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 22.2°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.

72.0

°F

June 5, 17:32

Trend:

increasing

Yesterday:

71.9°F

Tomorrow:

72.3°F

Sunrise:

04:56

Sunset:

19:15

Day Length:

14 h. 19 min.

Niihama in June

Minimum:

54.5°F

Average:

56.3°F

Maximum:

58.2°F

Sea water temperature in Niihama today

As of now, in Niihama, the water temperature is 72.0°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 2.2°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 71.2°F on 2021, while the historical minimum was 67.7°F on 2025.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the highest 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 72.7°F, with minimum temperature starting at 72.2°F, while the maximum might reach 73.2°F.

Daily water temperature in Niihama

Date	Current Year actual* / forecast**	last year	10 years average
May 22	68.6°F	65.0°F	65.8°F
May 23	67.6°F	66.4°F	66.5°F
May 24	66.8°F	66.6°F	66.9°F
May 25	67.5°F	66.7°F	67.5°F
May 26	67.4°F	66.4°F	67.7°F
May 27	67.6°F	66.5°F	67.8°F
May 28	67.8°F	66.7°F	68.0°F
May 29	69.2°F	66.8°F	68.3°F
May 30	72.3°F	66.8°F	68.6°F
May 31	72.2°F	67.6°F	69.0°F
Jun 1	72.9°F	66.5°F	68.7°F
Jun 2	73.1°F	67.1°F	68.9°F
Jun 3	73.0°F	67.3°F	69.6°F
Jun 4	71.9°F	67.1°F	69.7°F
Jun 5	72.0°F	67.7°F	69.8°F
Jun 6	72.3°F	68.8°F	70.2°F
Jun 7	72.5°F	69.2°F	70.3°F
Jun 8	72.2°F	69.4°F	70.0°F
Jun 9	72.6°F	69.4°F	70.4°F
Jun 10	72.9°F	69.5°F	70.7°F
Jun 11	73.2°F	69.5°F	71.0°F
Jun 12	73.2°F	69.6°F	71.0°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 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	71.6°F	8mi
Matsuyama	66.6°F	32mi
Marugame	70.4°F	35mi
Fukuyama	70.5°F	36mi
Takamatsu	70.0°F	50mi
Kurashiki	69.9°F	50mi
Hiroshima	68.9°F	58mi
Okayama	70.1°F	60mi

* current water temperature in this city

** straight line distance from Niihama