| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 8.3° | 1.9° | 119.1mm | 20.4 | 32 |
| February | 9.2° | 1.7° | 79.9mm | 16.4 | 35 |
| March | 11.6° | 3.4° | 89.3mm | 18.3 | 43 |
| April | 14.6° | 5.1° | 66.1mm | 14.9 | 53 |
| May | 18° | 8° | 61.3mm | 11.3 | 71 |
| June | 20.5° | 10.5° | 42.1mm | 10.1 | 80 |
| July | 23.6° | 12.3° | 22.1mm | 5.1 | 90 |
| August | 23.5° | 12.4° | 25.2mm | 5.6 | 89 |
| September | 20° | 10.3° | 53.3mm | 9.3 | 81 |
| October | 15° | 7.2° | 110mm | 16.3 | 54 |
| November | 10.7° | 3.9° | 153mm | 19.8 | 40 |
| December | 7.4° | 1.4° | 121.5mm | 20.7 | 29 |
January in Bellingham averages a daily high of 8.3°C with nights around 1.9°C. Expect roughly 20.4 wet days totalling 119.1mm. A hard month to visit for comfort alone.
February in Bellingham averages a daily high of 9.2°C with nights around 1.7°C. Expect roughly 16.4 wet days totalling 79.9mm. Demanding conditions — pack for it and plan indoor options.
March in Bellingham averages a daily high of 11.6°C with nights around 3.4°C. Expect roughly 18.3 wet days totalling 89.3mm. Demanding conditions — pack for it and plan indoor options.
April in Bellingham averages a daily high of 14.6°C with nights around 5.1°C. Expect roughly 14.9 wet days totalling 66.1mm. Demanding conditions — pack for it and plan indoor options.
May in Bellingham averages a daily high of 18°C with nights around 8°C. Expect roughly 11.3 wet days totalling 61.3mm. Generally workable, with some weather to plan around.
June in Bellingham averages a daily high of 20.5°C with nights around 10.5°C. Expect roughly 10.1 wet days totalling 42.1mm. Comfortable conditions for being outdoors all day.
July in Bellingham averages a daily high of 23.6°C with nights around 12.3°C. Expect roughly 5.1 wet days totalling 22.1mm. Comfortable conditions for being outdoors all day.
August in Bellingham averages a daily high of 23.5°C with nights around 12.4°C. Expect roughly 5.6 wet days totalling 25.2mm. Comfortable conditions for being outdoors all day.
September in Bellingham averages a daily high of 20°C with nights around 10.3°C. Expect roughly 9.3 wet days totalling 53.3mm. Comfortable conditions for being outdoors all day.
October in Bellingham averages a daily high of 15°C with nights around 7.2°C. Expect roughly 16.3 wet days totalling 110mm. Demanding conditions — pack for it and plan indoor options.
November in Bellingham averages a daily high of 10.7°C with nights around 3.9°C. Expect roughly 19.8 wet days totalling 153mm. Demanding conditions — pack for it and plan indoor options.
December in Bellingham averages a daily high of 7.4°C with nights around 1.4°C. Expect roughly 20.7 wet days totalling 121.5mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Bellingham peaks at 90.
Based on 30 years of records, July–August scores highest for comfort in Bellingham, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.6°C.
November is the wettest, averaging 153mm of rain across roughly 19.8 wet days.
December is the coolest month, with average daily highs around 7.4°C.