Average Soil Temperature in Duarte, CA — January 2026
Data from Fallbrook 5 NE (66.2 mi away) • 31 of 31 days reported
Monthly Summary by Depth
2" depth
59.4°F
avg
51.3°F – 65.5°F
31 days
4" depth
59.9°F
avg
54°F – 64.8°F
31 days
Daily Readings
| Date | 2" | 4" |
|---|---|---|
| Jan 1 | 58.1°F | 58.6°F |
| Jan 2 | 59.4°F | 59.5°F |
| Jan 3 | 60.3°F | 60.6°F |
| Jan 4 | 58.6°F | 59.9°F |
| Jan 5 | 57.7°F | 59°F |
| Jan 6 | 55.2°F | 57°F |
| Jan 7 | 55.4°F | 56.8°F |
| Jan 8 | 55.8°F | 57°F |
| Jan 9 | 51.3°F | 54°F |
| Jan 10 | 53.6°F | 54.9°F |
| Jan 11 | 56.1°F | 56.5°F |
| Jan 12 | 57.7°F | 57.9°F |
| Jan 13 | 59.9°F | 59.5°F |
| Jan 14 | 61.5°F | 61°F |
| Jan 15 | 63°F | 62.4°F |
| Jan 16 | 62.4°F | 62.4°F |
| Jan 17 | 62.4°F | 62.6°F |
| Jan 18 | 62.2°F | 62.6°F |
| Jan 19 | 61.9°F | 62.2°F |
| Jan 20 | 62.8°F | 62.8°F |
| Jan 21 | 60.1°F | 61.3°F |
| Jan 22 | 60.1°F | 60.8°F |
| Jan 23 | 60.8°F | 61.2°F |
| Jan 24 | 59.7°F | 61°F |
| Jan 25 | 57.9°F | 59.2°F |
| Jan 26 | 59°F | 59.7°F |
| Jan 27 | 59°F | 59.5°F |
| Jan 28 | 58.5°F | 59.5°F |
| Jan 29 | 61.7°F | 61.2°F |
| Jan 30 | 63.7°F | 63°F |
| Jan 31 | 65.5°F | 64.8°F |