Seabrook — Water Temperature in December

Water Temperature Range

7°C

minimum

10°C

average

12°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2025	2024	2023	2022
DEC 1	10°C	10°C	10°C	10°C
DEC 2	10°C	10°C	10°C	9°C
DEC 3	10°C	10°C	10°C	10°C
DEC 4	10°C	10°C	10°C	10°C
DEC 5	10°C	10°C	10°C	10°C
DEC 6	10°C	10°C	9°C	10°C
DEC 7	10°C	10°C	9°C	11°C
DEC 8	10°C	10°C	9°C	11°C
DEC 9	9°C	9°C	9°C	9°C
DEC 10	9°C	9°C	9°C	9°C
DEC 11	10°C	10°C	9°C	10°C
DEC 12	11°C	11°C	10°C	11°C
DEC 13	10°C	10°C	9°C	11°C
DEC 14	10°C	10°C	9°C	11°C
DEC 15	10°C	10°C	9°C	10°C
DEC 16	10°C	10°C	9°C	10°C
DEC 17	10°C	10°C	9°C	10°C
DEC 18	10°C	10°C	10°C	10°C
DEC 19	10°C	10°C	9°C	10°C
DEC 20	10°C	10°C	9°C	10°C
DEC 21	10°C	10°C	9°C	10°C
DEC 22	10°C	10°C	9°C	10°C
DEC 23	10°C	10°C	9°C	10°C
DEC 24	10°C	10°C	9°C	10°C
DEC 25	10°C	10°C	10°C	10°C
DEC 26	10°C	10°C	10°C	10°C
DEC 27	10°C	10°C	10°C	9°C
DEC 28	10°C	10°C	10°C	10°C
DEC 29	10°C	10°C	10°C	10°C
DEC 30	10°C	10°C	10°C	10°C
DEC 31	11°C	11°C	10°C	11°C

December: Climate and Swimming Opportunities

Average Night Air Temperature

1°C

Average Day Air Temperature

7°C

Precipitation Amount per Month

191 mm

Number of Rainy Days

Daylight per Day

8 hrs

Sunshine per Day

2 hrs

Average Wind Speed

12 km/h

Average Humidity

87%

At such water and air temperatures, swimming is extremely harsh and generally not enjoyable. The risk of rapid chilling is high, so most people avoid entering the water.