Windsor weather in September

In September, Windsor sees average daytime highs of 22°C and overnight lows near 14°C, with 67 mm of rain across 8.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 20°C by the end. The sky is clear or mostly clear about 38% 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 Windsor's 1st-clearest and 9th-windiest month. For the whole year in context, see Windsor's year-round climate.

Daytime high
22°
4th warmest
Overnight low
14°
9th coldest
Rainfall
67 mm
8.3 wet days
Daylight
12 h 18 min
6:18 AM – 6:35 PM
Cloud cover
53%
1st clearest
Wind
14 km/h
9th windiest
Solar energy
4.43 kWh/m²
Travel score
7.0
out of 10

Windsor is city in Essex County, Ontario, Canada.

Air quality
Good
PM2.5 8.5 µg/m³ · 2019
Density
1,570/km²
people per km²
Founded
1749

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 25°C in the first days to 20°C by the end.

A typical September day in Windsor reaches about 22°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 27°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)
12517
22517
32517
42517
52517
62416
72416
82416
92416
102416
112315
122315
132315
142315
152315
162214
172214
182214
192214
202213
212113
222113
232113
242113
252012
262012
272012
282012
291911
301911

How September really feels in Windsor

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.

Windsor weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-0° / -7°6410.25.99.30.0
Feb / -6°548.35.410.30.0
Mar / -2°659.63.811.60.6
Apr13° / 9112113.13.4
May20° / 11°9012.8014.45.7
Jun25° / 17°8610.90156.6
Jul27° / 19°7810.7014.86.4
Aug26° / 19°769.6013.76.8
Sep22° / 14°678.3012.37.0
Oct15° / 698.9010.84.8
Nov / 6991.59.61.5
Dec / -3°629.14.190.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
45941
55842
65842
75842
85842
95743
105743
115644
125545
135644
145545
155545
165446
175446
185446
195446
205446
215446
225347
235347
245347
255248
265248
275149
285149
295248
305149

Chance of precipitation in September

Any precipitation

Windsor gets around 67 mm of rain over 8.3 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 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
429
528
628
728
828
927
1027
1127
1227
1326
1426
1526
1626
1726
1826
1926
2026
2126
2227
2328
2428
2529
2630
2730
2830
2930
3030

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 45% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1202426237
2222426226
3232426216
4252426205
5272425195
6292425184
7312424174
8322424164
9342423163
10362423153
11382322142
12392322142
13412321132
14432321121
15442320121
16462319111
17482218111
18492218101
19512217100
2053221690
2155221580
2256221480
2358221370
2459221270
2562211160
2662211160
2764201060
286620950
296719950
306819850

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light 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 6:02 AM to 6:33 AM, and sunset from 7:02 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:027:02
213.06:037:00
312.96:046:58
412.96:056:57
512.86:066:55
612.86:076:53
712.76:086:51
812.76:096:49
912.66:106:48
1012.66:116:46
1112.56:136:44
1212.56:146:42
1312.46:156:40
1412.46:166:38
1512.36:176:37
1612.36:186:35
1712.26:196:33
1812.26:206:31
1912.16:216:29
2012.16:226:27
2112.06:236:26
2212.06:256:24
2311.96:266:22
2411.96:276:20
2511.86:286:18
2611.86:296:17
2711.76:306:15
2811.76:316:13
2911.66:326:11
3011.66:336:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.43 kWh/m².

For context, solar energy here swings from a low near 1.48 kWh/m² to a high of 6.48 kWh/m² in June across the year — September's 4.43 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.3Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.0Bright
254.0Moderate
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Windsor?

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

7.0
Sightseeing
1st-best month of the year
5.0
Beach & pool
4th-best month of the year

September is one of the better times to visit Windsor for general sightseeing.

What to pack for Windsor in September

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

In September, Windsor sees daytime highs around 22°C and nights near 14°C. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Windsor in September

The nearest coast averages about 20°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 14 km away) is warmest in August at about 23°C and coldest in February near 0°C.

It's comfortable for a long swim from Jul 2 to Sep 15 — about 2.5 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan1Bracing
Feb0Bracing
Mar1Bracing
Apr5Bracing
May11Bracing
Jun18Cool
Jul22Refreshing
Aug23Refreshing
Sep20Refreshing
Oct14Bracing
Nov8Bracing
Dec4Bracing

UV index in Windsor 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 Windsor peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 20UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr6High
May7High
Jun9Very high
Jul8Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Windsor?

Windsor sits at 42.3°N, 83.0°W, 190 m above sea level, in Canada. The nearest listed city is Detroit, 4.0 km away.

Topography around Windsor

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

Within 3 km, the terrain around Windsor has only modest variations in elevation — a maximum elevation change of 41 m around an average of 187 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 98 m; within 80 km, significant variations in elevation — a maximum elevation change of 279 m.

The land around Windsor is covered by artificial surfaces (64%) and trees (21%) within 3 km, artificial surfaces (36%) and trees (20%) within 16 km, and water (29%), trees (26%) and cropland (26%) within 80 km.

3 km
41 m
16 km
98 m
80 km
279 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Detroit 4.0 km · LaSalle 7.0 km · Hamtramck 11 km · Tecumseh 11 km · Dearborn 13 km · Lincoln Park 14 km · Wyandotte 15 km · Allen Park 17 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 Windsor (42.3001°, -83.0165°, elevation 190 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).