Seabrook — Water Temperature in September

Water Temperature Range

12°C

minimum

14°C

average

16°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

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

September: Climate and Swimming Opportunities

Average Night Air Temperature

8°C

Average Day Air Temperature

22°C

Precipitation Amount per Month

45 mm

Number of Rainy Days

Daylight per Day

12 hrs

Sunshine per Day

7 hrs

Average Wind Speed

10 km/h

Average Humidity

78%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.