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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 21°C, while the coldest is January averaging around 4°C at night. Precipitation totals about 437 mm a year and is strongly seasonal — November alone averages 74 mm while July barely receives 11 mm.
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 (°C) | 7 | 8 | 9 | 12 | 15 | 18 | 21 | 21 | 18 | 13 | 9 | 7 |
| Avg temp (°C) | 6 | 6 | 7 | 10 | 13 | 16 | 18 | 18 | 16 | 11 | 8 | 6 |
| Avg low (°C) | 4 | 4 | 5 | 8 | 11 | 13 | 15 | 15 | 14 | 10 | 6 | 4 |
| Precipitation (mm) | 54 | 36 | 42 | 25 | 18 | 18 | 11 | 13 | 29 | 48 | 74 | 68 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 8 | 9 | 12 | 15 | 18 |
| Avg temp (°C) | 6 | 6 | 7 | 10 | 13 | 16 |
| Avg low (°C) | 4 | 4 | 5 | 8 | 11 | 13 |
| Precipitation (mm) | 54 | 36 | 42 | 25 | 18 | 18 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 21 | 18 | 13 | 9 | 7 |
| Avg temp (°C) | 18 | 18 | 16 | 11 | 8 | 6 |
| Avg low (°C) | 15 | 15 | 14 | 10 | 6 | 4 |
| Precipitation (mm) | 11 | 13 | 29 | 48 | 74 | 68 |
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.