What is the current water temperature in Niihama?

Q: What is the current water temperature in Niihama?

As of now, in Niihama, the water temperature is 22.8°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 > Niihama

Water temperature in Niihama

Detailed information about the current water temperature in Niihama. 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.

73.0

°F

July 9, 13:55

Trend:

stable

Yesterday:

73.4°F

Tomorrow:

73.3°F

Sunrise:

05:03

Sunset:

19:21

Day Length:

14 h. 18 min.

Niihama in July

Minimum:

54.0°F

Average:

56.0°F

Maximum:

57.8°F

Sea water temperature in Niihama today

As of now, in Niihama, the water temperature is 73.0°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 5.7°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 rise a bit.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 82.9°F on 2025, while the historical minimum was 76.5°F on 2020.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 73.8°F, with minimum temperature starting at 73.3°F, while the maximum might reach 74.4°F.

Daily water temperature in Niihama

Date	Current Year actual* / forecast**	last year	10 years average
Jun 25	71.9°F	73.9°F	73.7°F
Jun 26	73.0°F	76.3°F	74.2°F
Jun 27	72.2°F	77.1°F	74.3°F
Jun 28	73.2°F	77.3°F	74.6°F
Jun 29	71.2°F	79.9°F	75.2°F
Jun 30	71.8°F	80.7°F	75.8°F
Jul 1	70.8°F	82.6°F	76.2°F
Jul 2	71.4°F	82.8°F	76.6°F
Jul 3	71.0°F	81.9°F	76.8°F
Jul 4	71.5°F	84.1°F	77.4°F
Jul 5	72.9°F	83.0°F	77.6°F
Jul 6	73.3°F	83.3°F	78.2°F
Jul 7	74.9°F	81.6°F	78.4°F
Jul 8	73.4°F	84.3°F	79.1°F
Jul 9	73.0°F	82.9°F	78.8°F
Jul 10	73.3°F	84.3°F	79.0°F
Jul 11	73.5°F	84.4°F	79.2°F
Jul 12	73.5°F	83.5°F	79.2°F
Jul 13	73.6°F	83.6°F	79.3°F
Jul 14	74.1°F	83.2°F	79.8°F
Jul 15	74.2°F	81.7°F	79.9°F
Jul 16	74.4°F	79.9°F	80.2°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 Niihama by month

In Niihama, the months July through October offer comfortable swimming conditions, which amounts to 124 swimming days.

The warmest water in Niihama was recorded on August 3, 2024, reaching a 88.8°F. While the coldest temperature occurred on February 26, 2022, dipping to 48.0°F. The average readings by season are 55.9°F in Winter, 58.7°F in Spring, 78.8°F in Summer, and 75.1°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Saijō	71.9°F	8mi
Matsuyama	70.9°F	32mi
Marugame	75.3°F	35mi
Fukuyama	74.0°F	36mi
Takamatsu	74.3°F	50mi
Kurashiki	73.7°F	50mi
Hiroshima	72.4°F	58mi
Okayama	74.8°F	60mi

* current water temperature in this city

** straight line distance from Niihama