September · Poland
Best time to visit Gdynia in September Weather, crowds & prices
Weather in Gdynia in September
Average temperature 16°C, 51 mm of rain, about 8 days with 6+ hours of sunshine and 78% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.5/10
Ranked #6 of 12 months
- Avg temp
- 16°C
- Rainfall
- 51 mm
- Humidity
- 78%
- Days with 6h+ sun
- 8
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Gdynia scores 4.5/10 for beach and coastal travel - an above-average month (#6 of 12). Expect around 16°C, 51 mm of rain, and roughly 8 days with 6+ hours of sunshine this month.
Gdynia grew as Poland's modern port, with modernist architecture, a long beach and the Błyskawica destroyer.
September in Gdynia — off-season conditions
September averages 16°C (61°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 51 mm, so plan one flexible day in three; you still get about 8 days with 6+ hours of sunshine and 12.4 hours of daylight.
It scores 4.5/10 here, 6th of 12 months, against 6.8/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Figure on mid-season pricing, with crowds are moderate.
Flexible dates? August scores 2.3 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Gdynia in September?
- In September, Gdynia averages 16°C, 51 mm of rain, and about 8 days with 6+ hours of sunshine. Its climate-comfort score is 4.5/10.
- Is September a good time to visit Gdynia?
- September earns a 4.5/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Gdynia in September?
- Expect about 51 mm of rain in September. Average humidity is 78% and there are about 8 days with 6+ hours of sunshine.
Curated in Gdynia
Tickets & experiences
Things to do in Gdynia
Gdynia, Poland. Live activities and tours from GetYourGuide, matched to this destination.