Average Soil Temperature in Grass Valley, CA for September 2025
Data from Eagle Lake (98.5 mi away) • 30 of 30 days reported
Monthly Summary by Depth
2" depth
63.3°F
avg
53.8°F – 89.1°F
30 days
4" depth
64.5°F
avg
57.2°F – 73.6°F
30 days
8" depth
66.7°F
avg
61.2°F – 73°F
30 days
20" depth
66.7°F
avg
62.8°F – 74.5°F
30 days
40" depth
64.9°F
avg
62.2°F – 68.2°F
30 days
Daily Readings
| Date | 2" | 4" | 8" | 20" | 40" |
|---|---|---|---|---|---|
| Sep 1 | 89.1°F | 66.2°F | 72.7°F | 73.2°F | 68.2°F |
| Sep 2 | 82.4°F | 73°F | 72.7°F | 74.5°F | 68.2°F |
| Sep 3 | 63.1°F | 68.5°F | 71.4°F | 72.1°F | 67.8°F |
| Sep 4 | 68.2°F | 72.9°F | 72.7°F | 72.1°F | 67.8°F |
| Sep 5 | 69.6°F | 73.6°F | 73°F | 71.6°F | 67.5°F |
| Sep 6 | 63.1°F | 68°F | 71.4°F | 70.5°F | 67.1°F |
| Sep 7 | 64.2°F | 68.7°F | 70.3°F | 70.7°F | 67.1°F |
| Sep 8 | 62.6°F | 67.5°F | 70°F | 70°F | 67.1°F |
| Sep 9 | 60.8°F | 64.9°F | 68.5°F | 68°F | 66.4°F |
| Sep 10 | 61.2°F | 64.2°F | 67.1°F | 67.3°F | 66°F |
| Sep 11 | 57.4°F | 61.2°F | 65.8°F | 66.4°F | 65.8°F |
| Sep 12 | 57.7°F | 61.7°F | 65.8°F | 65.5°F | 65.5°F |
| Sep 13 | 80.4°F | 68°F | 62.2°F | 64.9°F | 65.1°F |
| Sep 14 | 59.4°F | 63.7°F | 67.1°F | 65.7°F | 64.8°F |
| Sep 15 | 76.8°F | 63.3°F | 63.1°F | 65.5°F | 64.4°F |
| Sep 16 | 61.2°F | 64.4°F | 66.4°F | 65.1°F | 64.2°F |
| Sep 17 | 56.7°F | 58.1°F | 63.1°F | 65.3°F | 64.2°F |
| Sep 18 | 64.8°F | 66.6°F | 67.1°F | 65.3°F | 63.9°F |
| Sep 19 | 61.7°F | 63.3°F | 65.1°F | 65.5°F | 63.9°F |
| Sep 20 | 62.2°F | 65.3°F | 66.7°F | 65.3°F | 63.9°F |
| Sep 21 | 60.4°F | 64°F | 65.8°F | 65.1°F | 63.9°F |
| Sep 22 | 56.8°F | 61°F | 65.1°F | 64.4°F | 63.5°F |
| Sep 23 | 55.6°F | 60.1°F | 64.2°F | 63.9°F | 63.5°F |
| Sep 24 | 58.3°F | 61.2°F | 63.5°F | 63.3°F | 63.1°F |
| Sep 25 | 58.8°F | 62.2°F | 63.9°F | 63.3°F | 63°F |
| Sep 26 | 56.3°F | 60.3°F | 64.2°F | 63.1°F | 62.6°F |
| Sep 27 | 58.8°F | 61.2°F | 63.1°F | 62.8°F | 62.6°F |
| Sep 28 | 59.9°F | 62.4°F | 63.5°F | 63.7°F | 62.6°F |
| Sep 29 | 57.7°F | 61.2°F | 63.9°F | 63.1°F | 62.2°F |
| Sep 30 | 53.8°F | 57.2°F | 61.2°F | 63.7°F | 62.2°F |