Granby weather in September

In September, Granby sees average daytime highs of 20°C and overnight lows near 10°C, with 98 mm of rain across 10.9 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 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 36 min by month's end. Set against the rest of the year, September is Granby's 2nd-clearest and 9th-windiest month. For the whole year in context, see Granby's year-round climate.

Daytime high
20°
4th warmest
Overnight low
10°
9th coldest
Rainfall
98 mm
10.9 wet days
Daylight
12 h 18 min
5:36 AM – 5:55 PM
Cloud cover
59%
2nd clearest
Wind
11 km/h
9th windiest
Solar energy
3.87 kWh/m²
Travel score
6.1
out of 10

Granby is city in Estrie, Quebec, Canada.

Density
424/km²
people per km²
Founded
1859

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 Granby 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 25°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)
12312
22212
32212
42212
52212
62212
72211
82111
92111
102111
112111
122110
132110
142010
152010
162010
17209
18209
19199
20199
21199
22199
23188
24188
25188
26188
27178
28177
29177
30177

How September really feels in Granby

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.

Granby 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° / -13°7812.111.18.90.0
Feb-3° / -13°6410.19.410.10.0
Mar / -7°7811.47.711.60.1
Apr11° / 9912.3313.22.4
May18° / 10812.90.214.75.3
Jun23° / 13°11813.5015.46.2
Jul25° / 15°10813.7015.16.2
Aug24° / 14°11112.7013.96.6
Sep20° / 10°9810.9012.36.1
Oct13° / 11412.60.710.73.2
Nov / -2°9012.64.99.30.4
Dec-1° / -9°901310.38.60.0

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 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 (%)
14951
24852
34951
44951
54951
64951
74951
84951
94951
104951
114951
125050
134951
144951
154951
164951
174753
184654
194654
204654
214555
224555
234456
244357
254258
264258
274159
284060
294060
304060

Chance of precipitation in September

Any precipitation

Granby gets around 98 mm of rain over 10.9 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 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
336
436
537
637
737
837
937
1037
1137
1237
1337
1437
1537
1637
1737
1837
1937
2037
2137
2237
2337
2437
2537
2637
2737
2837
2937
3037

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 (%)
1462617101
2482616101
350251691
450251591
554241480
654241480
756241370
858231360
958231360
1060221260
1161221250
1262211250
1363201250
1464201240
1566191140
1667181140
1767181140
1868171140
1970161040
2071161030
2172151030
227315930
237414930
247613830
257813720
267912720
278012620
288111620
298410510
308410510

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
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over September. Sunrise moves from 5:17 AM to 5:54 AM, and sunset from 6:24 PM to 5:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:176:24
213.15:186:22
313.05:206:20
413.05:216:18
512.95:226:16
612.95:236:15
712.85:256:13
812.75:266:11
912.75:276:09
1012.65:286:07
1112.65:306:05
1212.55:316:03
1312.55:326:01
1412.45:335:59
1512.45:355:57
1612.35:365:55
1712.35:375:53
1812.25:385:51
1912.25:405:49
2012.15:415:47
2112.05:425:45
2212.05:435:43
2311.95:455:41
2411.95:465:39
2511.85:475:37
2611.85:495:35
2711.75:505:33
2811.75:515:31
2911.65:525:29
3011.65:545:27

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 1.2 kWh/m² to a high of 5.88 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
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 Granby?

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

6.1
Sightseeing
4th-best month of the year
3.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Granby for sightseeing.

What to pack for Granby in September

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

In September, Granby sees daytime highs around 20°C and nights near 10°C. Worth packing: rain gear. About 11 days see rain.

rain gear

UV index in Granby 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 Granby 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 Granby?

Granby sits at 45.4°N, 72.7°W, 102 m above sea level, in Canada. The nearest listed city is Saint-Hyacinthe, 31 km away.

Topography around Granby

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

Within 3 km, the terrain around Granby has only modest variations in elevation — a maximum elevation change of 97 m around an average of 120 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 511 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,288 m.

The land around Granby is covered by trees (41%) and artificial surfaces (40%) within 3 km, trees (54%) and cropland (30%) within 16 km, and trees (51%) and cropland (33%) within 80 km.

3 km
97 m
16 km
511 m
80 km
1,288 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Saint-Hyacinthe 31 km · Mont-Saint-Hilaire 40 km · Beloeil 41 km · Saint-Jean-sur-Richelieu 43 km · Chambly 43 km · Saint-Basile-le-Grand 45 km · Magog 48 km · Saint-Bruno-de-Montarville 50 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 Granby (45.4001°, -72.7324°, elevation 102 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).