weather on the isle of man
Douglas, Isle Of Man Climate & Temperature. 1  Douglas, Isle Of Man, Uk is at 5410'N, 428'W, 87 m (285 ft). 2  Douglas, Isle Of Man has a marine west coast climate that is mild with no dry season, warm summers. 3  The mean temperature is 9.5 degrees Celsius (49.1 degrees Fahrenheit).  Average monthly temperatures vary by 10.5 Â°C (18.9Â°F).