The climate in Petroşani during September can be summarized as mild and reasonably dry.
September is in the fall / autumn in Petroşani and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 18°C (65°F), whilst at night 8°C (46°F) is normal.
| Daytime temperature | 18.4°C 65°F | 
|---|---|
| Nightly temperature | 7.9°C 46.1°F | 
| Average temperature | 13.1°C 55.6°F | 
| Daily sunshine | 6.8 hrs | 
| Avg rainfall | 58 mm 2.3 ins | 
| Rainy days | 9 days | 
| Sea temperature | 21.6°C 70.8°F | 
| Humidity | 79% | 
| Windspeed | 11.2kph 7 mph | 
On average September is the 6th wettest month of the year in Petroşani with around 58mm 2.3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.8 hours of sunshine per day.
				
						
						The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Petroşani in September 2025.
Best places to visit in September
| Hottest month: | July | 21.1°C 70°F | 
|---|---|---|
| Driest month: | March | 45mm 1.8ins | 
| Sunniest month: | August | 8.3hrs | 
| Coldest month: | January | -0°C 32°F | 
| Wettest month: | June | 122mm 4.8ins |