Ostend — Water Temperature in September

Water Temperature Range

16°C

minimum

18°C

average

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

September: Climate and Swimming Opportunities

Average Night Air Temperature

12°C

Average Day Air Temperature

19°C

Precipitation Amount per Month

66 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

5 hrs

Average Wind Speed

20 km/h

Average Humidity

81%

At such water and air temperatures, swimming often feels chilly and is best for short swims. Getting out can feel cold, so it helps to have dry clothes ready right away.