You might spend a lot of your holiday inside, but if you're planning to venture beyond the casino, taking a look at local weather data can help you. 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 5°C. The rainiest months in Poulsbo are November, December, January and October, with each month seeing an average of 185 mm of rainfall.