Port Colborne weather in September

In September, Port Colborne sees average daytime highs of 21°C and overnight lows near 16°C, with 90 mm of rain across 10.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-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 35% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Port Colborne's 3rd-clearest and 8th-windiest month. For the whole year in context, see Port Colborne's year-round climate.

Daytime high
21°
4th warmest
Overnight low
16°
9th coldest
Rainfall
90 mm
10.3 wet days
Daylight
12 h 18 min
6:03 AM – 6:20 PM
Cloud cover
54%
3rd clearest
Wind
16 km/h
8th windiest
Solar energy
4.17 kWh/m²
Travel score
6.4
out of 10

Port Colborne is city in Niagara Region, Ontario, Canada.

Founded
1830

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 Port Colborne reaches about 21°C in the afternoon and slips back to 16°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 25°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12318
22318
32318
42318
52318
62218
72217
82217
92217
102217
112117
122117
132116
142116
152116
162116
172016
182015
192015
202015
212015
221915
231914
241914
251914
261914
271813
281813
291813
301813

How September really feels in Port Colborne

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.

Port Colborne weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -6°7712.48.79.20.0
Feb-1° / -6°609.4710.20.0
Mar / -3°7710.94.811.60.0
Apr / 10011.91.813.11.7
May16° / 11°9012.2014.44.8
Jun22° / 17°10312.1015.16.4
Jul25° / 20°10512014.86.7
Aug24° / 20°9010.9013.86.9
Sep21° / 16°9010.3012.36.4
Oct14° / 10°9812.40.110.83.9
Nov / 8511.62.59.51.2
Dec / -1°83126.88.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 46%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25842
35941
45941
55842
65842
75743
85743
95644
105545
115545
125446
135545
145446
155446
165347
175347
185446
195446
205446
215446
225248
235248
245248
255248
265248
275050
285050
295050
305050

Chance of precipitation in September

Any precipitation

Port Colborne gets around 90 mm of rain over 10.3 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 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
232
332
433
533
634
734
834
934
1034
1134
1234
1334
1433
1533
1633
1732
1832
1932
2033
2133
2233
2334
2435
2536
2637
2738
2839
2940
3040

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 41% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1202627225
2212627215
3222626215
4242626204
5252625194
6262725193
7282725183
8292625172
9312624172
10322624162
11342524151
12362524141
13372523141
14392523131
15402523120
16422422110
17432422100
18452421100
1946242190
2048242080
2150241970
2251241870
2354231760
2456231650
2557231550
2658231540
2759231440
2861231330
2963221230
3065221120

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours 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 84 minutes over September. Sunrise moves from 5:46 AM to 6:19 AM, and sunset from 6:47 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:466:47
213.05:476:46
312.95:486:44
412.95:496:42
512.85:506:40
612.85:516:38
712.75:536:37
812.75:546:35
912.65:556:33
1012.65:566:31
1112.55:576:29
1212.55:586:27
1312.45:596:25
1412.46:006:24
1512.36:026:22
1612.36:036:20
1712.26:046:18
1812.26:056:16
1912.16:066:14
2012.16:076:12
2112.06:086:11
2212.06:096:09
2311.96:116:07
2411.96:126:05
2511.86:136:03
2611.86:146:01
2711.76:155:59
2811.76:165:58
2911.66:175:56
3011.66:195:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.17 kWh/m².

For context, solar energy here swings from a low near 1.27 kWh/m² to a high of 6.37 kWh/m² in June across the year — September's 4.17 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.2Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Port Colborne?

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
3.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Port Colborne for sightseeing.

What to pack for Port Colborne in September

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

In September, Port Colborne sees daytime highs around 21°C and nights near 16°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Port Colborne in September

The nearest coast averages about 21°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 23°C and coldest in February near 1°C.

It's comfortable for a long swim from Jul 4 to Sep 20 — about 2.6 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan3Bracing
Feb1Bracing
Mar1Bracing
Apr3Bracing
May9Bracing
Jun17Cool
Jul22Refreshing
Aug23Refreshing
Sep21Refreshing
Oct16Cool
Nov10Bracing
Dec6Bracing

UV index in Port Colborne in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Port Colborne peaks around June 21 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 21UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May7High
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Port Colborne 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 Port Colborne is worst in July — around 15 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1315 µg/m³Nov 177 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar12Good
Apr12Moderate
May14Moderate
Jun15Moderate
Jul15Moderate
Aug13Moderate
Sep11Good
Oct7Good
Nov7Good
Dec7Good
Location & terrain

Where is Port Colborne?

Port Colborne sits at 42.9°N, 79.2°W, 188 m above sea level, in Canada. The nearest listed city is Welland, 9.0 km away.

Topography around Port Colborne

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

Within 3 km, the terrain around Port Colborne has only modest variations in elevation — a maximum elevation change of 39 m around an average of 180 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, large variations in elevation — a maximum elevation change of 646 m.

The land around Port Colborne is covered by grassland (28%) and trees (25%) within 3 km, water (37%), trees (24%) and cropland (20%) within 16 km, and water (38%) and trees (32%) within 80 km.

3 km
39 m
16 km
100 m
80 km
646 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Welland 9.0 km · Thorold 24 km · Fort Erie 24 km · Niagara Falls 26 km · Niagara Falls 26 km · Grand Island 27 km · Buffalo 29 km · St. Catharines 30 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 Port Colborne (42.9001°, -79.2329°, elevation 188 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).