Average Soil Temperature in Fullerton, CA for May 2026
Data from Fallbrook 5 NE (51 mi away) • 31 of 31 days reported
Monthly Summary by Depth
2" depth
76.7°F
avg
67.8°F – 82°F
31 days
4" depth
75.7°F
avg
72.5°F – 79.5°F
5 days
Daily Readings
| Date | 2" | 4" |
|---|---|---|
| May 1 | 75.4°F | 73.8°F |
| May 2 | 76.8°F | 75.2°F |
| May 3 | 71.1°F | 72.5°F |
| May 4 | 69.1°F | — |
| May 5 | 67.8°F | — |
| May 6 | 72°F | — |
| May 7 | 75.7°F | — |
| May 8 | 78.3°F | — |
| May 9 | 79.3°F | — |
| May 10 | 80.1°F | — |
| May 11 | 81.1°F | — |
| May 12 | 73°F | — |
| May 13 | 76.6°F | — |
| May 14 | 77°F | — |
| May 15 | 75.4°F | — |
| May 16 | 77°F | — |
| May 17 | 72°F | — |
| May 18 | 76.8°F | — |
| May 19 | 79.7°F | — |
| May 20 | 82°F | — |
| May 21 | 81.3°F | — |
| May 22 | 81.1°F | — |
| May 23 | 81.3°F | — |
| May 24 | 79.2°F | — |
| May 25 | 78.3°F | — |
| May 26 | 75.2°F | — |
| May 27 | 73.6°F | — |
| May 28 | 76.1°F | — |
| May 29 | 75.6°F | — |
| May 30 | 79.3°F | 77.7°F |
| May 31 | 81.5°F | 79.5°F |