What is the current water temperature in Osaka?

Q: What is the current water temperature in Osaka?

As of now, in Osaka, the water temperature is 21.27°C. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool.

Japan > Osaka

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.

70.3

°F

May 21, 00:25

Trend:

stable

Yesterday:

70.3°F

Tomorrow:

70.9°F

Sunrise:

04:52

Sunset:

18:58

Day Length:

14 h. 6 min.

Osaka in May

Minimum:

51.4°F

Average:

55.4°F

Maximum:

60.4°F

Sea water temperature in Osaka today

As of now, in Osaka, the water temperature is 70.3°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 4.8°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 rise a bit.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 67.5°F on 2025, while the historical minimum was 63.4°F on 2024.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 72.0°F, with minimum temperature starting at 70.9°F, while the maximum might reach 72.8°F.

Daily water temperature in Osaka

Date	Current Year actual* / forecast**	last year	10 years average
May 7	62.1°F	65.4°F	63.4°F
May 8	64.0°F	62.0°F	63.0°F
May 9	62.7°F	61.8°F	62.8°F
May 10	63.0°F	61.7°F	62.7°F
May 11	64.0°F	62.3°F	63.3°F
May 12	64.2°F	62.9°F	63.9°F
May 13	64.0°F	63.3°F	64.4°F
May 14	65.9°F	63.1°F	64.5°F
May 15	67.4°F	66.2°F	65.0°F
May 16	66.8°F	65.9°F	65.0°F
May 17	68.5°F	66.1°F	65.6°F
May 18	68.7°F	66.1°F	65.8°F
May 19	69.6°F	65.8°F	66.0°F
May 20	70.3°F	67.2°F	65.6°F
May 21	70.3°F	67.5°F	65.5°F
May 22	70.9°F	68.4°F	66.2°F
May 23	71.5°F	68.3°F	66.7°F
May 24	71.8°F	68.1°F	67.0°F
May 25	72.1°F	67.9°F	67.3°F
May 26	72.3°F	66.8°F	67.6°F
May 27	72.4°F	66.7°F	67.6°F
May 28	72.8°F	66.7°F	68.0°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 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 54.7°F in Winter, 58.6°F in Spring, 78.3°F in Summer, and 73.6°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Amagasaki	70.0°F	5mi
Sakai	70.8°F	8mi
Nishinomiya-hama	68.7°F	10mi
Kobe	67.4°F	18mi
Kyoto	72.4°F	27mi
Ōtsu	72.4°F	30mi
Himeji	69.0°F	46mi
Maizuru	66.9°F	53mi
Tokushima	67.4°F	69mi

* current water temperature in this city

** straight line distance from Osaka