Near Shore Water Temperature Normals
| Beach Temperature Normals ( °F) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| Eastport, ME | 40 | 37 | 38 | 41 | 44 | 46 | 51 | 51 | 52 | 50 | 49 | 45 |
| Bar Harbor, ME | 38 | 36 | 38 | 44 | 49 | 55 | 59 | 62 | 58 | 54 | 52 | 44 |
| Portland, ME | 34 | 33 | 37 | 40 | 49 | 56 | 61 | 62 | 59 | 52 | 47 | 39 |
| Portsmouth Harbor, NH | 40 | 35 | 37 | 43 | 50 | 55 | 60 | 62 | 59 | 52 | 48 | 41 |
| Boston Harbor, MA | 40 | 36 | 41 | 47 | 56 | 62 | 67 | 68 | 65 | 57 | 51 | 42 |
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