Climate averages 1991–2020
Bytom weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Bytom: daytime highs average 18.3°C and nights cool to about 10.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 71 mm of rain on roughly 11 days, which makes September a moderately wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 41 min on an average September day.
The nearest other city in this atlas is Zabrze (11 km away). In September its highs average 18.6°C, about as warm as Bytom, with 72 mm of rain.
Among the 60 cities listed in Poland, Bytom ranks joint 32nd of 60 for the warmest September highs and joint 45th of 60 for the driest September (rainfall, lowest first). The mean September high of those 60 cities is 18.3°C; Bytom is level with that mean.
From September to October, average highs fall by 5.4°C to 12.9°C, and monthly rainfall falls from 71 mm to 54 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
Bytom climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 0.7°C-4.6°C | -4.6°C | 46 | 11.4 | 8.69 h |
| February | 2.6°C-3.9°C | -3.9°C | 43 | 10.4 | 10.010 h |
| March | 7.4°C-0.8°C | -0.8°C | 52 | 11.8 | 11.812 h |
| April | 13.7°C3.8°C | 3.8°C | 50 | 10.1 | 13.814 h |
| May | 18.1°C8.9°C | 8.9°C | 80 | 13.9 | 15.415 h |
| June | 21.3°C12.6°C | 12.6°C | 82 | 13.2 | 16.316 h |
| July | 23.3°C14.6°C | 14.6°C | 98 | 14.0 | 16.016 h |
| August | 23.3°C14.4°C | 14.4°C | 71 | 11.3 | 14.515 h |
| September, selected | 18.3°C10.4°C | 10.4°C | 71 | 11.1 | 12.713 h |
| October | 12.9°C6.1°C | 6.1°C | 54 | 10.0 | 10.811 h |
| November | 7.2°C1.7°C | 1.7°C | 50 | 10.1 | 9.19 h |
| December | 2.1°C-2.7°C | -2.7°C | 45 | 10.7 | 8.18 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
- Zabrze in SeptemberPoland · 11 kmHigh 18.6°C · Low 10.6°C · 72 mm rain
- Katowice in SeptemberPoland · 12 kmHigh 18.4°C · Low 10.4°C · 71 mm rain
- Sosnowiec in SeptemberPoland · 14 kmHigh 18.5°C · Low 10.6°C · 71 mm rain
- Gliwice in SeptemberPoland · 19 kmHigh 18.9°C · Low 10.9°C · 72 mm rain
- Dąbrowa Górnicza in SeptemberPoland · 19 kmHigh 18.4°C · Low 10.5°C · 70 mm rain
- Mysłowice in SeptemberPoland · 23 kmHigh 18.5°C · Low 10.4°C · 70 mm rain
- Tychy in SeptemberPoland · 24 kmHigh 18.3°C · Low 10.2°C · 71 mm rain
- Jaworzno in SeptemberPoland · 29 kmHigh 18.1°C · Low 10.0°C · 70 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 Bytom) is explained once on the Bytom year overview and on the Sources, method and limits page.
Katowice, Sosnowiec and Tychy lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.