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

81.2

°F

September 10, 14:26

Trend:

stable

Yesterday:

81.2°F

Tomorrow:

81.1°F

Sunrise:

05:37

Sunset:

18:13

Day Length:

12 h. 36 min.

Osaka in September

Minimum:

50.1°F

Average:

55.0°F

Maximum:

59.9°F

Sea water temperature in Osaka today

As of now, in Osaka, the water temperature is 81.2°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.5°F lower 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 stay about the same.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 86.4°F on 2025, while the historical minimum was 79.0°F on 2021.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 80.5°F, the minimum temperature may reach 80.0°F, and the maximum might stay at 81.1°F.

Daily water temperature in Osaka

Date Current Year

actual* / forecast**

last year 10 years average
Aug 27 85.9°F 85.7°F 83.6°F
Aug 28 84.8°F 85.0°F 83.2°F
Aug 29 84.8°F 85.2°F 83.1°F
Aug 30 84.6°F 85.8°F 83.1°F
Aug 31 85.0°F 86.7°F 83.3°F
Sep 1 85.3°F 87.0°F 83.1°F
Sep 2 84.9°F 86.1°F 82.6°F
Sep 3 84.0°F 85.3°F 82.3°F
Sep 4 83.9°F 85.4°F 82.4°F
Sep 5 83.2°F 84.9°F 82.4°F
Sep 6 82.7°F 83.5°F 82.1°F
Sep 7 82.0°F 83.6°F 82.0°F
Sep 8 81.8°F 83.8°F 81.7°F
Sep 9 81.2°F 85.1°F 81.6°F
Sep 10 81.2°F 86.4°F 81.7°F
Sep 11 81.1°F 85.4°F 81.6°F
Sep 12 80.8°F 84.9°F 81.3°F
Sep 13 80.7°F 84.2°F 81.2°F
Sep 14 80.4°F 83.9°F 80.9°F
Sep 15 80.2°F 83.2°F 80.6°F
Sep 16 80.0°F 84.7°F 80.5°F
Sep 17 80.0°F 84.3°F 80.5°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 116 swimming days.
The warmest water in Osaka was recorded on July 24, 2026, reaching a 87.2°F. While the coldest temperature occurred on February 15, 2025, dipping to 42.4°F. The average readings by season are 54.7°F in Winter, 58.7°F in Spring, 78.4°F in Summer, and 73.6°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Amagasaki 81.1°F 5mi
Sakai 81.2°F 8mi
Nishinomiya-hama 81.0°F 10mi
Kobe 80.7°F 18mi
Kyoto 79.8°F 27mi
Ōtsu 79.8°F 30mi
Himeji 81.7°F 46mi
Maizuru 81.9°F 53mi
Tokushima 81.0°F 69mi

* current water temperature in this city

** straight line distance from Osaka