Boothbay Harbor — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Boothbay Harbor (Maine, United States). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Boothbay Harbor help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Boothbay Harbor in the Atlantic Ocean today is 16°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Water temperature in Boothbay Harbor has risen over the last week and month. Currently, the sea water at this location is slightly warmer than average for this day in previous years.
According to our forecast, Water temperature in Boothbay Harbor will be 14.9°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 27 | 14.0°C | 10.0°C | |
| JUN 28 | 14.3°C | 9.8°C | |
| JUN 29 | 14.4°C | 10.5°C | |
| JUN 30 | 14.8°C | 14.5°C | |
| JUL 1 | 15.2°C | 14.8°C | |
| JUL 2 | 15.6°C | 14.5°C | |
| JUL 3 | 15.7°C | 14.8°C | |
| JUL 4 | 15.8°C | 14.5°C | |
| JUL 5 | 16.3°C | 14.5°C | 16.3°C |
| JUL 6 | 13.3°C | 16.1°C | |
| JUL 7 | 14.0°C | 15.9°C | |
| JUL 8 | 14.5°C | 15.7°C | |
| JUL 9 | 14.5°C | 15.5°C | |
| JUL 10 | 13.8°C | 15.3°C | |
| JUL 11 | 14.3°C | 15.1°C | |
| JUL 12 | 14.0°C | 14.9°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Boothbay Harbor sits on Maine’s mid-coast and is characterized by a rocky coastline, sheltered coves and a busy working harbor. Sea surface temperatures follow the patterns of the Gulf of Maine: winter waters hover near freezing, typically around 0–3 °C, and remain cold into early spring. From late spring through early summer the water warms to roughly 4–12 °C, with the warmest conditions arriving in July and August when open-water temperatures commonly reach 12–20 °C in the harbor and adjacent coves; the warmest, most protected pockets can occasionally approach 20–22 °C on calm late-summer days. As autumn progresses the surface cools again to about 8–15 °C by September and October, before dropping back toward near-freezing in late fall and winter.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 5°C | 9°C |
| February | 1°C | 4°C | 6°C |
| March | 1°C | 4°C | 6°C |
| April | 2°C | 5°C | 7°C |
| May | 4°C | 8°C | 12°C |
| June | 8°C | 12°C | 15°C |
| July | 12°C | 15°C | 18°C |
| August | 13°C | 17°C | 20°C |
| September | 12°C | 15°C | 18°C |
| October | 8°C | 13°C | 16°C |
| November | 7°C | 10°C | 14°C |
| December | 3°C | 8°C | 11°C |
* Click on a month to view detailed water temperature data.
Boothbay Harbor: Weather Forecast
July 6
July 7
July 8
July 9
Location, Beaches & Local Information
Nearby Beaches & Facilities
Spectacle Island Preserve
Hendricks Head Preserve
Sand Cove Beach
Pemaquid Beach
Reid State Park Beach
Swimming Conditions
Swimming and beach recreation in and around Boothbay Harbor reflect those temperature realities and the varied shoreline. Summer offers the best window for comfortable swims, though even then many visitors find the water brisk enough to prefer short dips, swims close to shore or wetsuits for longer outings. Sandy beaches and sheltered inlets in the region provide family-friendly spots for paddling and shallow play, while rocky points and deeper harbor areas attract experienced swimmers, open-water swimmers and those combining swimming with kayaking or paddleboarding. Tidal currents, boat traffic and rapidly changing weather are common considerations, so swimmers should choose protected locations, check local conditions and amenities, and plan accordingly for a seaside holiday that balances scenic exploration with the cool, clear waters of Maine.