| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7° | 3.6° | 140.4mm | 19.8 | 28 |
| February | 7.3° | 3.6° | 74.9mm | 15.8 | 29 |
| March | 9.1° | 4.9° | 84.6mm | 17.7 | 35 |
| April | 11.7° | 6.9° | 50.8mm | 14 | 45 |
| May | 15.4° | 10.2° | 43.5mm | 11.2 | 63 |
| June | 18.2° | 12.9° | 37.9mm | 9.8 | 75 |
| July | 20.9° | 15.6° | 20mm | 5.5 | 89 |
| August | 21° | 16° | 19.5mm | 5.4 | 89 |
| September | 17.4° | 13.2° | 51.3mm | 9.7 | 72 |
| October | 12.7° | 9.3° | 98.6mm | 16 | 47 |
| November | 9.2° | 5.8° | 139.1mm | 19.6 | 35 |
| December | 7.1° | 3.7° | 159.4mm | 20.5 | 29 |
January in Nanaimo averages a daily high of 7°C with nights around 3.6°C. Expect roughly 19.8 wet days totalling 140.4mm. A hard month to visit for comfort alone.
February in Nanaimo averages a daily high of 7.3°C with nights around 3.6°C. Expect roughly 15.8 wet days totalling 74.9mm. A hard month to visit for comfort alone.
March in Nanaimo averages a daily high of 9.1°C with nights around 4.9°C. Expect roughly 17.7 wet days totalling 84.6mm. Demanding conditions — pack for it and plan indoor options.
April in Nanaimo averages a daily high of 11.7°C with nights around 6.9°C. Expect roughly 14 wet days totalling 50.8mm. Demanding conditions — pack for it and plan indoor options.
May in Nanaimo averages a daily high of 15.4°C with nights around 10.2°C. Expect roughly 11.2 wet days totalling 43.5mm. Generally workable, with some weather to plan around.
June in Nanaimo averages a daily high of 18.2°C with nights around 12.9°C. Expect roughly 9.8 wet days totalling 37.9mm. Comfortable conditions for being outdoors all day.
July in Nanaimo averages a daily high of 20.9°C with nights around 15.6°C. Expect roughly 5.5 wet days totalling 20mm. Comfortable conditions for being outdoors all day.
August in Nanaimo averages a daily high of 21°C with nights around 16°C. Expect roughly 5.4 wet days totalling 19.5mm. Comfortable conditions for being outdoors all day.
September in Nanaimo averages a daily high of 17.4°C with nights around 13.2°C. Expect roughly 9.7 wet days totalling 51.3mm. Generally workable, with some weather to plan around.
October in Nanaimo averages a daily high of 12.7°C with nights around 9.3°C. Expect roughly 16 wet days totalling 98.6mm. Demanding conditions — pack for it and plan indoor options.
November in Nanaimo averages a daily high of 9.2°C with nights around 5.8°C. Expect roughly 19.6 wet days totalling 139.1mm. Demanding conditions — pack for it and plan indoor options.
December in Nanaimo averages a daily high of 7.1°C with nights around 3.7°C. Expect roughly 20.5 wet days totalling 159.4mm. 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. Nanaimo peaks at 89.
Based on 30 years of records, July–August scores highest for comfort in Nanaimo, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 21°C.
December is the wettest, averaging 159.4mm of rain across roughly 20.5 wet days.
January is the coolest month, with average daily highs around 7°C.