Saint-Jérôme weather in September

In September, Saint-Jérôme sees average daytime highs of 20°C and overnight lows near 10°C, with 96 mm of rain across 10 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-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 31% 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 Saint-Jérôme's 1st-clearest and 10th-windiest month. For the whole year in context, see Saint-Jérôme's year-round climate.

Daytime high
20°
4th warmest
Overnight low
10°
9th coldest
Rainfall
96 mm
10 wet days
Daylight
12 h 18 min
5:41 AM – 6:00 PM
Cloud cover
58%
1st clearest
Wind
11 km/h
10th windiest
Solar energy
3.87 kWh/m²
Travel score
6.2
out of 10

Saint-Jérôme is city in Québec, Canada.

Density
591/km²
people per km²
Founded
2002

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 Saint-Jérôme reaches about 20°C in the afternoon and slips back to 10°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 26°C. Set against its neighbours, September runs about 4°C cooler than August and about 8°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12312
22312
32212
42212
52212
62212
72211
82211
92111
102111
112111
122111
132110
142010
152010
162010
172010
18209
19199
20199
21199
22199
23188
24188
25188
26188
27178
28177
29177
30167

How September really feels in Saint-Jérôme

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.

Saint-Jérôme weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-6° / -15°7910.410.18.90.0
Feb-4° / -14°638.98.510.10.0
Mar / -7°7510.47.311.60.0
Apr11° / 10411.43.413.32.4
May18° / 9711.70.214.75.5
Jun23° / 13°10411.8015.56.4
Jul25° / 15°10012.6015.26.3
Aug24° / 14°9811.7013.96.7
Sep20° / 10°9610012.36.2
Oct12° / 10811.40.910.73.1
Nov / -3°8810.94.39.30.3
Dec-2° / -10°8711.59.68.50.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25149
35149
45149
55248
65149
75149
85050
95050
105050
114951
125050
135050
145050
155050
165050
174951
184852
194852
204852
214753
224753
234753
244555
254555
264456
274357
284357
294258
304159

Chance of precipitation in September

Any precipitation

Saint-Jérôme gets around 96 mm of rain over 10 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 33% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
232
332
432
533
633
733
833
934
1034
1134
1234
1334
1433
1533
1633
1733
1833
1933
2033
2133
2234
2334
2434
2534
2634
2734
2835
2935
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 68% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
150251681
253241580
353241580
456231470
556231470
657231370
759221360
860221260
961211260
1062211250
1163201250
1263201250
1366191140
1467181140
1567181140
1668181130
1770171030
1870171030
1972161020
207316920
217415920
227514920
237614820
247813720
258012710
268112610
278211610
288410510
29869410
30869410

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:22 AM to 5:59 AM, and sunset from 6:30 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:226:30
213.15:236:28
313.05:246:26
413.05:256:24
512.95:276:22
612.95:286:20
712.85:296:18
812.85:316:16
912.75:326:14
1012.65:336:12
1112.65:346:10
1212.55:366:08
1312.55:376:06
1412.45:386:04
1512.45:406:02
1612.35:416:00
1712.35:425:58
1812.25:435:56
1912.25:455:54
2012.15:465:52
2112.05:475:50
2212.05:495:48
2311.95:505:46
2411.95:515:44
2511.85:525:42
2611.85:545:40
2711.75:555:38
2811.75:565:36
2911.65:585:34
3011.55:595:32

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 1.22 kWh/m² to a high of 5.95 kWh/m² in June across the year — September's 3.87 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.0Bright
134.0Bright
144.0Moderate
153.9Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.6Moderate
233.5Moderate
243.5Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.2Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Saint-Jérôme?

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

6.2
Sightseeing
4th-best month of the year
3.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Saint-Jérôme for sightseeing.

What to pack for Saint-Jérôme in September

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

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

rain gear

UV index in Saint-Jérôme 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 Saint-Jérôme 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 10 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 10UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Saint-Jérôme?

Saint-Jérôme sits at 45.8°N, 74.0°W, 95 m above sea level, in Canada. The nearest listed city is Mirabel, 16 km away.

Topography around Saint-Jérôme

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

Within 3 km, the terrain around Saint-Jérôme has only modest variations in elevation — a maximum elevation change of 101 m around an average of 102 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 367 m; within 80 km, large variations in elevation — a maximum elevation change of 969 m.

The land around Saint-Jérôme is covered by artificial surfaces (46%) and trees (40%) within 3 km, trees (65%) within 16 km, and trees (57%) and cropland (28%) within 80 km.

3 km
101 m
16 km
367 m
80 km
969 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Mirabel 16 km · Blainville 16 km · Saint-Louis-de-Terrebonne 19 km · Saint-Lin-Laurentides 20 km · Sainte-Thérèse 21 km · Boisbriand 23 km · Saint-Eustache 25 km · Deux-Montagnes 28 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 Saint-Jérôme (45.7804°, -74.0036°, elevation 95 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).