Overview: Bellingham, WABellingham, WA (United States of America) is a place with a mild climate. Temperatures during the day are in the range from 7 °C (45 °F) in December to 24 °C (75 °F) in August. The highest night temperatures could be experienced in July with 13 °C (55 °F), the lowest in December with 1 °C (34 °F). The least rainy month in Bellingham, WA is July with its 7 days of rain, the rainiest month is November, when it rains 20 days.