Sainte-Thérèse weather in September

In September, Sainte-Thérèse sees average daytime highs of 20°C and overnight lows near 10°C, with 94 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 23°C in the first days to 17°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 Sainte-Thérèse's 1st-clearest and 10th-windiest month. For the whole year in context, see Sainte-Thérèse's year-round climate.

Daytime high
20°
4th warmest
Overnight low
10°
9th coldest
Rainfall
94 mm
10 wet days
Daylight
12 h 18 min
5:40 AM – 5:59 PM
Cloud cover
58%
1st clearest
Wind
11 km/h
10th windiest
Solar energy
3.87 kWh/m²
Travel score
6.3
out of 10

Sainte-Thérèse is town in Québec, Canada.

Density
2,683/km²
people per km²
Founded
1849

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 17°C by the end.

A typical September day in Sainte-Thérèse 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 5°C cooler than August and about 8°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12313
22313
32313
42212
52212
62212
72212
82212
92211
102111
112111
122111
132111
142111
152010
162010
172010
182010
192010
20199
21199
22199
23199
24189
25188
26188
27188
28178
29178
30177

How September really feels in Sainte-Thérèse

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.

Sainte-Thérèse 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°7610.29.68.90.0
Feb-4° / -13°628.78.110.10.0
Mar / -7°7410.4711.60.0
Apr11° / 10311.33.213.32.5
May18° / 9511.50.214.75.6
Jun24° / 13°10111.7015.46.4
Jul26° / 16°9512.3015.16.3
Aug25° / 15°9611.6013.96.7
Sep20° / 10°9410012.36.3
Oct13° / 10711.40.910.73.2
Nov / -2°8711.14.29.30.4
Dec-2° / -10°8611.69.58.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% 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 (%)
15149
25149
35149
45149
55149
65149
75149
85050
95149
105149
115149
125050
135050
145149
155149
165050
175050
185050
195050
204852
214852
224852
234753
244753
254654
264456
274357
284258
294258
304258

Chance of precipitation in September

Any precipitation

Sainte-Thérèse gets around 94 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 34% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
231
332
432
532
633
733
833
934
1034
1134
1234
1334
1434
1534
1634
1734
1834
1934
2034
2134
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 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 (%)
147261891
249251790
351251680
451251680
553241580
655241470
756241370
857241360
959231260
1059231260
1161221250
1261221250
1363211150
1465201140
1565201140
1667191040
1768191030
1869181030
197018930
207117930
217316920
227515820
237614820
247714720
257813720
268112610
278211610
288410510
29859510
30878410

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 11 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
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 5:21 AM to 5:58 AM, and sunset from 6:29 PM to 5:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:216:29
213.15:226:27
313.05:246:25
413.05:256:23
512.95:266:21
612.95:276:19
712.85:296:17
812.85:306:15
912.75:316:13
1012.65:336:11
1112.65:346:09
1212.55:356:07
1312.55:366:05
1412.45:386:03
1512.45:396:01
1612.35:405:59
1712.35:415:57
1812.25:435:55
1912.25:445:53
2012.15:455:51
2112.05:475:49
2212.05:485:47
2311.95:495:45
2411.95:505:43
2511.85:525:41
2611.85:535:39
2711.75:545:37
2811.75:565:35
2911.65:575:33
3011.55:585:31

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 1.23 kWh/m² to a high of 5.93 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
243.4Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.2Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Sainte-Thérèse?

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

6.3
Sightseeing
3rd-best month of the year
3.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sainte-Thérèse for sightseeing.

What to pack for Sainte-Thérèse in September

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

In September, Sainte-Thérèse 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 Sainte-Thérèse 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 Sainte-Thérèse 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 Sainte-Thérèse?

Sainte-Thérèse sits at 45.6°N, 73.8°W, 36 m above sea level, in Canada. The nearest listed city is Boisbriand, 3.0 km away.

Topography around Sainte-Thérèse

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

Within 3 km, the terrain around Sainte-Thérèse has only modest variations in elevation — a maximum elevation change of 68 m around an average of 45 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 133 m; within 80 km, large variations in elevation — a maximum elevation change of 924 m.

The land around Sainte-Thérèse is covered by trees (46%) and artificial surfaces (41%) within 3 km, trees (36%), artificial surfaces (25%) and cropland (23%) within 16 km, and trees (48%) and cropland (36%) within 80 km.

3 km
68 m
16 km
133 m
80 km
924 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Boisbriand 3.0 km · Blainville 5.0 km · Saint-Louis-de-Terrebonne 8.0 km · Saint-Eustache 10 km · Val-des-Arbres 13 km · Deux-Montagnes 13 km · Laval 13 km · Chomedey 13 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 Sainte-Thérèse (45.6392°, -73.8276°, elevation 36 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).