Gloucester weather in September

In September, Gloucester sees average daytime highs of 21°C and overnight lows near 10°C, with 90 mm of rain across 9.9 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 18°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 36 min by month's end. Set against the rest of the year, September is Gloucester's 3rd-clearest and 9th-windiest month. For the whole year in context, see Gloucester's year-round climate.

Daytime high
21°
4th warmest
Overnight low
10°
9th coldest
Rainfall
90 mm
9.9 wet days
Daylight
12 h 18 min
5:47 AM – 6:06 PM
Cloud cover
59%
3rd clearest
Wind
11 km/h
9th windiest
Solar energy
3.87 kWh/m²
Travel score
6.4
out of 10

Gloucester is suburb of and within the City of Ottawa.

Founded
1792

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 18°C by the end.

A typical September day in Gloucester reaches about 21°C in the afternoon and slips back to 10°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 27°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)
12413
22313
32313
42312
52312
62312
72312
82212
92212
102211
112211
122211
132111
142111
152110
162110
172110
182010
192010
20209
21209
22209
23199
24199
25198
26188
27188
28188
29188
30177

How September really feels in Gloucester

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.

Gloucester weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-5° / -14°7010.49.28.90.0
Feb-3° / -13°568.8810.10.0
Mar / -7°7210.26.511.60.1
Apr12° / 9211.32.813.22.9
May19° / 8511.30.214.65.8
Jun24° / 13°9511.3015.46.5
Jul26° / 16°9411.8015.16.3
Aug25° / 15°8610.8013.96.7
Sep21° / 10°909.9012.36.4
Oct13° / 9711.70.610.73.5
Nov / -2°8011.13.59.30.5
Dec-1° / -8°7611.48.78.60.0

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 54%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25149
35149
45149
55050
65050
75050
84951
94852
104951
114852
124852
134753
144753
154654
164654
174654
184654
194654
204555
214456
224456
234357
244258
254159
264060
273961
283961
293862
303763

Chance of precipitation in September

Any precipitation

Gloucester gets around 90 mm of rain over 9.9 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 33% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
231
331
432
532
632
732
832
932
1032
1132
1232
1332
1432
1532
1632
1732
1832
1932
2033
2133
2233
2334
2434
2535
2635
2736
2836
2936
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 64% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1442619111
2452618101
3472518101
448251791
550241781
651241681
752241671
854231571
955231561
1056221561
1159211451
1260211450
1362201350
1463201340
1563201340
1665191240
1766191230
1867181230
1968181130
2069171130
2170171120
2272161020
2373151020
247415920
257714810
267813810
277913710
288112610
298211610
308410510

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 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 5:29 AM to 6:05 AM, and sunset from 6:36 PM to 5:38 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
413.05:326:30
512.95:346:28
612.95:356:26
712.85:366:24
812.75:376:22
912.75:396:20
1012.65:406:18
1112.65:416:16
1212.55:426:14
1312.55:446:12
1412.45:456:10
1512.45:466:08
1612.35:476:06
1712.35:496:04
1812.25:506:02
1912.15:516:00
2012.15:535:58
2112.05:545:56
2212.05:555:54
2311.95:565:52
2411.95:585:50
2511.85:595:48
2611.86:005:46
2711.76:015:44
2811.76:035:42
2911.66:045:40
3011.66:055:38

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 1.21 kWh/m² to a high of 5.99 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
34.4Bright
44.4Bright
54.3Bright
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 Gloucester?

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

6.4
Sightseeing
3rd-best month of the year
3.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Gloucester for sightseeing.

What to pack for Gloucester in September

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

In September, Gloucester sees daytime highs around 21°C and nights near 10°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Gloucester 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 Gloucester 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 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 13UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul8Very high
Aug5Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Gloucester in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Gloucester is worst in June — around 15 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJun 2015 µg/m³Dec 107 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar13Moderate
Apr11Good
May13Moderate
Jun15Moderate
Jul14Moderate
Aug13Moderate
Sep10Good
Oct7Good
Nov7Good
Dec7Good
Location & terrain

Where is Gloucester?

Gloucester sits at 45.4°N, 75.6°W, 93 m above sea level, in Canada. The nearest listed city is Alta Vista, 4.0 km away.

Topography around Gloucester

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

Within 3 km, the terrain around Gloucester has only modest variations in elevation — a maximum elevation change of 45 m around an average of 96 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 167 m; within 80 km, significant variations in elevation — a maximum elevation change of 524 m.

The land around Gloucester is covered by trees (54%) and artificial surfaces (30%) within 3 km, trees (39%) and artificial surfaces (22%) within 16 km, and trees (61%) and cropland (22%) within 80 km.

3 km
45 m
16 km
167 m
80 km
524 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Alta Vista 4.0 km · Ottawa South 6.0 km · Nepean 7.0 km · Ottawa 8.0 km · Centretown 9.0 km · Vanier 10 km · Hull 11 km · Aylmer 15 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 Gloucester (45.35°, -75.6333°, elevation 93 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).