| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 8° | 0.8° | 207.1mm | 20.7 | 30 |
| February | 9.3° | 0.1° | 134.3mm | 16.7 | 33 |
| March | 11.9° | 1.3° | 142.8mm | 19.2 | 43 |
| April | 14.9° | 2.8° | 87.6mm | 16.1 | 54 |
| May | 18.9° | 6° | 57.5mm | 11.4 | 74 |
| June | 21.8° | 8.6° | 39.8mm | 8.5 | 83 |
| July | 25.8° | 10.4° | 11.9mm | 3.5 | 93 |
| August | 25.8° | 10.4° | 22.8mm | 4.7 | 91 |
| September | 22.3° | 8.1° | 55.1mm | 8.6 | 83 |
| October | 15.8° | 4.9° | 130.3mm | 15.4 | 57 |
| November | 10.5° | 2.3° | 215.8mm | 19.5 | 40 |
| December | 7.3° | 0.6° | 206.5mm | 20.4 | 27 |
January in Olympia averages a daily high of 8°C with nights around 0.8°C. Expect roughly 20.7 wet days totalling 207.1mm. A hard month to visit for comfort alone.
February in Olympia averages a daily high of 9.3°C with nights around 0.1°C. Expect roughly 16.7 wet days totalling 134.3mm. A hard month to visit for comfort alone.
March in Olympia averages a daily high of 11.9°C with nights around 1.3°C. Expect roughly 19.2 wet days totalling 142.8mm. Demanding conditions — pack for it and plan indoor options.
April in Olympia averages a daily high of 14.9°C with nights around 2.8°C. Expect roughly 16.1 wet days totalling 87.6mm. Demanding conditions — pack for it and plan indoor options.
May in Olympia averages a daily high of 18.9°C with nights around 6°C. Expect roughly 11.4 wet days totalling 57.5mm. Generally workable, with some weather to plan around.
June in Olympia averages a daily high of 21.8°C with nights around 8.6°C. Expect roughly 8.5 wet days totalling 39.8mm. Comfortable conditions for being outdoors all day.
July in Olympia averages a daily high of 25.8°C with nights around 10.4°C. Expect roughly 3.5 wet days totalling 11.9mm. Comfortable conditions for being outdoors all day.
August in Olympia averages a daily high of 25.8°C with nights around 10.4°C. Expect roughly 4.7 wet days totalling 22.8mm. Comfortable conditions for being outdoors all day.
September in Olympia averages a daily high of 22.3°C with nights around 8.1°C. Expect roughly 8.6 wet days totalling 55.1mm. Comfortable conditions for being outdoors all day.
October in Olympia averages a daily high of 15.8°C with nights around 4.9°C. Expect roughly 15.4 wet days totalling 130.3mm. Generally workable, with some weather to plan around.
November in Olympia averages a daily high of 10.5°C with nights around 2.3°C. Expect roughly 19.5 wet days totalling 215.8mm. Demanding conditions — pack for it and plan indoor options.
December in Olympia averages a daily high of 7.3°C with nights around 0.6°C. Expect roughly 20.4 wet days totalling 206.5mm. 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. Olympia peaks at 93.
Based on 30 years of records, July–August scores highest for comfort in Olympia, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 25.8°C.
November is the wettest, averaging 215.8mm of rain across roughly 19.5 wet days.
December is the coolest month, with average daily highs around 7.3°C.