Trois-Rivières weather in September

In September, Trois-Rivières sees average daytime highs of 20°C and overnight lows near 11°C, with 98 mm of rain across 11 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 17°C by the end. The sky is clear or mostly clear about 29% 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 Trois-Rivières's 2nd-clearest and 9th-windiest month. For the whole year in context, see Trois-Rivières's year-round climate.

Daytime high
20°
4th warmest
Overnight low
11°
9th coldest
Rainfall
98 mm
11 wet days
Daylight
12 h 18 min
5:35 AM – 5:54 PM
Cloud cover
59%
2nd clearest
Wind
11 km/h
9th windiest
Solar energy
3.75 kWh/m²
Travel score
6.0
out of 10

Trois-Rivières is city in Quebec, Canada.

Air quality
Good
PM2.5 7 µg/m³ · 2019
Density
500/km²
people per km²
Founded
1846

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 22°C in the first days to 17°C by the end.

A typical September day in Trois-Rivières reaches about 20°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 25°C. Set against its neighbours, September runs about 5°C cooler than August and about 8°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12214
22213
32213
42213
52213
62213
72113
82112
92112
102112
112112
122012
132011
142011
152011
162011
172011
181910
191910
201910
211910
221810
23189
24189
25189
26179
27179
28178
29178
30168

How September really feels in Trois-Rivières

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.

Trois-Rivières weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-6° / -15°7710.910.48.80.0
Feb-4° / -14°618.88.7100.0
Mar / -7°7610.57.111.60.0
Apr10° / 9811.53.213.32.0
May18° / 9612.40.214.75.4
Jun23° / 14°10912.3015.56.3
Jul25° / 16°11213.5015.26.2
Aug24° / 15°10912.10146.6
Sep20° / 11°9811012.46.0
Oct12° / 11111.50.810.73.1
Nov / -2°8911.44.19.20.3
Dec-2° / -10°9011.79.88.50.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35248
45149
55149
65149
75050
84951
94852
104852
114753
124753
134852
144753
154753
164654
174654
184654
194654
204654
214555
224555
234357
244357
254357
264159
274159
284159
294060
304060

Chance of precipitation in September

Any precipitation

Trois-Rivières gets around 98 mm of rain over 11 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 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
337
437
537
637
738
838
938
1038
1138
1238
1337
1437
1537
1637
1737
1837
1937
2037
2137
2237
2336
2436
2536
2636
2736
2836
2936
3035

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 66% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
145261991
247261891
349261781
450261681
552251571
654251470
756251360
856251360
959241250
1059241250
1161231150
1263221140
1363221140
1465211040
1567201030
1668191030
1768191030
187018930
197117930
207217920
217316920
227515820
237614820
247714720
257813720
268112610
278211610
288311510
298410510
30869410

Wind in September

Winds average 11 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
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

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 5:15 AM to 5:53 AM, and sunset from 6:25 PM to 5:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:156:25
213.15:166:23
313.05:186:21
413.05:196:19
512.95:206:17
612.95:226:15
712.85:236:13
812.85:246:11
912.75:266:09
1012.75:276:07
1112.65:286:05
1212.55:306:02
1312.55:316:00
1412.45:325:58
1512.45:335:56
1612.35:355:54
1712.35:365:52
1812.25:375:50
1912.25:395:48
2012.15:405:46
2112.05:415:44
2212.05:435:42
2311.95:445:40
2411.95:455:38
2511.85:475:36
2611.85:485:34
2711.75:495:32
2811.65:515:30
2911.65:525:28
3011.55:535:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.75 kWh/m².

For context, solar energy here swings from a low near 1.22 kWh/m² to a high of 5.86 kWh/m² in June across the year — September's 3.75 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.3Bright
44.3Bright
54.3Bright
64.2Bright
74.2Bright
84.1Bright
94.1Bright
104.0Bright
114.0Moderate
123.9Moderate
133.9Moderate
143.8Moderate
153.8Moderate
163.7Moderate
173.7Moderate
183.6Moderate
193.6Moderate
203.5Moderate
213.5Moderate
223.4Moderate
233.4Moderate
243.3Moderate
253.3Moderate
263.2Moderate
273.1Moderate
283.1Moderate
293.1Moderate
303.0Moderate
Planning a trip in September

Is September a good time to visit Trois-Rivières?

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

6.0
Sightseeing
4th-best month of the year
2.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Trois-Rivières for sightseeing.

What to pack for Trois-Rivières in September

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

In September, Trois-Rivières sees daytime highs around 20°C and nights near 11°C. Worth packing: rain gear. About 11 days see rain.

rain gear

UV index in Trois-Rivières in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Trois-Rivières peaks around July 13 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug3Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Trois-Rivières?

Trois-Rivières sits at 46.3°N, 72.5°W, 16 m above sea level, in Canada. The nearest listed city is Shawinigan, 29 km away.

Topography around Trois-Rivières

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

Within 3 km, the terrain around Trois-Rivières has only modest variations in elevation — a maximum elevation change of 56 m around an average of 15 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 109 m; within 80 km, large variations in elevation — a maximum elevation change of 759 m.

The land around Trois-Rivières is covered by artificial surfaces (41%) and water (32%) within 3 km, trees (46%) and cropland (26%) within 16 km, and trees (61%) and cropland (28%) within 80 km.

3 km
56 m
16 km
109 m
80 km
759 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Shawinigan 29 km · Drummondville 52 km · Sorel-Tracy 55 km · Victoriaville 56 km · Joliette 77 km · Saint-Charles-Borromée 78 km · Saint-Hyacinthe 85 km · L'Assomption 89 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 Trois-Rivières (46.3451°, -72.5477°, elevation 16 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. 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).