| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 8.4° | 3° | 152.3mm | 19.2 | 33 |
| February | 9.4° | 2.8° | 98.7mm | 16.2 | 36 |
| March | 11.6° | 4.1° | 102.9mm | 17.4 | 43 |
| April | 14.5° | 5.9° | 73.3mm | 14.7 | 53 |
| May | 18.4° | 8.9° | 49.1mm | 11.3 | 72 |
| June | 21.3° | 11.5° | 37.3mm | 9.4 | 81 |
| July | 25.1° | 13.7° | 13.2mm | 4 | 92 |
| August | 25° | 13.9° | 23.7mm | 5.1 | 90 |
| September | 21.5° | 11.9° | 44.2mm | 8.8 | 82 |
| October | 15.4° | 8.1° | 104mm | 14.8 | 56 |
| November | 10.7° | 4.7° | 166.7mm | 18.5 | 40 |
| December | 7.8° | 2.6° | 149.9mm | 18.7 | 31 |
January in Burien averages a daily high of 8.4°C with nights around 3°C. Expect roughly 19.2 wet days totalling 152.3mm. A hard month to visit for comfort alone.
February in Burien averages a daily high of 9.4°C with nights around 2.8°C. Expect roughly 16.2 wet days totalling 98.7mm. Demanding conditions — pack for it and plan indoor options.
March in Burien averages a daily high of 11.6°C with nights around 4.1°C. Expect roughly 17.4 wet days totalling 102.9mm. Demanding conditions — pack for it and plan indoor options.
April in Burien averages a daily high of 14.5°C with nights around 5.9°C. Expect roughly 14.7 wet days totalling 73.3mm. Demanding conditions — pack for it and plan indoor options.
May in Burien averages a daily high of 18.4°C with nights around 8.9°C. Expect roughly 11.3 wet days totalling 49.1mm. Generally workable, with some weather to plan around.
June in Burien averages a daily high of 21.3°C with nights around 11.5°C. Expect roughly 9.4 wet days totalling 37.3mm. Comfortable conditions for being outdoors all day.
July in Burien averages a daily high of 25.1°C with nights around 13.7°C. Expect roughly 4 wet days totalling 13.2mm. Comfortable conditions for being outdoors all day.
August in Burien averages a daily high of 25°C with nights around 13.9°C. Expect roughly 5.1 wet days totalling 23.7mm. Comfortable conditions for being outdoors all day.
September in Burien averages a daily high of 21.5°C with nights around 11.9°C. Expect roughly 8.8 wet days totalling 44.2mm. Comfortable conditions for being outdoors all day.
October in Burien averages a daily high of 15.4°C with nights around 8.1°C. Expect roughly 14.8 wet days totalling 104mm. Generally workable, with some weather to plan around.
November in Burien averages a daily high of 10.7°C with nights around 4.7°C. Expect roughly 18.5 wet days totalling 166.7mm. Demanding conditions — pack for it and plan indoor options.
December in Burien averages a daily high of 7.8°C with nights around 2.6°C. Expect roughly 18.7 wet days totalling 149.9mm. 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. Burien peaks at 92.
Based on 30 years of records, July–August scores highest for comfort in Burien, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 25.1°C.
November is the wettest, averaging 166.7mm of rain across roughly 18.5 wet days.
December is the coolest month, with average daily highs around 7.8°C.