The climate in Castellammare del Golfo during September can be summarized as hot, humid and reasonably dry.
September is in the fall / autumn in Castellammare del Golfo and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 20°C (68°F) is normal.
| Daytime temperature | 26.3°C 79.3°F | 
|---|---|
| Nightly temperature | 19.7°C 67.5°F | 
| Average temperature | 23°C 73.4°F | 
| Daily sunshine | 9 hrs | 
| Avg rainfall | 41 mm 1.6 ins | 
| Rainy days | 5 days | 
| Sea temperature | 24.9°C 76.8°F | 
| Humidity | 73% | 
| Windspeed | 11.5kph 7 mph | 
On average September is the 5th driest month of the year in Castellammare del Golfo with around 41mm 1.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 9 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 Castellammare del Golfo in September 2025.
Best places to visit in September
| Hottest month: | August | 28.6°C 83.5°F | 
|---|---|---|
| Driest month: | July | 5mm 0.2ins | 
| Sunniest month: | July | 11.8hrs | 
| Coldest month: | January | 13.7°C 56.7°F | 
| Wettest month: | November | 85mm 3.3ins | 
 
	 
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