Rimouski weather in September

In September, Rimouski sees average daytime highs of 15°C and overnight lows near 10°C, with 92 mm of rain across 11.3 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 13°C by the end. The sky is clear or mostly clear about 34% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Rimouski's 2nd-clearest and 7th-windiest month. For the whole year in context, see Rimouski's year-round climate.

Daytime high
15°
4th warmest
Overnight low
10°
10th coldest
Rainfall
92 mm
11.3 wet days
Daylight
12 h 18 min
5:18 AM – 5:39 PM
Cloud cover
57%
2nd clearest
Wind
16 km/h
7th windiest
Solar energy
3.7 kWh/m²
Travel score
4.5
out of 10

Rimouski is city of Québec, Canada.

Density
79/km²
people per km²
Founded
1869

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 17°C in the first days to 13°C by the end.

A typical September day in Rimouski reaches about 15°C in the afternoon and slips back to 10°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 19°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11712
21712
31712
41712
51712
61712
71611
81611
91611
101611
111611
121611
131610
141510
151510
161510
171510
181510
191510
20149
21149
22149
23149
24149
25139
26138
27138
28138
29138
30128

How September really feels in Rimouski

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.

Rimouski weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-7° / -14°6410.311.68.60.0
Feb-7° / -13°568.59.19.90.0
Mar-2° / -8°7310.49.911.60.0
Apr / -1°8411.65.513.40.2
May11° / 8612.10.8152.4
Jun16° / 10°8511.3015.84.7
Jul19° / 14°8811.8015.55.9
Aug19° / 14°8410.9014.16.0
Sep15° / 10°9211.3012.44.5
Oct / 10912.50.810.61.7
Nov / -1°9411.66.890.1
Dec-3° / -8°841212.18.20.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
24951
35050
44951
54951
64951
75050
84951
94951
105050
115050
125050
135050
145050
155050
165050
175050
185149
195149
205149
215149
225149
235149
245050
255050
265050
274852
284852
294654
304654

Chance of precipitation in September

Any precipitation

Rimouski gets around 92 mm of rain over 11.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
237
337
437
537
637
736
836
936
1036
1136
1236
1336
1436
1536
1636
1736
1836
1937
2037
2138
2238
2338
2439
2539
2639
2740
2840
2940
3040

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 88% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
171236
274215
375205
476195
579174
680164
781154
883143
984133
1085123
1185123
1287112
1388102
1488102
158992
169181
179181
189271
199271
209271
219460
229460
239550
249550
259640
269640
279730
289730
299730
309820

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 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 102 minutes over September. Sunrise moves from 4:56 AM to 5:38 AM, and sunset from 6:11 PM to 5:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.24:566:11
213.24:586:09
313.14:596:07
413.15:016:05
513.05:026:03
613.05:046:01
712.95:055:58
812.85:065:56
912.85:085:54
1012.75:095:52
1112.75:115:50
1212.65:125:48
1312.55:145:45
1412.55:155:43
1512.45:175:41
1612.35:185:39
1712.35:195:37
1812.25:215:35
1912.25:225:32
2012.15:245:30
2112.05:255:28
2212.05:275:26
2311.95:285:24
2411.95:305:21
2511.85:315:19
2611.75:335:17
2711.75:345:15
2811.65:355:13
2911.65:375:11
3011.55:385:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.7 kWh/m².

For context, solar energy here swings from a low near 1.01 kWh/m² to a high of 6.06 kWh/m² in June across the year — September's 3.7 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.2Bright
54.2Bright
64.1Bright
74.1Bright
84.0Bright
94.0Moderate
103.9Moderate
113.9Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.7Moderate
163.7Moderate
173.6Moderate
183.6Moderate
193.5Moderate
203.5Moderate
213.4Moderate
223.4Moderate
233.4Moderate
243.3Moderate
253.3Moderate
263.2Moderate
273.1Moderate
283.1Moderate
293.0Moderate
303.0Moderate
Planning a trip in September

Is September a good time to visit Rimouski?

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

4.5
Sightseeing
4th-best month of the year
0.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Rimouski for sightseeing.

What to pack for Rimouski in September

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

In September, Rimouski sees daytime highs around 15°C and nights near 10°C. Worth packing: a warm layer and rain gear. About 11 days see rain.

a warm layerrain gear

Sea temperature near Rimouski in September

The nearest coast averages about 9°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 12°C and coldest in February near -0°C.

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

0°5°10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°C)Comfort
Jan0Bracing
Feb0Bracing
Mar0Bracing
Apr2Bracing
May4Bracing
Jun9Bracing
Jul11Bracing
Aug12Bracing
Sep9Bracing
Oct6Bracing
Nov2Bracing
Dec1Bracing

UV index in Rimouski 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 Rimouski peaks around July 12 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 10 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 12UV 7Jan 10UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May5Moderate
Jun6High
Jul7High
Aug2Moderate
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Rimouski?

Rimouski sits at 48.4°N, 68.5°W, 23 m above sea level, in Canada. The nearest listed city is Baie-Comeau, 90 km away.

Topography around Rimouski

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

Within 3 km, the terrain around Rimouski has only modest variations in elevation — a maximum elevation change of 191 m around an average of 36 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 385 m; within 80 km, large variations in elevation — a maximum elevation change of 902 m.

The land around Rimouski is covered by artificial surfaces (33%) and water (30%) within 3 km, water (42%) and trees (34%) within 16 km, and trees (57%) and water (34%) within 80 km.

3 km
191 m
16 km
385 m
80 km
902 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Baie-Comeau 90 km · Rivière-du-Loup 102 km · Edmundston 120 km · Chicoutimi 187 km · Saguenay 188 km · Jonquière 201 km · Alma 231 km · Sept-Îles 249 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 Rimouski (48.4488°, -68.524°, elevation 23 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).