Jamestown — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Jamestown (Rhode Island, 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 Jamestown help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Jamestown in the Atlantic Ocean today is 17°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 Jamestown 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 Jamestown will be 17.5°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 5 | 14.5°C | 15.5°C | |
| JUN 6 | 15.0°C | 16.0°C | |
| JUN 7 | 15.7°C | 16.5°C | |
| JUN 8 | 15.9°C | 15.8°C | |
| JUN 9 | 16.1°C | 16.8°C | |
| JUN 10 | 16.0°C | 16.8°C | |
| JUN 11 | 16.7°C | 17.3°C | |
| JUN 12 | 16.8°C | 17.3°C | |
| JUN 13 | 16.8°C | 17.3°C | 16.8°C |
| JUN 14 | 16.5°C | 16.9°C | |
| JUN 15 | 16.5°C | 17.0°C | |
| JUN 16 | 17.3°C | 17.1°C | |
| JUN 17 | 16.8°C | 17.2°C | |
| JUN 18 | 17.3°C | 17.3°C | |
| JUN 19 | 17.8°C | 17.4°C | |
| JUN 20 | 18.0°C | 17.5°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
Jamestown, Rhode Island, sits on Conanicut Island in Narragansett Bay and is characterized by a mix of rocky headlands and small sandy coves that influence local water conditions. Sea temperatures vary through the year: in winter surface temperatures commonly range from about 0°C to 5°C, spring sees a rise into roughly 5°C to 15°C, summer brings the warmest waters typically between 18°C and 24°C, and autumn cools back to around 10°C to 16°C. These figures can shift with seasonal weather patterns, tidal exchange with the larger bay and ocean, and exposure—shallower, sheltered areas warm faster in sunny spells while open, tidal channels stay cooler and change more rapidly.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 3°C | 5°C | 7°C |
| February | 2°C | 4°C | 6°C |
| March | 2°C | 5°C | 7°C |
| April | 4°C | 7°C | 11°C |
| May | 6°C | 11°C | 16°C |
| June | 10°C | 17°C | 21°C |
| July | 15°C | 21°C | 24°C |
| August | 18°C | 22°C | 25°C |
| September | 16°C | 20°C | 24°C |
| October | 9°C | 18°C | 21°C |
| November | 7°C | 13°C | 16°C |
| December | 4°C | 8°C | 12°C |
* Click on a month to view detailed water temperature data.
Jamestown: Weather Forecast
June 14
June 15
June 16
June 17
Location, Beaches & Local Information
Nearby Beaches & Facilities
Taylor Point
Fort Wetherill State Park
Mackerel Cove Beach
Fort Adams Beach
Collins Beach
Brenton Point State Park
Plum Beach
Heads Beach
Kelly Beach
Swimming Conditions
Swimming and beach recreation in Jamestown are therefore highly seasonal, with the main swimming window during mid-summer when water temperatures are most comfortable for most visitors. Public beaches and state park shorelines offer spots for casual swims, wading, snorkeling and launching small craft, though some popular viewpoints are rockier than sandy and facilities or lifeguards may only operate in peak months. Outside the warmest weeks, many people choose wetsuits for extended swims in spring or autumn, and swimmers should be mindful of currents, changing tides and nearby boat traffic. For a pleasant beach holiday here, plan visits for summer months if you want higher water temperatures and more services, and always check local conditions before entering the water.