| Jump to regional table: | Monthly Average Temperature (°F) for Northern Atlantic Coast | ||||||||||||
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Coastal Water Temperature Guide Home Northern Atlantic Coast |
Recent Temperature (°F) |
JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC |
| GULF OF MAINE - 78 NM East of Portsmouth, NH | 43.1 | 40.6 | 39.9 | 41.2 | 46.3 | 54.1 | 63.0 | 65.4 | 61.1 | 54.8 | 50.0 | 46.4 | |
| PORTLAND - 12 NM Southeast of Portland,ME |
45.3 (04/29/2025 18:00 UTC) |
41.5 | 39.0 | 38.8 | 42.0 | 48.6 | 55.9 | 61.5 | 63.6 | 60.5 | 55.1 | 49.9 | 45.1 |
| NANTUCKET 54 NM Southeast of Nantucket | 45.8 | 43.2 | 42.8 | 44.0 | 48.2 | 55.2 | 63.5 | 68.9 | 66.5 | 60.5 | 55.7 | 50.1 | |
| GEORGES BANK 170 NM East of Hyannis, MA |
44.6 (04/29/2025 18:00 UTC) |
45.1 | 42.5 | 40.9 | 42.2 | 46.4 | 53.5 | 62.8 | 66.2 | 63.5 | 59.2 | 53.8 | 49.3 |
| BOSTON 16 NM East of Boston, MA |
47.5 (04/29/2025 18:00 UTC) |
42.0 | 39.2 | 39.3 | 43.0 | 50.7 | 59.3 | 65.0 | 66.6 | 63.7 | 57.4 | 51.5 | 46.5 |
| CAPE COD - 9 NM North of Provincetown, MA | 44.2 | 41.5 | 41.3 | 43.3 | 49.7 | 57.7 | 63.0 | 64.7 | 64.1 | 58.1 | 52.4 | 47.6 | |
| NANTUCKET SOUND |
51.8 (04/29/2025 18:00 UTC) |
38.7 | 36.4 | 39.4 | 46.5 | 54.0 | 63.9 | 73.0 | 74.7 | 70.2 | 61.6 | 52.4 | 43.8 |
| Eastport, ME |
40.5 (04/29/2025 18:24 UTC) |
40.3 | 37.1 | 37.0 | 39.4 | 42.8 | 46.9 | 50.6 | 53.4 | 54.5 | 53.3 | 49.7 | 45.1 |
| Cutler Farris Wharf, ME |
41.7 (04/29/2025 18:24 UTC) |
40.9 | 38.1 | 37.9 | 40.2 | 43.9 | 47.7 | 51.5 | 54.2 | 55.0 | 54.0 | 50.3 | 45.6 |
| Bar Harbor, ME | 36.1 | 33.5 | 35.2 | 40.5 | 46.8 | 52.2 | 56.6 | 58.4 | 57.1 | 54.0 | 48.7 | 42.2 | |
| Portland, ME |
44.2 (04/29/2025 18:24 UTC) |
39.5 | 37.8 | 39.7 | 44.3 | 50.3 | 56.1 | 59.7 | 61.3 | 60.6 | 54.7 | 48.3 | 43.9 |
| Fall River, MA |
55.8 (04/29/2025 18:24 UTC) |
39.0 | 37.9 | 41.4 | 48.5 | 56.9 | 65.7 | 75.1 | 75.6 | 70.0 | 61.4 | 51.5 | 44.3 |
| Chatham, Lydia Cove, MA | 39.8 | 38.5 | 42.0 | 49.1 | 56.5 | 63.3 | 68.7 | 68.8 | 66.1 | 59.7 | 50.4 | 43.9 | |
| Woods Hole, MA |
52.2 (04/29/2025 18:24 UTC) |
36.8 | 34.9 | 38.2 | 45.3 | 54.6 | 63.8 | 71.2 | 72.6 | 69.4 | 61.6 | 51.6 | 42.9 |
| Nantucket Island, MA |
55.2 (04/29/2025 18:24 UTC) |
36.7 | 36.1 | 41.0 | 50.4 | 59.5 | 68.3 | 74.0 | 75.0 | 69.7 | 60.1 | 50.2 | 42.6 |
| Newport, RI |
51.6 (04/29/2025 18:24 UTC) |
39.5 | |||||||||||
