| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3° | -3° | 48.6mm | 14.3 | 9 |
| February | 5.4° | -3° | 32mm | 11.3 | 23 |
| March | 10.6° | -0.3° | 42.9mm | 12.2 | 42 |
| April | 15° | 2.4° | 30.6mm | 10.7 | 63 |
| May | 20.7° | 6.7° | 41.8mm | 10 | 80 |
| June | 24.6° | 10.5° | 39.3mm | 8.8 | 82 |
| July | 31° | 13.7° | 9.3mm | 2.8 | 78 |
| August | 30.2° | 13.1° | 11.2mm | 3.3 | 81 |
| September | 24.2° | 8.5° | 17.1mm | 5.3 | 89 |
| October | 15.7° | 3.4° | 33.6mm | 9.7 | 67 |
| November | 7.3° | -0.5° | 51.3mm | 13.4 | 29 |
| December | 2.6° | -3.2° | 58.1mm | 14.5 | 8 |
January in Spokane Valley averages a daily high of 3°C with nights around -3°C. Expect roughly 14.3 wet days totalling 48.6mm. A hard month to visit for comfort alone.
February in Spokane Valley averages a daily high of 5.4°C with nights around -3°C. Expect roughly 11.3 wet days totalling 32mm. A hard month to visit for comfort alone.
March in Spokane Valley averages a daily high of 10.6°C with nights around -0.3°C. Expect roughly 12.2 wet days totalling 42.9mm. Demanding conditions — pack for it and plan indoor options.
April in Spokane Valley averages a daily high of 15°C with nights around 2.4°C. Expect roughly 10.7 wet days totalling 30.6mm. Generally workable, with some weather to plan around.
May in Spokane Valley averages a daily high of 20.7°C with nights around 6.7°C. Expect roughly 10 wet days totalling 41.8mm. Comfortable conditions for being outdoors all day.
June in Spokane Valley averages a daily high of 24.6°C with nights around 10.5°C. Expect roughly 8.8 wet days totalling 39.3mm. Comfortable conditions for being outdoors all day.
July in Spokane Valley averages a daily high of 31°C with nights around 13.7°C. Rain is rare — about 2.8 wet days and 9.3mm across the month. Comfortable conditions for being outdoors all day.
August in Spokane Valley averages a daily high of 30.2°C with nights around 13.1°C. Expect roughly 3.3 wet days totalling 11.2mm. Comfortable conditions for being outdoors all day.
September in Spokane Valley averages a daily high of 24.2°C with nights around 8.5°C. Expect roughly 5.3 wet days totalling 17.1mm. Comfortable conditions for being outdoors all day.
October in Spokane Valley averages a daily high of 15.7°C with nights around 3.4°C. Expect roughly 9.7 wet days totalling 33.6mm. Generally workable, with some weather to plan around.
November in Spokane Valley averages a daily high of 7.3°C with nights around -0.5°C. Expect roughly 13.4 wet days totalling 51.3mm. A hard month to visit for comfort alone.
December in Spokane Valley averages a daily high of 2.6°C with nights around -3.2°C. Expect roughly 14.5 wet days totalling 58.1mm. 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. Spokane Valley peaks at 89.
Based on 30 years of records, August–September scores highest for comfort in Spokane Valley, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 31°C.
December is the wettest, averaging 58.1mm of rain across roughly 14.5 wet days.
December is the coolest month, with average daily highs around 2.6°C.