Eastham — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Eastham (Massachusetts, 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 Eastham help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Eastham in the Atlantic Ocean today is 20°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming.
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 Eastham has risen over the last week and month. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Eastham will be 15.6°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 22 | 18.2°C | 17.8°C | |
| JUN 23 | 17.6°C | 18.5°C | |
| JUN 24 | 18.5°C | 18.5°C | |
| JUN 25 | 18.2°C | 18.5°C | |
| JUN 26 | 18.0°C | 19.3°C | |
| JUN 27 | 18.6°C | 19.5°C | |
| JUN 28 | 19.0°C | 19.0°C | |
| JUN 29 | 18.9°C | 19.0°C | |
| JUN 30 | 19.8°C | 19.0°C | 19.8°C |
| JUL 1 | 20.8°C | 19.2°C | |
| JUL 2 | 20.5°C | 18.6°C | |
| JUL 3 | 20.0°C | 18.0°C | |
| JUL 4 | 20.8°C | 17.4°C | |
| JUL 5 | 18.5°C | 16.8°C | |
| JUL 6 | 13.3°C | 16.2°C | |
| JUL 7 | 12.8°C | 15.6°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
Eastham, Massachusetts, sits on the outer Cape Cod peninsula between Cape Cod Bay and the open Atlantic and is known for long sandy beaches, dunes and part of the Cape Cod National Seashore. Water temperatures vary significantly through the year. On the Atlantic-facing side temperatures are cold in winter, typically around 0–4 °C from December through February, rising slowly in spring to roughly 5–12 °C in March–May. Peak summer surface temperatures usually occur in July and August, commonly ranging from about 16–22 °C, with late summer occasionally reaching the upper end of that band. In autumn the surf cools again to roughly 10–16 °C. Bayside waters tend to be a degree or two warmer in comparable months and can feel noticeably milder for wading and sheltered swimming.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 3°C | 5°C | 7°C |
| February | 2°C | 3°C | 6°C |
| March | 2°C | 4°C | 6°C |
| April | 4°C | 7°C | 10°C |
| May | 6°C | 11°C | 15°C |
| June | 10°C | 16°C | 21°C |
| July | 15°C | 20°C | 22°C |
| August | 18°C | 21°C | 24°C |
| September | 16°C | 19°C | 23°C |
| October | 9°C | 16°C | 20°C |
| November | 7°C | 11°C | 15°C |
| December | 4°C | 8°C | 10°C |
* Click on a month to view detailed water temperature data.
Eastham: Weather Forecast
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July 5
Location, Beaches & Local Information
Nearby Beaches & Facilities
Thumpertown
Kingsbury Beach
Cole Road
Herring Brook Beach
Kingsbury
Wiley Park Beach
Wiley Park
Cooks Brook Beach
Bayberry Lane Beach
Swimming Conditions
Swimming and beach holidays in Eastham reflect those seasonal conditions. The most comfortable months for open-water swimming are July and August when the ocean is warmest, but even then many visitors find the water brisk and some prefer a short wetsuit or gradual acclimation. Atlantic beaches such as the Coast Guard and Nauset areas offer strong surf, good conditions for bodyboarding and surfing, and carry a higher risk of rip currents, while bay-side spots are calmer and better suited for families and wading. Lifeguards and visitor facilities are typically seasonal, and tides and wind can change conditions quickly, so swimmers are advised to heed posted advisories. The combination of long beaches, dunes and Cape scenery makes Eastham attractive for beach-focused holidays, though realistic expectations about cool water temperatures outside midsummer are important.