Water temperature in Lake Biwa

This data the coastal Lake Biwa water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current water temperature in Lake Biwa

Water temperature in Lake Biwa today is 25.6°C. Based on our historical data over a period of ten years, the warmest water in this day in Lake Biwa was recorded in 2023 and was 27.7°C, and the coldest was recorded in 2015 at 22.9°C. Water temperature in Lake Biwa is expected to drop to 23°C in the next 10 days. September average water temperature in Lake Biwa is 25.8°C, the minimum temperature is 22.8°C, and the maximum is 30.4°C.

The swimming season in Lake Biwa lasts from June to October. During those months, Lake Biwa water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Lake Biwa in winter reaches 11.1°C, in spring 13.1°C, in summer the average temperature rises to 24.9°C, and in autumn it is 21.5°C.

Lake Biwa water temperature now

Surf Forecast in Lake Biwa for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Lake Biwa. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Lake Biwa. Data in table shown for 27 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Lake Biwa

Lake Biwa weather forecast

Current temperature and weather

Data in a table show Lake Biwa temperature today (27 September 2025). For more information and forecast for a few days, go to the weather forecast Lake Biwa.

0-3 h	3-6 h	6-9 h	9-12 h
19.2°C	18.3°C	19°C	19.9°C

12-15 h	15-18 h	18-21 h	21-24 h
22°C	21.1°C	17.7°C	18.8°C

Lake Biwa water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Lake Biwa. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Lake Biwa on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Lake Biwa

The nearest beaches and cities from Lake Biwa with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Suishohama beach	27.2°C	24°C		0.63 m
Amagasaki	24.9°C	27°C		0.05 m
Nishinomiya	25.3°C	27°C		0.05 m
Izumi	24.9°C	27°C		0.09 m
Sakai	24.9°C	27°C		0.09 m
Kobe Shi	25.9°C	26°C		0.13 m
Izumiotsu	25.1°C	27°C		0.12 m
Kaizuka	25.5°C	26°C		0.12 m
Kishiwada	25.5°C	26°C		0.12 m
Tokoname	25.2°C	28°C		0.12 m

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Our report for Lake Biwa is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.