | 79.5°F | 77.5°F | 75.6°F | 73.4°F | 71.4°F |
| Aug 8 | 80.8°F | 79°F | 76.8°F | 73.6°F | 71.4°F |
| Aug 9 | 81.1°F | 79.2°F | 77.2°F | 73.9°F | 71.6°F |
| Aug 10 | 81.5°F | 79.9°F | 77.7°F | 74.3°F | 71.8°F |
| Aug 11 | 79.3°F | 78.8°F | 77.5°F | 74.5°F | 72.1°F |
| Aug 12 | 75.7°F | 76.1°F | 75.9°F | 74.3°F | 72.1°F |
| Aug 13 | 77°F | 76.3°F | 75.4°F | 73.9°F | 72.1°F |
| Aug 14 | 75.7°F | 75.2°F | 74.5°F | 73.9°F | 72.5°F |
| Aug 15 | 78.3°F | 76.8°F | 75.2°F | 73.6°F | 72°F |
| Aug 16 | 79.5°F | 78.4°F | 76.5°F | 73.9°F | 71.8°F |
| Aug 17 | 78.1°F | 77.9°F | 76.6°F | 74.3°F | 72.1°F |
| Aug 18 | 76.3°F | 76.3°F | 75.6°F | 74.3°F | 72.1°F |
| Aug 19 | 77.9°F | 77.2°F | 75.7°F | 73.9°F | 72.1°F |
| Aug 20 | 77.7°F | 76.8°F | 75.6°F | 74.1°F | 72°F |
| Aug 21 | 76.8°F | 76.5°F | 75.4°F | 73.9°F | 71.6°F |
| Aug 22 | 76.3°F | 76.5°F | 75.7°F | 73.9°F | 72°F |
| Aug 23 | 73.9°F | 74.7°F | 74.7°F | 73.8°F | 72.1°F |
| Aug 24 | 73°F | 73.6°F | 73.8°F | 73.2°F | 72°F |
| Aug 25 | 74.3°F | 73.9°F | 73.6°F | 72.9°F | 71.8°F |