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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.
Sea temperature in Niihama now

54.8

°F

January 14, 02:15

Trend:

stable

Yesterday:

55.1°F

Tomorrow:

55.1°F

Sunrise:

07:12

Sunset:

17:19

Day Length:

10 h. 7 min.

Niihama in January

Minimum:

55.2°F

Average:

57.2°F

Maximum:

59.2°F

Sea water temperature in Niihama today

As of now, in Niihama, the water temperature is 54.8°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 0.4°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 considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 58.0°F on 2016, while the historical minimum was 51.4°F on 2025.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 55.1°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Niihama

Date Current Year

actual* / forecast**

 last year 10 years average
Jan 1 58.4°F 56.4°F 57.2°F
Jan 2 58.1°F 56.3°F 57.0°F
Jan 3 57.5°F 56.6°F 56.9°F
Jan 4 56.7°F 56.4°F 56.8°F
Jan 5 56.8°F 56.1°F 56.6°F
Jan 6 56.7°F 56.2°F 56.3°F
Jan 7 56.5°F 55.9°F 56.0°F
Jan 8 54.9°F 56.2°F 55.7°F
Jan 9 55.3°F 56.2°F 55.5°F
Jan 10 55.2°F 56.2°F 55.4°F
Jan 11 55.5°F 55.7°F 55.4°F
Jan 12 53.8°F 55.7°F 54.9°F
Jan 13 55.1°F 54.2°F 54.7°F
Jan 14 54.8°F 51.4°F 54.5°F
Jan 15 55.1°F 53.1°F 54.8°F
Jan 16 55.1°F 52.8°F 54.7°F
Jan 17 55.2°F 53.3°F 54.9°F
Jan 18 55.3°F 53.3°F 55.0°F
Jan 19 55.4°F 53.9°F 55.0°F
Jan 20 55.1°F 53.6°F 54.8°F
Jan 21 54.5°F 52.4°F 54.1°F
Dec 31 58.9°F 56.1°F 57.4°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

January

February

March

April

May

June

July

August

September

October

November

December

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, 58.6°F in Spring, 78.8°F in Summer, and 75.1°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Saijō 57.3°F 8mi
Matsuyama 57.8°F 32mi
Marugame 54.8°F 35mi
Fukuyama 53.9°F 36mi
Takamatsu 53.9°F 50mi
Kurashiki 54.9°F 50mi
Hiroshima 57.7°F 58mi
Okayama 53.1°F 60mi

* current water temperature in this city

** straight line distance from Niihama