Average Soil Temperature in Rialto, CA for September 2026
Data from Fallbrook 5 NE (47.7 mi away) • 25 of 30 days reported
Monthly Summary by Depth
2" depth
85.5°F
avg
79.5°F – 92.5°F
25 days
4" depth
85.6°F
avg
81.7°F – 92.1°F
25 days
Daily Readings
| Date | 2" | 4" |
|---|---|---|
| Sep 1 | 88.2°F | 88.5°F |
| Sep 2 | 86.4°F | 86.7°F |
| Sep 3 | 84.4°F | 84.7°F |
| Sep 4 | 84.9°F | 84.9°F |
| Sep 5 | 86.4°F | 85.6°F |
| Sep 6 | 79.5°F | 81.9°F |
| Sep 7 | 82°F | 82.4°F |
| Sep 8 | 90.1°F | 88.7°F |
| Sep 9 | 92.5°F | 91.9°F |
| Sep 10 | 92.5°F | 92.1°F |
| Sep 11 | 91°F | 90.9°F |
| Sep 12 | 88.7°F | 88.9°F |
| Sep 13 | 87.3°F | 87.6°F |
| Sep 14 | 86.2°F | 86.4°F |
| Sep 15 | 84.7°F | 85.3°F |
| Sep 16 | 84.2°F | 84.4°F |
| Sep 17 | 84.2°F | 84.6°F |
| Sep 18 | 82.8°F | 82.9°F |
| Sep 19 | 83.5°F | 83.5°F |
| Sep 20 | 83.1°F | 83.3°F |
| Sep 21 | 82.6°F | 82.9°F |
| Sep 22 | 84.4°F | 84.2°F |
| Sep 23 | 82.8°F | 82.8°F |
| Sep 24 | 81.9°F | 81.7°F |
| Sep 25 | 83.8°F | 83.1°F |