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Gdynia Weather in September
Gdynia in September sees pleasant daytime temperatures of 18°C (64°F) and nighttime lows of 12°C (54°F). Rainfall is fairly high this month at around 74 mm (2.9 in), so pack a rain jacket to stay dry.
Rainfall in Gdynia in September
Rain is expected on roughly 15 days, totalling around 74 mm (2.9 in) for the month. With rain spread across many days but low totals, showers are typically short and light rather than heavy.
Temperature in Gdynia in September
Gdynia in September gets highs of 18°C (64°F) during the day and drops to 12°C (54°F) at night. The difference between afternoon and evening temperatures is usually noticeable. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Gdynia.
Gdynia Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
18°C (64°F)
Chance of Rain
51%
Precipitation
74 mm (2.9 in)
Rainy days
15 days
Humidity
78%
Gdynia Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gdynia - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Gdynia typically drop from around 19°C (66°F) at the start of September to approximately 15°C (59°F) by the end. Nights are cool, with lows typically ranging from 8°C (46°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Gdynia in September
Browse day-by-day weather records for Gdynia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gdynia historical weather extremes in September
The extremes listed below come from historical weather data collected in Gdynia from 1976 through 2026.
- The hottest September day on record in Gdynia reached 29°C (84°F) (September 11, 2012).
- The coldest September day was on September 30, 1993, with a maximum of 8°C (46°F).
- The coldest night in September in Gdynia was on September 27, 1986, with a minimum of -2°C (28°F).
Best Places in Poland in September
Find out more about the weather in Poland and which places have the best travel conditions in this month. See all of Poland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Gdynia in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days.
What To Do in Gdynia in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Gdynia 3-Day Forecast
More climate data for Gdynia
See the full Gdynia climate overview or explore weather in Poland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Poznań
20°C (68°F) Kraków
20°C (68°F) Warsaw20°C (68°F) Gdańsk19°C (66°F) Gdynia
18°C (64°F) Sopot19°C (66°F) Kołobrzeg19°C (66°F) Zakopane17°C (63°F) Bucket list
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