Poland
Gdańsk in September: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Gdańsk in September is climatically well suited to city breaks and active holidays and hiking. The average daily high is around 17 °C, and the sea is about 17 °C. With about 12 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
51/100 · #4
Warmth
#4
Dryness
#5
Sun
#6
Sea warmth
#3
Published best categories: City break, Active
Gdańsk · SeptemberPhoto: Krzysztof Maria Różański, ( Upior polnocy ) · CC BY-SA 3.0Climate facts
- Average high
- 17 °C
- Average low
- 12 °C
- Sea
- 17 °C
- Rainy days (est.)
- 12 rainy days (est.)
- Sun (est.)
- 4 h/day
- Humidity
- 79 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 21 | 16 | 13 | 73 | 5.6 | 78 | 3.7 | 19 | 65 |
| September (selected) | 17 | 12 | 12 | 62 | 3.9 | 79 | 4.4 | 17 | 51 |
| October | 12 | 8 | 13 | 66 | 2.0 | 84 | 5.0 | 13 | 29 |
How do the previous and next months compare?
Baseline: September (51/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | +14 | +3.7 °C | +3.4 °C | +1.1 | +11.3 mm | +1.7 h | -1.6 % | -0.6 m/s | +2.4 °C |
| October | -22 | -5.4 °C | -4.6 °C | +1.2 | +4 mm | -1.9 h | +4.6 % | +0.6 m/s | -3.8 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Gdańsk in September?
The average daily high is around 17 °C, with an average daily low of about 12 °C.
Can you swim in Gdańsk in September?
The sea is about 17 °C (cold).
Does it rain a lot in Gdańsk in September?
The curated estimate is about 12 rainy days per month, not a directly measured long-term average. Total precipitation averages around 62 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Gdańsk?
By the climate score, July and August are the strongest months for Gdańsk. September is not among them.