Click on a day for an hourly weather forecast
The temperatures in Nanaimo in September are usually low and can range between 11°C and 17°C.
You can expect rain for roughly half of the month of September in Nanaimo. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Nanaimo in September 2025.
If you’re planning to visit Nanaimo in the near future, we highly recommend that you review the 14 day weather forecast for Nanaimo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / 1° | 14 | 14 | 3 | 376 mm | Awful | Nanaimo in January |
| February | 5° / 1° | 11 | 13 | 5 | 250 mm | Awful | Nanaimo in February |
| March | 6° / 2° | 15 | 14 | 3 | 289 mm | Awful | Nanaimo in March |
| April | 9° / 4° | 11 | 18 | 1 | 186 mm | Bad | Nanaimo in April |
| May | 13° / 8° | 7 | 24 | 0 | 125 mm | Bad | Nanaimo in May |
| June | 16° / 10° | 6 | 24 | 0 | 104 mm | Good | Nanaimo in June |
| July | 19° / 13° | 4 | 27 | 0 | 52 mm | Good | Nanaimo in July |
| August | 20° / 13° | 3 | 28 | 0 | 72 mm | Good | Nanaimo in August |
| September | 17° / 11° | 8 | 22 | 0 | 174 mm | Ok | Nanaimo in September |
| October | 12° / 7° | 11 | 20 | 0 | 281 mm | Bad | Nanaimo in October |
| November | 7° / 4° | 15 | 14 | 1 | 402 mm | Bad | Nanaimo in November |
| December | 4° / 1° | 14 | 13 | 4 | 330 mm | Awful | Nanaimo in December |