You might spend a lot of your holiday inside, but if you want to see more of the area, looking at local weather trends is a good idea. The hottest months are usually August and July, with an average temperature of 17°C, while the coldest months are February and December, with an average of 4°C. The rainiest months in Shelton are November, December, January and March, with each month seeing an average of 233 mm of rainfall.