Mont-Royal weather in September

In September, Mont-Royal sees average daytime highs of 20°C and overnight lows near 12°C, with 92 mm of rain across 10.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 18°C by the end. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Mont-Royal's 2nd-clearest and 9th-windiest month. For the whole year in context, see Mont-Royal's year-round climate.

Daytime high
20°
4th warmest
Overnight low
12°
9th coldest
Rainfall
92 mm
10.1 wet days
Daylight
12 h 18 min
5:39 AM – 5:58 PM
Cloud cover
57%
2nd clearest
Wind
12 km/h
9th windiest
Solar energy
3.87 kWh/m²
Travel score
6.3
out of 10

Mont-Royal is city in Quebec, Canada.

Density
2,538/km²
people per km²
Founded
1912

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 23°C in the first days to 18°C by the end.

A typical September day in Mont-Royal reaches about 20°C in the afternoon and slips back to 12°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 26°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12315
22314
32314
42314
52314
62214
72214
82213
92213
102213
112213
122113
132112
142112
152112
162112
172012
182011
192011
202011
211911
221911
231911
241910
251810
261810
271810
28189
29179
30179

How September really feels in Mont-Royal

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.

Mont-Royal 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-5° / -13°7410.39.28.90.0
Feb-3° / -12°6097.910.10.0
Mar / -6°7310.46.411.60.0
Apr10° / 10211.42.613.22.2
May18° / 9311.3014.75.4
Jun23° / 15°9911.6015.46.4
Jul26° / 17°8712.2015.16.4
Aug25° / 16°9111.3013.96.8
Sep20° / 12°9210.1012.36.3
Oct13° / 10711.50.410.73.5
Nov / -1°8611.33.39.30.6
Dec-1° / -8°8511.58.98.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% 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 51%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45248
55248
65248
75149
85248
95149
105149
115149
125149
135050
144951
154951
164951
174951
184951
194951
204951
214852
224753
234753
244654
254654
264456
274456
284357
294357
304258

Chance of precipitation in September

Any precipitation

Mont-Royal gets around 92 mm of rain over 10.1 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 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
130
231
331
431
532
632
733
833
933
1033
1134
1234
1334
1434
1534
1634
1734
1835
1935
2035
2135
2235
2335
2436
2536
2636
2736
2836
2936
3036

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 59% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1372821131
2382821121
3402820121
4412819111
5432818101
645281891
746271791
848271681
949271671
1050261671
1153251561
1254251560
1357241450
1458231450
1558231450
1661221340
1761221340
1863211240
1965201230
2066201130
2167191130
2269181030
2369181030
247217920
257416820
267515820
277714720
288013610
298112610
308212510

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 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 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 96 minutes over September. Sunrise moves from 5:21 AM to 5:57 AM, and sunset from 6:28 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:216:28
213.15:226:26
313.05:236:24
413.05:246:22
512.95:266:20
612.95:276:18
712.85:286:16
812.75:296:14
912.75:316:12
1012.65:326:10
1112.65:336:08
1212.55:346:06
1312.55:366:04
1412.45:376:02
1512.45:386:00
1612.35:395:58
1712.35:415:56
1812.25:425:54
1912.25:435:52
2012.15:455:50
2112.05:465:48
2212.05:475:46
2311.95:485:44
2411.95:505:42
2511.85:515:40
2611.85:525:38
2711.75:545:36
2811.75:555:34
2911.65:565:32
3011.55:575:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.87 kWh/m².

For context, solar energy here swings from a low near 1.24 kWh/m² to a high of 5.9 kWh/m² in June across the year — September's 3.87 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.0Bright
134.0Moderate
144.0Moderate
153.9Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.5Moderate
233.5Moderate
243.4Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.2Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Mont-Royal?

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

6.3
Sightseeing
4th-best month of the year
3.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Mont-Royal for sightseeing.

What to pack for Mont-Royal in September

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

In September, Mont-Royal sees daytime highs around 20°C and nights near 12°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Mont-Royal 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 Mont-Royal peaks around July 13 at about 8 (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 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Mont-Royal?

Mont-Royal sits at 45.5°N, 73.6°W, 47 m above sea level, in Canada. The nearest listed city is Parc-Extension, 2.0 km away.

Topography around Mont-Royal

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

Within 3 km, the terrain around Mont-Royal has only modest variations in elevation — a maximum elevation change of 163 m around an average of 54 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 292 m; within 80 km, large variations in elevation — a maximum elevation change of 737 m.

The land around Mont-Royal is covered by artificial surfaces (71%) and trees (23%) within 3 km, artificial surfaces (50%) and trees (22%) within 16 km, and trees (44%) and cropland (39%) within 80 km.

3 km
163 m
16 km
292 m
80 km
737 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Parc-Extension 2.0 km · Saint-Laurent 2.0 km · Outremont 3.0 km · Snowdon 4.0 km · Rosemont–La Petite-Patrie 4.0 km · Mile End 4.0 km · Cartierville 5.0 km · Montreal 5.0 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 Mont-Royal (45.5168°, -73.6492°, elevation 47 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).