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Bellingham wa weather september
Humidity In September, the average relative humidity in Bellingham is 79%. Rainfall In . In September, in Bellingham, Washington, the average low-temperature is °F (°C). Weather reports from September in Bellingham, Washington, USA with highs and lows. September Weather in Bellingham Washington, United States Daily high temperatures decrease by 7°F, from 71°F to 63°F, rarely falling below 57°F or exceeding . Get the monthly weather forecast for Bellingham, WA, including daily high/low, historical averages, to help you plan ahead. Get the monthly weather forecast for Bellingham, WA, including daily high/low, historical averages, to help you plan ahead. The weather in Bellingham in September is mildly cool humid but cool, with average highs of 70°F (21°C) and lows of 52°F (11°C). Tuesday, September 13, Hour-by-Hour Forecast for Bellingham, Washington, USA (Weather station: Bellingham International Airport, USA).