Average Soil Temperature in Portland, ME for May 2026
Data from Durham 2 N (47.8 mi away) • 27 of 31 days reported
Monthly Summary by Depth
2" depth
58.7°F
avg
51.1°F – 68.2°F
27 days
4" depth
56.9°F
avg
50.5°F – 63.9°F
27 days
Daily Readings
| Date | 2" | 4" |
|---|---|---|
| May 1 | 54.5°F | 53.1°F |
| May 2 | 52.2°F | 51.6°F |
| May 3 | 51.1°F | 50.5°F |
| May 4 | 53.4°F | 51.8°F |
| May 5 | 57.6°F | 55.4°F |
| May 6 | 58.1°F | 56.5°F |
| May 7 | 58.6°F | 57°F |
| May 8 | 55.9°F | 54.9°F |
| May 9 | 52.3°F | 52°F |
| May 10 | 56.7°F | 54.7°F |
| May 11 | 57.4°F | 56.1°F |
| May 13 | 53.4°F | 52.7°F |
| May 14 | 54°F | 52.9°F |
| May 15 | 53.8°F | 52.7°F |
| May 16 | 58.5°F | 55.9°F |
| May 17 | 62.8°F | 60.3°F |
| May 18 | 63°F | 59.7°F |
| May 19 | 65.1°F | 61°F |
| May 20 | 68.2°F | 63.9°F |
| May 21 | 65.1°F | 63.5°F |
| May 22 | 62.1°F | 60.3°F |
| May 23 | 59.9°F | 58.5°F |
| May 24 | 57.7°F | 56.8°F |
| May 25 | 59.4°F | 57.4°F |
| May 26 | 63.7°F | 60.3°F |
| May 27 | 66°F | 62.8°F |
| May 28 | 64.9°F | 62.8°F |