Sept-Îles weather in September

In September, Sept-Îles sees average daytime highs of 15°C and overnight lows near 7°C, with 103 mm of precipitation across 12.2 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 13°C by the end. The sky is clear or mostly clear about 22% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Sept-Îles's 5th-clearest and 8th-windiest month. For the whole year in context, see Sept-Îles's year-round climate.

Daytime high
15°
4th warmest
Overnight low
9th coldest
Precipitation
103 mm
12.2 wet days
Daylight
12 h 24 min
5:09 AM – 5:31 PM
Cloud cover
65%
5th clearest
Wind
12 km/h
8th windiest
Solar energy
3.36 kWh/m²
Travel score
4.3
out of 10

Sept-Îles is city in Quebec, Canada.

Density
13/km²
people per km²
Founded
2003

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 18°C in the first days to 13°C by the end.

A typical September day in Sept-Îles reaches about 15°C in the afternoon and slips back to 7°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 20°C. Set against its neighbours, September runs about 5°C cooler than August and about 7°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1189
2189
3189
4179
5179
6179
7178
8178
9168
10168
11168
12168
13167
14157
15157
16157
17157
18156
19146
20146
21146
22146
23146
24135
25135
26135
27135
28135
29125
30124

How September really feels in Sept-Îles

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Sept-Îles weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-10° / -19°6910.411.18.30.0
Feb-8° / -18°548.79.39.70.0
Mar-2° / -11°7510.310.211.50.0
Apr / -4°8210.67.813.50.2
May12° / 8511.41.915.22.8
Jun18° / 8111.6016.15.4
Jul21° / 12°10213.5015.75.8
Aug20° / 11°9312.4014.35.9
Sep15° / 10312.20.112.44.3
Oct / 11312.42.810.51.3
Nov / -6°10312.28.68.80.0
Dec-6° / -14°9511.6127.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33862
43862
53862
63862
73862
83862
93862
103961
113961
123961
133961
143961
153961
163961
174060
184159
194159
204159
214159
224159
234159
244159
254357
264258
274159
284159
294159
304159

Chance of precipitation in September

Any precipitation

Sept-Îles gets around 103 mm of rain and snow over 12.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 41% and peaks near 42% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
240
340
441
541
641
741
841
941
1041
1142
1242
1342
1442
1542
1642
1742
1841
1941
2041
2141
2241
2341
2441
2541
2640
2740
2839
2939
3039

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
186122
287112
388102
489101
59091
69181
79181
89271
99361
109361
119451
129451
139541
149541
159640
169730
179730
189730
199730
209820
219820
229820
239820
249820
259910
269910
279910
289910
299910
309910

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 18 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over September. Sunrise moves from 4:45 AM to 5:31 AM, and sunset from 6:05 PM to 4:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.34:456:05
213.34:476:03
313.24:496:01
413.14:505:58
513.14:525:56
613.04:535:54
712.94:555:52
812.94:565:49
912.84:585:47
1012.84:595:45
1112.75:015:42
1212.65:025:40
1312.65:045:38
1412.55:065:36
1512.45:075:33
1612.45:095:31
1712.35:105:29
1812.25:125:26
1912.25:135:24
2012.15:155:22
2112.05:175:19
2212.05:185:17
2311.95:205:15
2411.95:215:13
2511.85:235:10
2611.75:245:08
2711.75:265:06
2811.65:285:03
2911.55:295:01
3011.55:314:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.36 kWh/m².

For context, solar energy here swings from a low near 0.98 kWh/m² to a high of 5.75 kWh/m² in June across the year — September's 3.36 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
14.0Moderate
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.6Moderate
93.6Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.4Moderate
143.4Moderate
153.3Moderate
163.3Moderate
173.3Moderate
183.2Moderate
193.2Moderate
203.1Moderate
213.1Moderate
223.1Moderate
233.0Moderate
243.0Moderate
253.0Moderate
262.9Moderate
272.9Moderate
282.8Moderate
292.8Moderate
302.8Moderate
Planning a trip in September

Is September a good time to visit Sept-Îles?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.3
Sightseeing
4th-best month of the year
0.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sept-Îles for sightseeing.

What to pack for Sept-Îles in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Sept-Îles sees daytime highs around 15°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Sept-Îles in September

The nearest coast averages about 11°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 14°C and coldest in February near -1°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

-5°0°5°10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan0Bracing
Feb0Bracing
Mar0Bracing
Apr1Bracing
May5Bracing
Jun10Bracing
Jul14Bracing
Aug14Bracing
Sep11Bracing
Oct7Bracing
Nov4Bracing
Dec1Bracing

UV index in Sept-Îles in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sept-Îles peaks around July 9 at about 6 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateModerateLowJul 9UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May5Moderate
Jun6High
Jul6High
Aug2Low
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low

Air quality in Sept-Îles in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Sept-Îles is worst in June — around 24 µg/m³ PM2.5 (moderate), about 15.2× the cleanest month (December, 2 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1622 µg/m³Dec 142 µg/m³
PM2.5 (µg/m³)Level
Jan2Good
Feb4Good
Mar7Good
Apr7Good
May10Good
Jun24Moderate
Jul9Good
Aug9Good
Sep6Good
Oct3Good
Nov2Good
Dec2Good
Location & terrain

Where is Sept-Îles?

Sept-Îles sits at 50.2°N, 66.4°W, 5 m above sea level, in Canada. The nearest listed city is Baie-Comeau, 168 km away.

EdmundstonRivière-du-LoupMiramichiChicoutimiSaguenayJonquière

Topography around Sept-Îles

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sept-Îles.

Within 3 km, the terrain around Sept-Îles has only modest variations in elevation — a maximum elevation change of 42 m around an average of 6 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 370 m; within 80 km, large variations in elevation — a maximum elevation change of 1,000 m.

The land around Sept-Îles is covered by water (54%) and artificial surfaces (22%) within 3 km, water (52%) and trees (38%) within 16 km, and trees (64%) and water (33%) within 80 km.

3 km
42 m
16 km
370 m
80 km
1,000 m
treesgrasslandartificial surfacesbare terrainwaterwetland
September weather nearby: Baie-Comeau 168 km · Rimouski 249 km · Edmundston 345 km · Rivière-du-Loup 350 km · Miramichi 358 km · Chicoutimi 393 km · Saguenay 393 km · Jonquière 405 km

Canada travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 83% of US
price level, 2025
GDP per capita
$55,698
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
2
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 53%none 35%Muslim 5%Hindu 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sept-Îles (50.2001°, -66.3821°, elevation 5 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).