September weather forecast
Gdynia, Poland

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Weather in September

Entering autumn, September witnesses a marked shift in Gdynia's weather. Significant drops in temperature are evident, with highs averaging 18.4°C (65.1°F). However, the sea still invites with its 17.3°C (63.1°F) mean temperature, permitting extended seaside excursions. The town begins to shed its summer vibrancy, adopting a more tranquil, contemplative mood in the face of advancing autumn. Gdynia, in September, is a picturesque blend of summer reminiscences and mellow autumn hues.

Temperature

The arrival of September is marked by a minor reduction in average high-temperature, sliding from a pleasant 22.5°C (72.5°F) in August to an enjoyable 18.4°C (65.1°F). During the month of September, Gdynia's nighttime temperature lowers to an average of 11.8°C (53.2°F).

Humidity

In September, the average relative humidity in Gdynia is 82%.

Rainfall

In Gdynia, in September, it is raining for 14 days, with typically 71mm (2.8") of accumulated precipitation. Throughout the year, in Gdynia, there are 183 rainfall days, and 697mm (27.44") of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Gdynia, Poland.

Sea temperature

In September, the average sea temperature is 17.3°C (63.1°F).
Note: The majority find it unenjoyable to swim in 17.3°C (63.1°F). Breathing becomes tougher as the water temperature descends under 21°C (69.8°F).

Daylight

The average length of the day in September is 12h and 43min.
On the first day of September in Gdynia, sunrise is at 05:54 and sunset at 19:37. On the last day of the month, sunrise is at 06:47 and sunset at 18:24 CEST.

Frequently asked questions

What is the temperature in September in Gdynia?

The high-temperature, in September, in Gdynia, is 18.4°C (65.1°F), while the low-temperature averages to 11.8°C (53.2°F).

What is the average humidity in September in Gdynia?

In Gdynia, Poland, the average relative humidity in September is 82%.

How much does it rain in Gdynia in September?

In Gdynia, in September, it is raining for 14 days, with typically 71mm (2.8") of accumulated precipitation.

When it does not snow in Gdynia?

May through September are months without snowfall in Gdynia, Poland.

Does it snow in Gdynia in September?

In Gdynia, in September, it doesn't snow. In October, it regularly snows.

What is the sea water temperature in September in Gdynia?

In Gdynia, Poland, the average seawater temperature in September is 17.3°C (63.1°F). For swimming, a surface water temperature of 17.3°C (63.1°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Gdynia have in September?

In September, the average day length in Gdynia is 12h and 43min.

When are sunrise and sunset in September in Gdynia?

In September, on the first day of the month, sunrise is at 05:54 and sunset at 19:37. On the last day of the month, sunrise is at 06:47 and sunset at 18:24 CEST.
Average humidity
Average rainfall days
Average snowfall days
Average daylight

Average temperature in September
Gdynia, Poland

Average temperature in September - Gdynia, Poland
  • Average high temperature in September: 18.4°C

The warmest month (with the highest average high temperature) is July (22.7°C).
The month with the lowest average high temperature is January (2°C).

  • Average low temperature in September: 11.8°C

The month with the highest average low temperature is July (14.8°C).
The coldest month (with the lowest average low temperature) is January (-3.2°C).

Average humidity in September
Gdynia, Poland

Average humidity in September - Gdynia, Poland
  • Average humidity in September: 82%

The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is May (63%).

Average rainfall in September
Gdynia, Poland

Average rainfall in September - Gdynia, Poland
  • Average rainfall in September: 71.2mm

The wettest month (with the highest rainfall) is August (74.9mm).
The driest month (with the least rainfall) is April (36.6mm).

Average rainfall days in September
Gdynia, Poland

Average rainfall days in September - Gdynia, Poland
  • Average rainfall days in September: 14 days

The month with the highest number of rainy days is November (19 days).
The month with the least rainy days is February (11 days).

Average snowfall days in September
Gdynia, Poland

Average snowfall days in September - Gdynia, Poland
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (13 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average sea temperature in September
Gdynia, Poland

Average sea temperature in September - Gdynia, Poland
  • Average sea temperature in September: 17.3°C

The best month for swimming (with the highest average sea temperature) is August (19.1°C).
The coldest month (with the lowest average sea temperature) is March (2.2°C).

Average daylight in September
Gdynia, Poland

Average daylight in September - Gdynia, Poland
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 17h and 12min).
The month with the shortest days is December (Average daylight: 7h and 24min).

Gdynia, Poland

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