Greater Sudbury weather in September

In September, Greater Sudbury sees average daytime highs of 19°C and overnight lows near 8°C, with 92 mm of rain across 11 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 16°C by the end. The sky is clear or mostly clear about 25% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Greater Sudbury's 3rd-clearest and 9th-windiest month. For the whole year in context, see Greater Sudbury's year-round climate.

Daytime high
19°
4th warmest
Overnight low
9th coldest
Rainfall
92 mm
11 wet days
Daylight
12 h 18 min
6:09 AM – 6:28 PM
Cloud cover
63%
3rd clearest
Wind
12 km/h
9th windiest
Solar energy
3.69 kWh/m²
Travel score
5.7
out of 10

Greater Sudbury is city and unitary authority in Ontario, Canada.

Density
52/km²
people per km²
Founded
1893

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 21°C in the first days to 16°C by the end.

A typical September day in Greater Sudbury reaches about 19°C in the afternoon and slips back to 8°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 24°C. Set against its neighbours, September runs about 5°C cooler than August and about 8°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12211
22111
32111
42110
52110
62110
72010
82010
92010
10209
11209
12199
13199
14199
15198
16198
17188
18188
19188
20188
21177
22177
23177
24177
25167
26166
27166
28166
29156
30155

How September really feels in Greater Sudbury

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.

Greater Sudbury weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-7° / -17°5310.110.98.80.0
Feb-5° / -16°417.67.9100.0
Mar / -10°507.86.111.60.0
Apr10° / -1°709.83.913.32.1
May17° / 7210.60.414.85.4
Jun23° / 11°8110.8015.56.5
Jul25° / 14°8710.7015.26.8
Aug23° / 13°9011.20146.7
Sep19° / 9211012.45.7
Oct11° / 9412.70.910.72.3
Nov / -5°73116.39.20.1
Dec-4° / -12°59119.98.50.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24654
34555
44654
54555
64555
74654
84555
94555
104555
114456
124456
134456
144357
154258
164357
174357
184357
194258
204159
214060
224159
234060
243961
253961
263862
273763
283763
293763
303763

Chance of precipitation in September

Any precipitation

Greater Sudbury gets around 92 mm of rain over 11 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 36% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
234
335
435
535
635
735
835
935
1035
1135
1235
1335
1435
1535
1635
1735
1836
1936
2036
2136
2237
2337
2437
2538
2638
2739
2839
2939
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 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15921146
25921146
36021136
46320125
56320125
66420115
76520105
86620104
96620104
10681994
11691993
12701983
13711883
14711883
15731872
16741772
17751762
18761662
19771661
20791551
21801451
22801451
23821341
24831241
25841231
26851131
27861031
28861031
2988921
3089920

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712light breeze
2812light breeze
2912light breeze
3012light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 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 102 minutes over September. Sunrise moves from 5:49 AM to 6:27 AM, and sunset from 6:59 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:496:59
213.15:506:57
313.15:516:55
413.05:536:53
512.95:546:51
612.95:556:49
712.85:576:47
812.85:586:45
912.75:596:42
1012.76:016:40
1112.66:026:38
1212.66:036:36
1312.56:056:34
1412.46:066:32
1512.46:076:30
1612.36:096:28
1712.36:106:26
1812.26:116:24
1912.26:126:22
2012.16:146:20
2112.06:156:18
2212.06:166:16
2311.96:186:14
2411.96:196:12
2511.86:216:09
2611.86:226:07
2711.76:236:05
2811.66:256:03
2911.66:266:01
3011.56:275:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.69 kWh/m².

For context, solar energy here swings from a low near 1.18 kWh/m² to a high of 6.11 kWh/m² in June across the year — September's 3.69 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.3Bright
34.3Bright
44.3Bright
54.2Bright
64.2Bright
74.1Bright
84.1Bright
94.0Bright
104.0Moderate
113.9Moderate
123.9Moderate
133.8Moderate
143.8Moderate
153.7Moderate
163.7Moderate
173.6Moderate
183.6Moderate
193.5Moderate
203.5Moderate
213.4Moderate
223.4Moderate
233.3Moderate
243.3Moderate
253.2Moderate
263.2Moderate
273.1Moderate
283.1Moderate
293.1Moderate
303.0Moderate
Planning a trip in September

Is September a good time to visit Greater Sudbury?

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

5.7
Sightseeing
4th-best month of the year
2.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Greater Sudbury for sightseeing.

What to pack for Greater Sudbury in September

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

In September, Greater Sudbury sees daytime highs around 19°C and nights near 8°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Greater Sudbury in September

The nearest coast averages about 17°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 69 km away) is warmest in August at about 19°C and coldest in March near 1°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May5Bracing
Jun11Bracing
Jul18Cool
Aug19Cool
Sep17Cool
Oct12Bracing
Nov8Bracing
Dec4Bracing

UV index in Greater Sudbury 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 Greater Sudbury peaks around June 20 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 highHighModerateLowJun 20UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun8Very high
Jul7Very high
Aug6High
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Greater Sudbury?

Greater Sudbury sits at 46.5°N, 81.0°W, 266 m above sea level, in Canada. The nearest listed city is Valley East, 17 km away.

Topography around Greater Sudbury

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

Within 3 km, the terrain around Greater Sudbury has only modest variations in elevation — a maximum elevation change of 91 m around an average of 274 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 219 m; within 80 km, significant variations in elevation — a maximum elevation change of 411 m.

The land around Greater Sudbury is covered by trees (43%) and artificial surfaces (33%) within 3 km, trees (65%) within 16 km, and trees (82%) within 80 km.

3 km
91 m
16 km
219 m
80 km
411 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Valley East 17 km · North Bay 118 km · Huntsville 188 km · Bracebridge 208 km · Midland 212 km · Owen Sound 214 km · Timmins 221 km · Collingwood 231 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 Greater Sudbury (46.49°, -80.99°, elevation 266 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).