September weather forecastGdańsk, Poland
September
Weather in September
September brings the onset of autumn to Gdańsk, with temperatures gradually moving to a cooler range. The city becomes a palette of vibrant colors with pleasant weather conditions. Interestingly, September witnesses a decline in rainfall from 57mm (2.24") in August to 38mm (1.5"). The sea temperature begins reducing, signifying the closing window for water-based activities. Despite shorter day lengths, the city has much to offer in terms of cultural events and architectural sightseeing.Temperature
As September commences, the average high-temperature subtly reduces, transitioning from an agreeable 22.5°C (72.5°F) in August to an enjoyable 17.8°C (64°F). In Gdańsk, the average nighttime temperature during September is a cool 11.4°C (52.5°F).Humidity
In Gdańsk, Poland, the average relative humidity in September is 75%.Rainfall
In September, the rain falls for 15.7 days. Throughout September, 38mm (1.5") of precipitation is accumulated. Throughout the year, there are 172.5 rainfall days, and 497mm (19.57") of precipitation is accumulated.Snowfall
In Gdańsk, Poland, snow does not fall in June through September.Sea temperature
In September, the average sea temperature in Gdańsk is 17.4°C (63.3°F).Note: In water with a temperature of 17.4°C (63.3°F), swimming is not a joy for most people. The challenge of controlling breathing increases as the temperature dips from 21°C (69.8°F) to 15°C (59°F).
Daylight
In Gdańsk, the average length of the day in September is 12h and 42min.On the first day of the month, sunrise is at 05:54 and sunset at 19:36. On the last day of September, sunrise is at 06:46 and sunset at 18:23 CEST.
Sunshine
The average sunshine in September is 8h.UV index
In Gdańsk, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Gdańsk, Poland
- Average high temperature in September: 17.8°C
The warmest month (with the highest average high temperature) is August (22.5°C).
The month with the lowest average high temperature is January (0.6°C).
- Average low temperature in September: 11.4°C
The month with the highest average low temperature is August (14.4°C).
The coldest month (with the lowest average low temperature) is January (-2.4°C).
Average pressure in September
Gdańsk, Poland
- Average pressure in September: 1016.2mbar
The month with the highest atmospheric pressure is October (1016.6mbar).
The months with the lowest atmospheric pressure are July and December (1013.2mbar).
Average wind speed in September
Gdańsk, Poland
- Average wind speed in September: 13.8km/h
The windiest month (with the highest average wind speed) is December (16.8km/h).
The calmest month (with the lowest average wind speed) is August (12.1km/h).
Average humidity in September
Gdańsk, Poland
- Average humidity in September: 75%
The months with the highest relative humidity are January, February and December (87%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Gdańsk, Poland
- Average rainfall in September: 38mm
The wettest month (with the highest rainfall) is July (71mm).
The driest month (with the least rainfall) is April (20mm).
Average rainfall days in September
Gdańsk, Poland
- Average rainfall days in September: 15.7 days
The month with the highest number of rainy days is July (20.2 days).
The month with the least rainy days is February (8.9 days).
Average snowfall in September
Gdańsk, Poland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (128mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Gdańsk, Poland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Gdańsk, Poland
- Average sea temperature in September: 17.4°C
The best month for swimming (with the highest average sea temperature) is August (19.3°C).
The coldest month (with the lowest average sea temperature) is March (2.4°C).
Average daylight in September /
Average sunshine in September
Gdańsk, Poland
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 24min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Gdańsk, Poland
- Average sunshine days in September: 11.7 days
The month with the most sunshine days is April (15 days).
The month with the least sunshine days is December (7.5 days).
Average UV index in September
Gdańsk, Poland
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Gdańsk, Poland
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Gdańsk, Poland
- Average visibility in September: 10km
The months with the highest visibility are June, August and September (10km).
The months with the lowest visibility are January and February (8km).
