| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.1° | 1.3° | 271.1mm | 19.5 | 24 |
| February | 6.7° | 1.1° | 146mm | 15.7 | 26 |
| March | 8.9° | 2.5° | 197.2mm | 20.5 | 34 |
| April | 13.3° | 4.9° | 125.8mm | 14.3 | 50 |
| May | 16.4° | 8.1° | 110.5mm | 14.6 | 59 |
| June | 19.6° | 10.9° | 74.8mm | 12.1 | 75 |
| July | 22.6° | 13.2° | 45.6mm | 6.1 | 88 |
| August | 22.2° | 13.5° | 51.8mm | 6.6 | 87 |
| September | 18.4° | 11.1° | 107.4mm | 11.4 | 72 |
| October | 12.1° | 6.8° | 208.2mm | 17.6 | 45 |
| November | 7.9° | 3.2° | 293.7mm | 20.3 | 31 |
| December | 5.5° | 0.6° | 254mm | 20.3 | 21 |
January in New Westminster averages a daily high of 6.1°C with nights around 1.3°C. Expect roughly 19.5 wet days totalling 271.1mm. A hard month to visit for comfort alone.
February in New Westminster averages a daily high of 6.7°C with nights around 1.1°C. Expect roughly 15.7 wet days totalling 146mm. A hard month to visit for comfort alone.
March in New Westminster averages a daily high of 8.9°C with nights around 2.5°C. Expect roughly 20.5 wet days totalling 197.2mm. A hard month to visit for comfort alone.
April in New Westminster averages a daily high of 13.3°C with nights around 4.9°C. Expect roughly 14.3 wet days totalling 125.8mm. Demanding conditions — pack for it and plan indoor options.
May in New Westminster averages a daily high of 16.4°C with nights around 8.1°C. Expect roughly 14.6 wet days totalling 110.5mm. Generally workable, with some weather to plan around.
June in New Westminster averages a daily high of 19.6°C with nights around 10.9°C. Expect roughly 12.1 wet days totalling 74.8mm. Comfortable conditions for being outdoors all day.
July in New Westminster averages a daily high of 22.6°C with nights around 13.2°C. Expect roughly 6.1 wet days totalling 45.6mm. Comfortable conditions for being outdoors all day.
August in New Westminster averages a daily high of 22.2°C with nights around 13.5°C. Expect roughly 6.6 wet days totalling 51.8mm. Comfortable conditions for being outdoors all day.
September in New Westminster averages a daily high of 18.4°C with nights around 11.1°C. Expect roughly 11.4 wet days totalling 107.4mm. Generally workable, with some weather to plan around.
October in New Westminster averages a daily high of 12.1°C with nights around 6.8°C. Expect roughly 17.6 wet days totalling 208.2mm. Demanding conditions — pack for it and plan indoor options.
November in New Westminster averages a daily high of 7.9°C with nights around 3.2°C. Expect roughly 20.3 wet days totalling 293.7mm. A hard month to visit for comfort alone.
December in New Westminster averages a daily high of 5.5°C with nights around 0.6°C. Expect roughly 20.3 wet days totalling 254mm. 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. New Westminster peaks at 88.
Based on 30 years of records, July–August scores highest for comfort in New Westminster, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.6°C.
November is the wettest, averaging 293.7mm of rain across roughly 20.3 wet days.
December is the coolest month, with average daily highs around 5.5°C.