All data are in degrees Fahrenheit

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Water temperature in Osaka

Detailed information about the current water temperature in Osaka. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Osaka now

83.9

°F

September 18, 23:31

Trend:

decreasing

Yesterday:

84.3°F

Tomorrow:

83.6°F

Sunrise:

05:42

Sunset:

18:02

Day Length:

12 h. 20 min.

Osaka in September

Minimum:

50.1°F

Average:

55.3°F

Maximum:

59.9°F

Sea water temperature in Osaka today

As of now, in Osaka, the water temperature is 83.9°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 4.5°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 85.7°F on 2024, while the historical minimum was 75.2°F on 2015.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 82.8°F, the minimum temperature may reach 81.7°F, and the maximum might stay at 83.6°F.

Daily water temperature in Osaka

Date Current Year

actual* / forecast**

last year 10 years average
Sep 4 85.4°F 82.2°F 81.8°F
Sep 5 84.9°F 82.5°F 81.9°F
Sep 6 83.5°F 82.9°F 81.7°F
Sep 7 83.6°F 84.2°F 81.5°F
Sep 8 83.8°F 83.7°F 81.2°F
Sep 9 85.1°F 83.6°F 81.2°F
Sep 10 86.4°F 84.4°F 81.2°F
Sep 11 85.4°F 84.4°F 81.1°F
Sep 12 84.9°F 84.3°F 80.9°F
Sep 13 84.2°F 84.1°F 80.8°F
Sep 14 83.9°F 84.0°F 80.5°F
Sep 15 83.2°F 86.1°F 80.2°F
Sep 16 84.7°F 84.5°F 80.1°F
Sep 17 84.3°F 86.1°F 80.0°F
Sep 18 83.9°F 85.7°F 79.4°F
Sep 19 83.6°F 85.2°F 79.1°F
Sep 20 83.3°F 85.4°F 78.8°F
Sep 21 83.1°F 85.7°F 78.6°F
Sep 22 82.8°F 84.6°F 78.3°F
Sep 23 82.7°F 83.6°F 78.1°F
Sep 24 82.2°F 82.4°F 77.7°F
Sep 25 81.7°F 81.9°F 77.2°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Osaka by month

In Osaka, the months July through October offer comfortable swimming conditions, which amounts to 114 swimming days.
The warmest water in Osaka was recorded on September 1, 2025, reaching a 87.0°F. While the coldest temperature occurred on February 15, 2025, dipping to 42.4°F. The average readings by season are 55.3°F in Winter, 58.9°F in Spring, 78.1°F in Summer, and 73.4°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Amagasaki 83.8°F 5mi
Sakai 83.9°F 8mi
Nishinomiya-hama 83.5°F 10mi
Kobe 82.6°F 18mi
Kyoto 84.4°F 27mi
Ōtsu 84.4°F 30mi
Himeji 84.2°F 46mi
Maizuru 84.5°F 53mi
Tokushima 82.1°F 69mi

* current water temperature in this city

** straight line distance from Osaka