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 13.77°C. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

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.

56.8

°F

December 14, 08:56

Trend:

decreasing

Yesterday:

57.0°F

Tomorrow:

56.8°F

Sunrise:

06:56

Sunset:

16:46

Day Length:

9 h. 50 min.

Ōtsu in December

Minimum:

51.1°F

Average:

53.3°F

Maximum:

55.2°F

Sea water temperature in Ōtsu today

As of now, in Ōtsu, the water temperature is 56.8°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 1.0°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 is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 59.4°F on 2018, while the historical minimum was 56.3°F on 2023.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly lower than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 56.4°F, the minimum temperature may reach 55.9°F, and the maximum might stay at 56.8°F.

Daily water temperature in Ōtsu

Date	Current Year actual* / forecast**	last year	10 years average
Nov 30	59.8°F	60.5°F	60.5°F
Dec 1	59.8°F	60.5°F	60.5°F
Dec 2	59.9°F	60.3°F	60.4°F
Dec 3	59.9°F	58.6°F	60.1°F
Dec 4	59.9°F	58.4°F	59.9°F
Dec 5	59.8°F	58.2°F	59.8°F
Dec 6	59.1°F	58.0°F	59.6°F
Dec 7	58.9°F	57.8°F	59.5°F
Dec 8	58.0°F	57.6°F	59.1°F
Dec 9	58.0°F	57.5°F	58.8°F
Dec 10	57.5°F	57.1°F	58.4°F
Dec 11	57.3°F	56.9°F	58.3°F
Dec 12	57.2°F	57.1°F	58.1°F
Dec 13	57.0°F	57.0°F	58.0°F
Dec 14	56.8°F	56.9°F	57.8°F
Dec 15	56.8°F	56.9°F	57.8°F
Dec 16	56.7°F	56.8°F	57.7°F
Dec 17	56.6°F	56.8°F	57.6°F
Dec 18	56.4°F	56.7°F	57.4°F
Dec 19	56.3°F	56.1°F	57.3°F
Dec 20	56.3°F	56.1°F	57.3°F
Dec 21	55.9°F	55.1°F	56.9°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 105 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 53.7°F in Winter, 57.0°F in Spring, 76.9°F in Summer, and 71.1°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Kyoto	56.8°F	7mi
Osaka	59.3°F	30mi
Amagasaki	59.2°F	32mi
Nishinomiya-hama	59.4°F	36mi
Sakai	59.5°F	37mi
Tsu	58.3°F	41mi
Maizuru	62.0°F	43mi
Kobe	60.1°F	44mi

* current water temperature in this city

** straight line distance from Ōtsu