Climate averages 1991–2020
Warsaw weather
in September.
A mild, moderately wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Warsaw: daytime highs average 18.2°C and nights cool to about 10.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 57 mm of rain on roughly 10 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 43 min on an average September day.
The nearest other city in this atlas is Praga Południe (5 km away). In September its highs average 18.4°C, about as warm as Warsaw, with 57 mm of rain.
Among the 60 cities listed in Poland, Warsaw ranks joint 40th of 60 for the warmest September highs and joint 22nd of 60 for the driest September (rainfall, lowest first). The mean September high of those 60 cities is 18.3°C; Warsaw is 0.1°C cooler than that mean.
From September to October, average highs fall by 6.0°C to 12.2°C, and monthly rainfall falls from 57 mm to 45 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Warsaw climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 0.6°C-4.0°C | -4.0°C | 40 | 10.2 | 8.38 h |
| February | 2.3°C-3.5°C | -3.5°C | 37 | 9.7 | 9.910 h |
| March | 6.9°C-0.9°C | -0.9°C | 42 | 10.2 | 11.812 h |
| April | 13.5°C3.9°C | 3.9°C | 46 | 9.8 | 13.914 h |
| May | 18.7°C9.2°C | 9.2°C | 67 | 12.0 | 15.716 h |
| June | 21.9°C12.8°C | 12.8°C | 68 | 11.7 | 16.717 h |
| July | 23.9°C15.0°C | 15.0°C | 84 | 12.6 | 16.316 h |
| August | 23.5°C14.7°C | 14.7°C | 65 | 10.3 | 14.715 h |
| September, selected | 18.2°C10.6°C | 10.6°C | 57 | 9.8 | 12.713 h |
| October | 12.2°C6.0°C | 6.0°C | 45 | 9.4 | 10.711 h |
| November | 6.3°C1.8°C | 1.8°C | 40 | 9.2 | 8.89 h |
| December | 2.0°C-2.1°C | -2.1°C | 42 | 9.9 | 7.88 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Praga Południe in SeptemberPoland · 5 kmHigh 18.4°C · Low 10.7°C · 57 mm rain
- Bielany in SeptemberPoland · 9 kmHigh 18.2°C · Low 10.7°C · 57 mm rain
- Białołeka in SeptemberPoland · 11 kmHigh 18.4°C · Low 10.6°C · 57 mm rain
- Wawer in SeptemberPoland · 12 kmHigh 18.3°C · Low 10.7°C · 58 mm rain
- Siedlce in SeptemberPoland · 87 kmHigh 17.7°C · Low 10.6°C · 57 mm rain
- Radom in SeptemberPoland · 92 kmHigh 18.3°C · Low 10.3°C · 59 mm rain
- Płock in SeptemberPoland · 95 kmHigh 18.3°C · Low 10.6°C · 51 mm rain
- Łódź in SeptemberPoland · 117 kmHigh 18.1°C · Low 10.2°C · 58 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Warsaw) is explained once on the Warsaw year overview and on the Sources, method and limits page.
Praga Południe, Bielany and Białołeka lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.