Photo: Robert Garry · CC BY-SA 4.0Few Canadian towns have cooler summers than Sept-Îles
The coldest hours of a January night bottom out at −20.1°C on average. Some 40°C separates winter nights from summer afternoons. Frosty nights outnumber those of 95% of Canadian towns. Expect about 205 frosty starts a year, days when the air falls to freezing.
Environment and Climate Change Canada’s 1991–2020 normals, measured at Sept-Îles, 7.8 km east.
A year in Sept-Îles at a glance
Each month’s typical high and low, in °C.
What stands out about Sept-Îles’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Sept-Îles feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
205 frost days and 37 days above 20°C a year
From September to June frost is routine, and in January it comes on almost every night. On about 45 nights a year the air falls below −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 1,077 mm of rain and snow a year
The most falls in October, the least in February. About 126 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Heating a home in Sept-Îles
83% of a year’s heating need falls between October and April. Months averaging under 10°C: September to May.
Think of it as a year’s worth of daily shortfalls below 18°C, added up. In heating terms, homes need more heating than almost every Canadian town.
Living with Sept-Îles’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jul and Aug.
Parks & trails →Frostbite weather, a wind chill under −20, turns up on about 76 days a year.
On some 1 days a year the humidex climbs past 30.
A normal year has no blizzard, flood or heat wave in it; Sept-Îles’s hazards page looks at those.
Flood & hazards →ECCC’s normals location: Sept-Îles
Behind the 1991–2020 normals for Sept-Îles are 4 stations, which ECCC combines into one record.
| Distance from the town | 7.8 km east |
| Station altitude | 55 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | No location within 100 km |
| Coldest reading, 1991–2020 | −39.9°C |
| Hottest reading, 1991–2020 | 36.6°C |
| Average wind | 13.0 km/h on average, most often from the east |
| Next-nearest location | Cap-Chat, 129 km |
How Sept-Îles compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Quebec.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Sept-Îles’s own would show the same figures). No closer places have figures: these lie 122–143 km from Sept-Îles.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Sept-Îles | 19.7°C | −20.1°C | 1,077 mm |
| Sainte-Anne-des-Monts 122 km · Cap-Chat | 19.7°C about the same | −13.9°C 6.2°C milder | 1,077 mm |
| Saint-Maxime-du-Mont-Louis 127 km · Cap-Madeleine | 20.3°C 0.6°C warmer | −13.4°C 6.7°C milder | 1,161 mm |
Sept-Îles weather by month
Each month’s normals, 1991–2020: high, low, mean and precipitation.
| Month | High | Low | Mean | Rain & snow |
|---|---|---|---|---|
| January | −8.9°C | −20.1°C | −14.5°C | 77 mm |
| February | −7.4°C | −19.4°C | −13.4°C | 60 mm |
| March | −1.9°C | −12.7°C | −7.3°C | 74 mm |
| April | 4.1°C | −4.4°C | −0.1°C | 76 mm |
| May | 10.9°C | 1.1°C | 6.0°C | 86 mm |
| June | 16.7°C | 6.5°C | 11.6°C | 87 mm |
| July | 19.7°C | 10.3°C | 15.1°C | 103 mm |
| August | 19.5°C | 9.6°C | 14.6°C | 86 mm |
| September | 14.8°C | 4.8°C | 9.8°C | 107 mm |
| October | 8.4°C | 0.1°C | 4.3°C | 118 mm |
| November | 1.7°C | −6.3°C | −2.3°C | 112 mm |
| December | −4.9°C | −14.3°C | −9.6°C | 92 mm |
| Year | 6.1°C | −3.7°C | 1.2°C | 1,077 mm |
The most changeable month: February, give or take 3.1°C; the steadiest, July
Records from 1991 to 2020: no month spans more than March, between −32.8°C (2014) and 16.4°C (2012).
Where Sept-Îles’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Sept-Îles, 1991–2020, chosen as the nearest location with a full temperature record.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- Not on this page: snowfall (no location within 100 km publishes a full year of it), sunshine (none for 1991–2020) and an altitude correction.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Sept-Îles’s climate
How warm does Sept-Îles get in summer?
Midsummer means July, with afternoons near 19.7°C on a typical day.
How cold does Sept-Îles get in winter?
A typical January night falls to −20.1°C, the year’s low point.
How much rain and snow does Sept-Îles get?
About 1,077 mm a year, rain and melted snow together. October is the wettest month (118 mm) and February the driest (60 mm).
Are these figures for Sept-Îles itself?
They are: the normals station that gives them stands in Sept-Îles.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Sept-Îles →
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).