Planning for the weather is an important factor for making your trip to Snoqualmie a success, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 16°C, while the coldest months are December and February, with an average of 3°C. The rainiest months in Snoqualmie are November, January, December and October, with each month seeing an average of 252 mm of rainfall.