Gatineau weather in September

In September, Gatineau sees average daytime highs of 20°C and overnight lows near 10°C, with 95 mm of rain across 10.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 4th-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 29% 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 Gatineau's 3rd-clearest and 9th-windiest month. For the whole year in context, see Gatineau's year-round climate.

Daytime high
20°
4th warmest
Overnight low
10°
9th coldest
Rainfall
95 mm
10.4 wet days
Daylight
12 h 18 min
5:48 AM – 6:07 PM
Cloud cover
60%
3rd clearest
Wind
10 km/h
9th windiest
Solar energy
3.82 kWh/m²
Travel score
6.2
out of 10

Gatineau is city in Quebec, Canada.

Air quality
Good
PM2.5 7 µg/m³ · 2019
Density
877/km²
people per km²
Founded
1933

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 Gatineau 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 14°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
22312
32312
42212
52212
62212
72211
82211
92111
102111
112111
122111
132110
142110
152010
162010
172010
18209
19209
20199
21199
22199
23198
24188
25188
26188
27188
28177
29177
30177

How September really feels in Gatineau

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.

Gatineau weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-6° / -15°7310.59.78.90.0
Feb-4° / -14°578.78.110.10.0
Mar / -8°739.96.811.60.0
Apr11° / 9011.13.213.22.6
May19° / 8811.40.214.75.6
Jun23° / 12°9911.7015.46.4
Jul26° / 15°9812.4015.16.4
Aug24° / 14°9011.1013.96.7
Sep20° / 10°9510.4012.36.2
Oct12° / 9912.30.710.73.1
Nov / -2°8311.44.49.30.4
Dec-2° / -9°7911.49.18.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24951
34951
44852
54852
64852
74852
84852
94753
104654
114654
124654
134753
144753
154555
164555
174555
184555
194555
204456
214456
224357
234258
244258
254159
264060
273961
283961
293763
303763

Chance of precipitation in September

Any precipitation

Gatineau gets around 95 mm of rain over 10.4 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 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
232
332
433
533
633
734
834
934
1034
1134
1234
1334
1434
1534
1634
1734
1834
1934
2034
2135
2235
2335
2436
2536
2636
2737
2837
2938
3038

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 67% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1472518101
249241791
350241791
452231681
553231681
656221570
756221570
858211470
960211360
1060211360
1163201250
1263201250
1364201240
1466191140
1566191140
1668191030
1768191030
1869181030
197118920
207217920
217217920
227516810
237615810
247714810
257913710
268012710
278311600
288410600
298510500
30869500

Wind in September

Winds average 10 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
1210calm
1310calm
1410calm
1510calm
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 5:29 AM to 6:06 AM, and sunset from 6:36 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:296:36
213.15:306:34
313.05:316:32
413.05:336:30
512.95:346:28
612.95:356:26
712.85:366:25
812.75:386:23
912.75:396:21
1012.65:406:19
1112.65:416:17
1212.55:436:15
1312.55:446:13
1412.45:456:11
1512.45:466:09
1612.35:486:07
1712.35:496:05
1812.25:506:03
1912.25:526:01
2012.15:535:59
2112.05:545:57
2212.05:555:55
2311.95:575:52
2411.95:585:50
2511.85:595:48
2611.86:005:47
2711.76:025:45
2811.76:035:43
2911.66:045:41
3011.56:065:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.82 kWh/m².

For context, solar energy here swings from a low near 1.19 kWh/m² to a high of 5.97 kWh/m² in June across the year — September's 3.82 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.1Bright
104.1Bright
114.0Bright
124.0Moderate
133.9Moderate
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
273.2Moderate
283.2Moderate
293.1Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Gatineau?

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
3.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Gatineau for sightseeing.

What to pack for Gatineau in September

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

In September, Gatineau 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 Gatineau 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 Gatineau peaks around July 14 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 14UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul8Very high
Aug5Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Gatineau?

Gatineau sits at 45.5°N, 75.7°W, 53 m above sea level, in Canada. The nearest listed city is Vanier, 5.0 km away.

Topography around Gatineau

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

Within 3 km, the terrain around Gatineau has only modest variations in elevation — a maximum elevation change of 70 m around an average of 57 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 363 m; within 80 km, significant variations in elevation — a maximum elevation change of 585 m.

The land around Gatineau is covered by artificial surfaces (44%) and trees (25%) within 3 km, trees (53%) and artificial surfaces (20%) within 16 km, and trees (64%) and cropland (20%) within 80 km.

3 km
70 m
16 km
363 m
80 km
585 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Vanier 5.0 km · Hull 6.0 km · Centretown 7.0 km · Ottawa 7.0 km · Templeton-Est 9.0 km · Ottawa South 10 km · Alta Vista 11 km · Aylmer 12 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 Gatineau (45.4772°, -75.7016°, elevation 53 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).