Kingston weather in September

In September, Kingston sees average daytime highs of 20°C and overnight lows near 13°C, with 95 mm of rain across 10.1 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 22°C in the first days to 17°C by the end. The sky is clear or mostly clear about 34% 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 Kingston's 2nd-clearest and 8th-windiest month. For the whole year in context, see Kingston's year-round climate.

Daytime high
20°
4th warmest
Overnight low
13°
9th coldest
Rainfall
95 mm
10.1 wet days
Daylight
12 h 18 min
5:51 AM – 6:09 PM
Cloud cover
55%
2nd clearest
Wind
12 km/h
8th windiest
Solar energy
4.16 kWh/m²
Travel score
6.3
out of 10

Kingston is city in Ontario, Canada.

Air quality
Excellent
PM2.5 5 µg/m³ · 2019
Density
294/km²
people per km²
Founded
1673

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 Kingston reaches about 20°C in the afternoon and slips back to 13°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°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)
12316
22316
32316
42216
52215
62215
72215
82215
92215
102115
112114
122114
132114
142114
152014
162013
172013
182013
192013
201913
211912
221912
231912
241912
251812
261811
271811
281811
291711
301711

How September really feels in Kingston

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.

Kingston 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-3° / -10°7410.88.89.10.0
Feb-2° / -9°599.17.210.20.0
Mar / -5°73105.811.60.0
Apr10° / 10111.5213.22.0
May17° / 10°8111.2014.55.1
Jun22° / 16°9711.4015.36.5
Jul25° / 19°9911.30156.7
Aug24° / 18°9611.1013.86.8
Sep20° / 13°9510.1012.36.3
Oct13° / 10412.70.210.83.5
Nov / 89112.69.40.8
Dec / -5°83127.48.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35545
45545
55545
65545
75545
85545
95545
105545
115446
125446
135446
145446
155347
165347
175347
185347
195347
205149
215149
225149
235050
244951
254951
264852
274852
284753
294654
304654

Chance of precipitation in September

Any precipitation

Kingston gets around 95 mm of rain over 10.1 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 (%)
130
230
330
431
531
632
732
832
933
1033
1133
1233
1333
1433
1534
1634
1734
1834
1934
2035
2135
2236
2336
2437
2538
2638
2739
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 46% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1232827194
2242826184
3262825184
4272825173
5292824163
6302824153
7322823143
8332823142
9352723132
10372722122
11382722121
12402621111
13422621101
14432620101
1545252091
1646251991
1748251980
1851241870
1951241870
2054231760
2155231660
2257231550
2359221450
2461221340
2562211340
2664211230
2766201130
2868201020
297019920
307218820

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

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 5:33 AM to 6:08 AM, and sunset from 6:38 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:336:38
213.05:356:36
313.05:366:34
412.95:376:32
512.95:386:30
612.85:396:29
712.85:416:27
812.75:426:25
912.75:436:23
1012.65:446:21
1112.65:456:19
1212.55:466:17
1312.55:486:15
1412.45:496:13
1512.45:506:11
1612.35:516:09
1712.25:526:07
1812.25:546:05
1912.15:556:03
2012.15:566:02
2112.05:576:00
2212.05:585:58
2311.96:005:56
2411.96:015:54
2511.86:025:52
2611.86:035:50
2711.76:045:48
2811.76:065:46
2911.66:075:44
3011.66:085:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.16 kWh/m².

For context, solar energy here swings from a low near 1.29 kWh/m² to a high of 6.29 kWh/m² in June across the year — September's 4.16 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.7Moderate
253.7Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.4Moderate
Planning a trip in September

Is September a good time to visit Kingston?

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

6.3
Sightseeing
4th-best month of the year
3.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Kingston for sightseeing.

What to pack for Kingston in September

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

In September, Kingston sees daytime highs around 20°C and nights near 13°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Kingston 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 22°C and coldest in March near 1°C.

It's comfortable for a long swim from Jul 13 to Sep 12 — about 2 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan3Bracing
Feb2Bracing
Mar1Bracing
Apr3Bracing
May7Bracing
Jun15Bracing
Jul21Refreshing
Aug22Refreshing
Sep20Cool
Oct15Bracing
Nov10Bracing
Dec6Bracing

UV index in Kingston 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 Kingston peaks around July 12 at about 8 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 12UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May7High
Jun7Very high
Jul8Very high
Aug5High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Kingston?

Kingston sits at 44.2°N, 76.5°W, 70 m above sea level, in Canada. The nearest listed city is Greater Napanee, 37 km away.

Topography around Kingston

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

Within 3 km, the terrain around Kingston has only modest variations in elevation — a maximum elevation change of 43 m around an average of 84 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 94 m; within 80 km, significant variations in elevation — a maximum elevation change of 487 m.

The land around Kingston is covered by water (49%) and artificial surfaces (25%) within 3 km, water (37%), trees (25%) and grassland (21%) within 16 km, and trees (47%) and water (30%) within 80 km.

3 km
43 m
16 km
94 m
80 km
487 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Greater Napanee 37 km · Watertown 54 km · Prince Edward 66 km · Belleville 72 km · Brockville 75 km · Oswego 86 km · Quinte West 87 km · Clay 119 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 Kingston (44.2298°, -76.481°, elevation 70 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).