September
Weather in September
September in Knokke-Heist marks the transition from sultry summer days to cooler autumnal months. While September boasts longer daylight hours than October, temperatures and sea tides tend to drop gradually throughout the month. Expect a slight nip in the air, a stark contrast to the weather enjoyed during August. September seasonality keeps the sea temperature at a comfortable 18.2°C (64.8°F), inviting tourists and locals for late-summer dips. The blend of warm afternoons and cool evenings paints an enchanting picture of Knokke-Heist in autumn.
Note: Swimming in 18.2°C (64.8°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).
On the first day of September in Knokke-Heist, sunrise is at 07:00 and sunset at 20:32. On the last day of the month, sunrise is at 07:46 and sunset at 19:26 CEST.
Sea temperature
In Knokke-Heist, in September, the average water temperature is 18.2°C (64.8°F).Note: Swimming in 18.2°C (64.8°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).
Daylight
In September, the average length of the day is 12h and 38min.On the first day of September in Knokke-Heist, sunrise is at 07:00 and sunset at 20:32. On the last day of the month, sunrise is at 07:46 and sunset at 19:26 CEST.
Updated: Jan 29, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the sea temperature in September in Knokke-Heist?
In Knokke-Heist, Belgium, the average seawater temperature in September is 18.2°C (64.8°F). For most, swimming in 18.2°C (64.8°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
How many hours of daylight does Knokke-Heist have in September?
The average day length in September in Knokke-Heist, Belgium, is 12h and 38min.
What time are sunrise and sunset in September in Knokke-Heist?
On the first day of September, sunrise is at 07:00 and sunset at 20:32. On the last day of the month, sunrise is at 07:46 and sunset at 19:26 CEST.
Average sea temperature in September
Knokke-Heist, Belgium
- Average sea temperature in September: 18.2°C
The best month for swimming (with the highest average sea temperature) is August (18.4°C).
The coldest month (with the lowest average sea temperature) is March (7.1°C).
Average daylight in September
Knokke-Heist, Belgium
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 30min).
The month with the shortest days is December (Average daylight: 8h and 0min).
