Saint-Hyacinthe weather in September

In September, Saint-Hyacinthe sees average daytime highs of 20°C and overnight lows near 10°C, with 94 mm of rain across 10.2 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 30% 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-Hyacinthe's 2nd-clearest and 9th-windiest month. For the whole year in context, see Saint-Hyacinthe's year-round climate.

Daytime high
20°
4th warmest
Overnight low
10°
9th coldest
Rainfall
94 mm
10.2 wet days
Daylight
12 h 18 min
5:37 AM – 5:56 PM
Cloud cover
58%
2nd clearest
Wind
11 km/h
9th windiest
Solar energy
3.86 kWh/m²
Travel score
6.3
out of 10

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 Saint-Hyacinthe 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)
12313
22313
32312
42312
52212
62212
72212
82212
92211
102211
112111
122111
132111
142110
152110
162010
172010
182010
19209
20209
21199
22199
23199
24199
25188
26188
27188
28178
29178
30177

How September really feels in Saint-Hyacinthe

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-Hyacinthe 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-5° / -14°7510.8108.90.0
Feb-4° / -13°619.28.410.10.0
Mar / -7°7410.6711.60.1
Apr11° / 9911.52.613.32.6
May19° / 10012.4014.75.6
Jun24° / 13°10812.5015.46.3
Jul26° / 16°10212.9015.16.2
Aug25° / 15°10612013.96.6
Sep20° / 10°9410.2012.36.3
Oct13° / 10911.40.610.73.4
Nov / -2°8711.43.99.30.5
Dec-2° / -9°8611.99.38.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% 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 (%)
15149
25149
35149
45248
55149
65149
75149
85149
95050
105050
115149
125050
135050
144951
154951
164951
174951
184951
194852
204852
214852
224852
234654
244555
254555
264456
274357
284357
294258
304159

Chance of precipitation in September

Any precipitation

Saint-Hyacinthe gets around 94 mm of rain over 10.2 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 (%)
134
234
334
434
534
634
734
834
934
1034
1134
1235
1335
1435
1535
1634
1734
1834
1934
2034
2134
2234
2335
2435
2535
2635
2735
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 65% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1462519101
247251891
349251790
451241690
553241580
653241580
755241470
855241470
958231360
1058231360
1158231360
1261221250
1361221250
1463211240
1564211140
1665201140
1766191140
1868191030
1969181030
2069181030
217117930
227216930
237515820
247614820
257714720
267813720
278012620
288211520
298410510
308510410

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
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

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 5:18 AM to 5:55 AM, and sunset from 6:25 PM to 5:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:186:25
213.15:196:23
313.05:206:22
413.05:216:20
512.95:236:18
612.95:246:16
712.85:256:14
812.85:276:12
912.75:286:10
1012.65:296:08
1112.65:306:06
1212.55:326:04
1312.55:336:02
1412.45:346:00
1512.45:355:58
1612.35:375:56
1712.35:385:54
1812.25:395:52
1912.25:405:50
2012.15:425:48
2112.05:435:46
2212.05:445:44
2311.95:465:42
2411.95:475:39
2511.85:485:37
2611.85:505:35
2711.75:515:33
2811.75:525:32
2911.65:535:30
3011.55:555:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.86 kWh/m².

For context, solar energy here swings from a low near 1.25 kWh/m² to a high of 5.93 kWh/m² in June across the year — September's 3.86 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
143.9Moderate
153.9Moderate
163.8Moderate
173.8Moderate
183.7Moderate
193.7Moderate
203.6Moderate
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 Saint-Hyacinthe?

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

6.3
Sightseeing
2nd-best month of the year
3.4
Beach & pool
4th-best month of the year

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

What to pack for Saint-Hyacinthe in September

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

In September, Saint-Hyacinthe 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-Hyacinthe 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-Hyacinthe 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 December 22 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 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug3Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Saint-Hyacinthe?

Saint-Hyacinthe sits at 45.6°N, 73.0°W, 32 m above sea level, in Canada. The nearest listed city is Mont-Saint-Hilaire, 19 km away.

Topography around Saint-Hyacinthe

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

Within 3 km, the terrain around Saint-Hyacinthe has only modest variations in elevation — a maximum elevation change of 35 m around an average of 34 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 266 m; within 80 km, large variations in elevation — a maximum elevation change of 1,096 m.

The land around Saint-Hyacinthe is covered by artificial surfaces (41%) and cropland (27%) within 3 km, cropland (75%) within 16 km, and trees (44%) and cropland (40%) within 80 km.

3 km
35 m
16 km
266 m
80 km
1,096 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Mont-Saint-Hilaire 19 km · Beloeil 21 km · Saint-Basile-le-Grand 28 km · Sainte-Julie 30 km · Granby 31 km · Chambly 32 km · Saint-Bruno-de-Montarville 32 km · Varennes 37 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-Hyacinthe (45.6308°, -72.957°, elevation 32 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).