Average Soil Temperature in Harlan, IA for September 2026
Data from Shagbark Hills (59.4 mi away) • 24 of 30 days reported
Monthly Summary by Depth
2" depth
70°F
avg
63.7°F – 76.8°F
24 days
4" depth
70.8°F
avg
64°F – 78.3°F
24 days
8" depth
71.5°F
avg
65.5°F – 77.4°F
24 days
20" depth
70°F
avg
65.3°F – 73.9°F
24 days
40" depth
68.2°F
avg
66°F – 69.4°F
24 days
Daily Readings
| Date | 2" | 4" | 8" | 20" | 40" |
|---|---|---|---|---|---|
| Sep 1 | 75.9°F | 77.4°F | 76.3°F | 72.7°F | 68.5°F |
| Sep 2 | 76.5°F | 77.9°F | 76.8°F | 73°F | 68.7°F |
| Sep 3 | 76.8°F | 78.3°F | 77.4°F | 73.4°F | 68.9°F |
| Sep 6 | 74.3°F | 75.2°F | 76.5°F | 73.9°F | 69.3°F |
| Sep 7 | 75°F | 75.9°F | 76.1°F | 73.2°F | 69.4°F |
| Sep 8 | 73.2°F | 74.1°F | 75°F | 73°F | 69.4°F |
| Sep 9 | 73.9°F | 75.2°F | 75.7°F | 72.7°F | 69.4°F |
| Sep 10 | 72.7°F | 73.6°F | 74.7°F | 72.3°F | 69.3°F |
| Sep 11 | 72.1°F | 72.7°F | 73.6°F | 71.8°F | 69.3°F |
| Sep 12 | 71.1°F | 72.1°F | 73.2°F | 71.4°F | 69.1°F |
| Sep 13 | 68°F | 68.5°F | 70.3°F | 70.7°F | 68.9°F |
| Sep 14 | 67.6°F | 68°F | 68.9°F | 69.4°F | 68.7°F |
| Sep 15 | 67.8°F | 68.5°F | 69.6°F | 68.9°F | 68.4°F |
| Sep 16 | 67.8°F | 68.4°F | 69.1°F | 68.5°F | 68°F |
| Sep 17 | 69.4°F | 70.2°F | 70.5°F | 68.4°F | 67.8°F |
| Sep 18 | 71.6°F | 72.5°F | 72°F | 68.7°F | 67.5°F |
| Sep 19 | 70°F | 70.7°F | 71.6°F | 69.3°F | 67.5°F |
| Sep 20 | 67.5°F | 68.2°F | 69.6°F | 69.1°F | 67.5°F |
| Sep 21 | 65.7°F | 66.4°F | 68.2°F | 68.4°F | 67.5°F |
| Sep 22 | 64.8°F | 65.3°F | 67.1°F | 67.5°F | 67.3°F |
| Sep 23 | 65.5°F | 66°F | 67.1°F | 66.7°F | 66.9°F |
| Sep 24 | 64°F | 64.6°F | 66°F | 66.4°F | 66.7°F |
| Sep 25 | 63.7°F | 64°F | 65.5°F | 65.7°F | 66.4°F |
| Sep 26 | 64.8°F | 65.3°F | 66°F | 65.3°F | 66°F |