Verdict: Excellent month
Warsaw Weather in September
September hits the sweet spot in Warsaw — highs around 21°C (70°F), ideal for a full day on foot. Rain is occasional — about 8 wet days in a typical year. Overall, September is one of the best months of the year to be in Warsaw.
Average high
21°C / 70°F
Average low
11°C / 52°F
Rain days
~8
Precipitation
51 mm
What to pack for Warsaw in September
- Layers — t-shirts under a light jacket or sweater
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Warsaw: Jul (26°C / 79°F) · Coolest: Jan (3°C / 37°F) · Wettest: Jan (~14 rain days)
3°
-1°
Jan
5°
-1°
Feb
9°
0°
Mar
13°
4°
Apr
19°
9°
May
24°
14°
Jun
26°
16°
Jul
25°
16°
Aug
21°
11°
Sep
14°
7°
Oct
7°
2°
Nov
3°
-1°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)