
Average low temperature in September: 47.3☏ The month with the highest average low temperature is August (50.2☏). The month with the lowest average high temperature is December (40.8☏). Whatcom News readers are encouraged to stay up t o date with the current weather forecast for their specific locations via the Whatcom News Weather page. Maple Valley, WA Average high temperature in September: 68.4☏ The warmest month (with the highest average high temperature) is August (75.4☏). The following are the currently expected high temperatures across Whatcom County (based on meteoblue‘s high-resolution ensemble of multiple global and local forecast models combined with artificial intelligence).

An increase in onshore flow may cool coastal areas Monday while interior temperatures are expected to remain warm. Tomorrow, in Maple Valley, brief periods of light rainfall are also anticipated in the afternoon. 30 percent chance of showers early this evening with risk of thunderstorms. National Weather Service (NWS) forecasters are calling for summer-like high temperatures this weekend.Īccording to NWS forecasters today, May 9th, high temperatures are expected to climb into the 80s at western Washington coastal locations and into much of the interior.
