Longboat Key — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Longboat Key (Florida, 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 Longboat Key help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Longboat Key in the Gulf of America today is 30°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating.
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 Longboat Key today is lower than both a week ago and a month ago. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Longboat Key will be 30.5°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 |
|---|---|---|---|
| JUL 14 | 31.6°C | 30.8°C | |
| JUL 15 | 31.6°C | 30.5°C | |
| JUL 16 | 31.4°C | 30.3°C | |
| JUL 17 | 31.4°C | 30.5°C | |
| JUL 18 | 31.4°C | 30.5°C | |
| JUL 19 | 31.3°C | 30.0°C | |
| JUL 20 | 31.3°C | 30.5°C | |
| JUL 21 | 31.0°C | 30.5°C | |
| JUL 22 | 30.4°C | 30.5°C | 30.4°C |
| JUL 23 | 30.5°C | 30.4°C | |
| JUL 24 | 31.0°C | 30.4°C | |
| JUL 25 | 30.5°C | 30.4°C | |
| JUL 26 | 31.0°C | 30.4°C | |
| JUL 27 | 31.0°C | 30.5°C | |
| JUL 28 | 30.5°C | 30.5°C | |
| JUL 29 | 30.8°C | 30.5°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
Longboat Key is a barrier island on Florida’s Gulf Coast known for its long sandy beaches and sheltered coastal waters. Sea surface temperatures follow a clear seasonal pattern: winter months (December–February) typically range from about 17 to 22 °C, spring (March–May) warms to roughly 20 to 26 °C, summer (June–August) is the warmest period with averages near 27 to 31 °C, and autumn (September–November) usually cools gradually from about 23 to 28 °C. Local conditions can vary with tides, weather and occasional cold fronts or warm spells, and shallow bays and the island’s protected waters often show slightly different temperatures than the open Gulf.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 15°C | 17°C | 23°C |
| February | 15°C | 19°C | 23°C |
| March | 16°C | 21°C | 27°C |
| April | 20°C | 24°C | 28°C |
| May | 22°C | 27°C | 30°C |
| June | 26°C | 29°C | 32°C |
| July | 28°C | 31°C | 33°C |
| August | 27°C | 31°C | 34°C |
| September | 27°C | 30°C | 32°C |
| October | 23°C | 28°C | 31°C |
| November | 19°C | 23°C | 27°C |
| December | 15°C | 20°C | 24°C |
* Click on a month to view detailed water temperature data.
Longboat Key: Weather Forecast
July 23
July 24
July 25
July 26
Location, Beaches & Local Information
Nearby Beaches & Facilities
Whitney Beach
Beer Can Island Beach
Longboat Key
Coquina Beach
Seahorse Shore Beach
Bradenton Beach
Cortez Beach
Da Beach
Swimming Conditions
Swimming around Longboat Key suits a wide range of visitors for most of the year. Summer water temperatures are comfortably warm for prolonged swims and family beach days, while spring and autumn offer pleasant conditions for swimming, snorkeling, paddleboarding and other water activities. In winter the water can feel brisk and some people prefer short swims or a light wetsuit when temperatures dip toward the upper teens °C. Gulf waters off the island are generally calm and shallow near shore, which is good for beginners, but swimmers should remain aware of local advisories such as rip currents, changing surf and rare harmful algal bloom events that can affect water quality and safety.