Fukuoka — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Fukuoka (Japan). 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 Fukuoka help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Fukuoka in the Sea of Japan today is 22°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience.
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 Fukuoka 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 Fukuoka will be 21.3°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 2 | 21.1°C | 19.8°C | |
| JUN 3 | 21.0°C | 20.0°C | |
| JUN 4 | 21.2°C | 19.8°C | |
| JUN 5 | 21.4°C | 20.3°C | |
| JUN 6 | 21.2°C | 20.0°C | |
| JUN 7 | 21.7°C | 20.0°C | |
| JUN 8 | 21.8°C | 19.5°C | |
| JUN 9 | 21.8°C | 20.8°C | |
| JUN 10 | 21.9°C | 20.8°C | 21.9°C |
| JUN 11 | 20.0°C | 21.8°C | |
| JUN 12 | 20.3°C | 21.7°C | |
| JUN 13 | 20.5°C | 21.6°C | |
| JUN 14 | 20.3°C | 21.5°C | |
| JUN 15 | 21.3°C | 21.5°C | |
| JUN 16 | 21.0°C | 21.4°C | |
| JUN 17 | 21.5°C | 21.3°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
Fukuoka, on the northern shore of Kyushu, enjoys a temperate maritime climate that keeps coastal waters relatively mild year-round. Sea surface temperatures typically drop to their lowest in winter, averaging around 12–15 °C in January and February, then rise steadily through spring to roughly 15–21 °C by May. Early summer brings warmer water, with June to August generally between 22 and 28 °C and August sometimes peaking near 28–29 °C. In autumn the sea cools more gradually, with September and October commonly around 23–26 °C and November falling back toward 20–21 °C. These seasonal ranges reflect the influence of warm currents and the sheltering effect of bays, so short-term variation can occur with weather patterns and tides.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 9°C | 13°C | 16°C |
| February | 7°C | 12°C | 16°C |
| March | 7°C | 13°C | 16°C |
| April | 9°C | 15°C | 18°C |
| May | 11°C | 17°C | 21°C |
| June | 15°C | 21°C | 24°C |
| July | 19°C | 25°C | 29°C |
| August | 24°C | 27°C | 30°C |
| September | 22°C | 26°C | 29°C |
| October | 21°C | 24°C | 27°C |
| November | 15°C | 21°C | 23°C |
| December | 9°C | 17°C | 20°C |
* Click on a month to view detailed water temperature data.
Fukuoka: Weather Forecast
June 11
June 12
June 13
June 14
Location, Beaches & Local Information
Nearby Beaches & Facilities
Momochi Seaside Park
Saitozakiminami Park
Genkoborui Iki-no-Matsubara Area
Nokonoshima Camp Mura Beach Resort
Swimming Conditions
Swimming and beach holidays in the Fukuoka area are popular from late spring into early autumn, with the prime season for comfortable open-water swimming and sunbathing spanning June through September. Urban beaches such as Momochi in Fukuoka city provide easy access, facilities and lifeguard coverage in summer, while the nearby Itoshima peninsula offers more scenic sandy bays, surfing breaks and calmer coves suitable for snorkeling, paddleboarding and family outings. Water in June and September can feel brisk to some visitors, so wetsuits or shorter swims may be preferred outside of July and August when temperatures are at their warmest. Facilities, ferry links and shore services expand in high season, making Fukuoka a convenient choice for a mixed beach and city holiday.