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Nanaimo, British Columbia climate
Csb Warm-summer Mediterranean
Nanaimo has a mildly seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 69°F, while the coldest is January averaging around 39°F at night. Precipitation totals about 17 inches a year and is strongly seasonal — November alone averages 2.9 inches while July barely receives 0.42 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Nanaimo climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 45 | 46 | 49 | 53 | 60 | 65 | 70 | 69 | 64 | 55 | 49 | 45 |
| Avg temp (°F) | 42 | 42 | 45 | 50 | 56 | 60 | 65 | 65 | 60 | 52 | 46 | 43 |
| Avg low (°F) | 39 | 39 | 42 | 46 | 51 | 56 | 60 | 60 | 57 | 49 | 43 | 40 |
| Precipitation (in) | 2.1 | 1.4 | 1.7 | 1.0 | 0.7 | 0.7 | 0.4 | 0.5 | 1.1 | 1.9 | 2.9 | 2.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 45 | 46 | 49 | 53 | 60 | 65 |
| Avg temp (°F) | 42 | 42 | 45 | 50 | 56 | 60 |
| Avg low (°F) | 39 | 39 | 42 | 46 | 51 | 56 |
| Precipitation (in) | 2.1 | 1.4 | 1.7 | 1.0 | 0.7 | 0.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 70 | 69 | 64 | 55 | 49 | 45 |
| Avg temp (°F) | 65 | 65 | 60 | 52 | 46 | 43 |
| Avg low (°F) | 60 | 60 | 57 | 49 | 43 | 40 |
| Precipitation (in) | 0.4 | 0.5 | 1.1 | 1.9 | 2.9 | 2.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 73 | 77 | 75 | 70 | 70 | 52 | 51 | 55 | 71 | 77 | 77 |
| Relative humidity (%) | 90 | 85 | 83 | 79 | 76 | 75 | 72 | 72 | 76 | 83 | 88 | 90 |
| Wind speed (mph) | 3.8 | 3.7 | 3.7 | 3.4 | 2.9 | 3.0 | 2.7 | 2.7 | 2.8 | 3.4 | 3.9 | 4.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 73 | 77 | 75 | 70 | 70 |
| Relative humidity (%) | 90 | 85 | 83 | 79 | 76 | 75 |
| Wind speed (mph) | 3.8 | 3.7 | 3.7 | 3.4 | 2.9 | 3.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 52 | 51 | 55 | 71 | 77 | 77 |
| Relative humidity (%) | 72 | 72 | 76 | 83 | 88 | 90 |
| Wind speed (mph) | 2.7 | 2.7 | 2.8 | 3.4 | 3.9 | 4.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Entrance Island, a weather station, about 11 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.