Niihama
Japan
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Niihama, Japan

The best months for a swim in Niihama, Japan, are July through September, with a perfect temperature - varying between 25°C (77°F) and 29°C (84.2°F), and scarce rainfall.

In Niihama, Japan, the average seawater temperature in January is 16.5°C (61.7°F). Note: For swimming, a surface water temperature of 16.5°C (61.7°F) is not enjoyable for the majority. Weather in January »

Months with the coldest seawater in Niihama, Japan, are February and March, with an average sea temperature of 15.8°C (60.4°F). Note: For swimming, a surface water temperature of 15.8°C (60.4°F) is not enjoyable for the majority. Weather in February »

February and March, with an average sea temperature of 15.8°C (60.4°F), are months with the coldest seawater in Niihama, Japan. Note: Swimming in 15.8°C (60.4°F) is not enjoyable for the majority. Weather in March »

In Niihama, Japan, in April, the average water temperature is 17.4°C (63.3°F). Note: For most, swimming in 17.4°C (63.3°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F). Weather in April »

In Niihama, Japan, in May, the average water temperature is 20°C (68°F). Note: Swimming in 20°C (68°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F). Weather in May »

In Niihama, Japan, the average seawater temperature in June is 23.2°C (73.8°F). Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.2°C (73.8°F) water. Weather in June »

The ideal sea water temperature of 26.2°C (79.2°F) make July the best time for swimming and other water activities in Niihama, Japan. In July, the average sea temperature is 26.2°C (79.2°F). Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods. Weather in July »

The ideal sea water temperature of 27.5°C (81.5°F) make August the best time for swimming and other water activities in Niihama, Japan. The month with the warmest seawater is August, with an average sea temperature of 27.5°C (81.5°F). Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods. Weather in August »

The ideal sea water temperature of 26.6°C (79.9°F) make September the best time for swimming and other water activities in Niihama, Japan. In Niihama, the average seawater temperature is 26.6°C (79.9°F). Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. Weather in September »

In Niihama, Japan, the average seawater temperature in October is 24.4°C (75.9°F). Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.4°C (75.9°F) water. Weather in October »

In Niihama, Japan, the average seawater temperature in November is 22.1°C (71.8°F). Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. Weather in November »

In December, the average sea temperature in Niihama, Japan, is 19.2°C (66.6°F). Note: For swimming, a surface water temperature of 19.2°C (66.6°F) is not enjoyable for the majority. Weather in December »

When is the sea coldest in Niihama?

February and March, with an average sea temperature of 15.8°C (60.4°F), are months with the coldest seawater.

When are the longest days in Niihama?

June has the longest days of the year, with an average of 14.4h of daylight.

What month is the sea warmest in Niihama?

August is the month with the warmest seawater in Niihama, Japan, with an average sea temperature of 27.5°C (81.5°F).

What is the month with the shortest days in Niihama?

December has the shortest days of the year in Niihama, Japan, with an average of 9.9h of daylight.
Average sea temperature - Niihama, Japan

The best month for swimming (with the highest average sea temperature) is August (27.5°C).
Coldest months (with the lowest average sea temperature) are February and March (15.8°C).

Average daylight - Niihama, Japan

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).