| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.1° | 1.8° | 302.9mm | 19.2 | 25 |
| February | 7.2° | 1.4° | 143.5mm | 13.7 | 31 |
| March | 9.6° | 2.8° | 201.2mm | 17.3 | 37 |
| April | 13° | 5.1° | 123.2mm | 14 | 50 |
| May | 17.5° | 8.6° | 89.2mm | 10.6 | 71 |
| June | 20.3° | 11.3° | 63.3mm | 9.3 | 81 |
| July | 23.7° | 13.5° | 41.6mm | 4.4 | 91 |
| August | 23.5° | 13.8° | 58.4mm | 6.1 | 88 |
| September | 19.2° | 11.2° | 103.5mm | 9.5 | 78 |
| October | 13.5° | 7.4° | 222.8mm | 15.7 | 49 |
| November | 8.4° | 3.7° | 318.9mm | 18.1 | 33 |
| December | 5.2° | 0.9° | 260.2mm | 18.8 | 21 |
January in Coquitlam averages a daily high of 6.1°C with nights around 1.8°C. Expect roughly 19.2 wet days totalling 302.9mm. A hard month to visit for comfort alone.
February in Coquitlam averages a daily high of 7.2°C with nights around 1.4°C. Expect roughly 13.7 wet days totalling 143.5mm. A hard month to visit for comfort alone.
March in Coquitlam averages a daily high of 9.6°C with nights around 2.8°C. Expect roughly 17.3 wet days totalling 201.2mm. Demanding conditions — pack for it and plan indoor options.
April in Coquitlam averages a daily high of 13°C with nights around 5.1°C. Expect roughly 14 wet days totalling 123.2mm. Demanding conditions — pack for it and plan indoor options.
May in Coquitlam averages a daily high of 17.5°C with nights around 8.6°C. Expect roughly 10.6 wet days totalling 89.2mm. Generally workable, with some weather to plan around.
June in Coquitlam averages a daily high of 20.3°C with nights around 11.3°C. Expect roughly 9.3 wet days totalling 63.3mm. Comfortable conditions for being outdoors all day.
July in Coquitlam averages a daily high of 23.7°C with nights around 13.5°C. Expect roughly 4.4 wet days totalling 41.6mm. Comfortable conditions for being outdoors all day.
August in Coquitlam averages a daily high of 23.5°C with nights around 13.8°C. Expect roughly 6.1 wet days totalling 58.4mm. Comfortable conditions for being outdoors all day.
September in Coquitlam averages a daily high of 19.2°C with nights around 11.2°C. Expect roughly 9.5 wet days totalling 103.5mm. Comfortable conditions for being outdoors all day.
October in Coquitlam averages a daily high of 13.5°C with nights around 7.4°C. Expect roughly 15.7 wet days totalling 222.8mm. Demanding conditions — pack for it and plan indoor options.
November in Coquitlam averages a daily high of 8.4°C with nights around 3.7°C. Expect roughly 18.1 wet days totalling 318.9mm. A hard month to visit for comfort alone.
December in Coquitlam averages a daily high of 5.2°C with nights around 0.9°C. Expect roughly 18.8 wet days totalling 260.2mm. 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. Coquitlam peaks at 91.
Based on 30 years of records, July–August scores highest for comfort in Coquitlam, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.7°C.
November is the wettest, averaging 318.9mm of rain across roughly 18.1 wet days.
December is the coolest month, with average daily highs around 5.2°C.