What is the current water temperature in Ōtsu?

Q: What is the current water temperature in Ōtsu?

As of now, in Ōtsu, the water temperature is 21.79°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 > Ōtsu

Water temperature in Ōtsu

Detailed information about the current water temperature in Ōtsu. 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.

71.2

°F

May 18, 09:06

Trend:

increasing

Yesterday:

71.1°F

Tomorrow:

71.6°F

Sunrise:

04:51

Sunset:

18:55

Day Length:

14 h. 4 min.

Ōtsu in May

Minimum:

52.5°F

Average:

54.4°F

Maximum:

55.9°F

Sea water temperature in Ōtsu today

As of now, in Ōtsu, the water temperature is 71.2°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 7.3°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 67.1°F on 2019, while the historical minimum was 61.2°F on 2017.

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 73.0°F, with minimum temperature starting at 71.6°F, while the maximum might reach 74.4°F.

Daily water temperature in Ōtsu

Date	Current Year actual* / forecast**	last year	10 years average
May 4	61.5°F	61.2°F	61.1°F
May 5	64.0°F	63.0°F	61.7°F
May 6	63.7°F	62.7°F	62.0°F
May 7	63.0°F	64.2°F	62.4°F
May 8	62.9°F	62.2°F	62.2°F
May 9	64.1°F	62.2°F	62.5°F
May 10	64.0°F	62.2°F	62.4°F
May 11	64.0°F	62.0°F	62.3°F
May 12	65.7°F	62.6°F	62.8°F
May 13	65.9°F	63.4°F	62.8°F
May 14	67.6°F	63.0°F	63.2°F
May 15	68.7°F	65.8°F	63.7°F
May 16	69.0°F	65.3°F	64.0°F
May 17	71.1°F	64.9°F	63.8°F
May 18	71.2°F	64.6°F	63.9°F
May 19	71.6°F	64.5°F	64.3°F
May 20	72.1°F	66.5°F	64.7°F
May 21	72.2°F	66.0°F	64.8°F
May 22	73.0°F	65.7°F	65.7°F
May 23	73.6°F	68.5°F	66.3°F
May 24	73.9°F	68.2°F	66.6°F
May 25	74.4°F	67.9°F	67.0°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 Ōtsu by month

In Ōtsu, the months July through September offer comfortable swimming conditions, which amounts to 106 swimming days.

The warmest water in Ōtsu was recorded on August 3, 2025, reaching a 89.2°F. While the coldest temperature occurred on January 30, 2025, dipping to 43.9°F. The average readings by season are 53.6°F in Winter, 57.3°F in Spring, 77.4°F in Summer, and 71.3°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Kyoto	71.2°F	7mi
Osaka	68.6°F	30mi
Amagasaki	68.2°F	32mi
Nishinomiya-hama	67.5°F	36mi
Sakai	69.0°F	37mi
Tsu	67.5°F	41mi
Maizuru	63.9°F	43mi
Kobe	66.8°F	44mi

* current water temperature in this city

** straight line distance from Ōtsu