Sault Ste. Marie weather in September

In September, Sault Ste. Marie sees average daytime highs of 18°C and overnight lows near 10°C, with 108 mm of rain across 12.1 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 15°C by the end. The sky is clear or mostly clear about 30% 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 Sault Ste. Marie's 4th-clearest and 9th-windiest month. For the whole year in context, see Sault Ste. Marie's year-round climate.

Daytime high
18°
4th warmest
Overnight low
10°
9th coldest
Rainfall
108 mm
12.1 wet days
Daylight
12 h 18 min
6:22 AM – 6:41 PM
Cloud cover
60%
4th clearest
Wind
12 km/h
9th windiest
Solar energy
3.88 kWh/m²
Travel score
5.4
out of 10

Sault Ste. Marie is city in Ontario, Canada.

Air quality
Excellent
PM2.5 5 µg/m³ · 2019
Density
323/km²
people per km²
Founded
1888

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 20°C in the first days to 15°C by the end.

A typical September day in Sault Ste. Marie reaches about 18°C in the afternoon and slips back to 10°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 23°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12113
22113
32013
42012
52012
62012
72012
82012
91912
101911
111911
121911
131911
141911
151811
161810
171810
181810
191810
201710
21179
22179
23179
24169
25169
26168
27168
28158
29158
30157

How September really feels in Sault Ste. Marie

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.

Sault Ste. Marie weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-6° / -14°4610.212.28.80.0
Feb-5° / -13°357.58.1100.0
Mar / -8°468.36.811.60.0
Apr / -1°6710.2413.31.2
May15° / 72100.314.84.4
Jun20° / 11°819.8015.56.3
Jul23° / 15°10111.5015.26.7
Aug22° / 14°9510.90146.6
Sep18° / 10°10812.1012.45.4
Oct11° / 10113.70.510.72.4
Nov / -2°6711.26.69.20.1
Dec-2° / -9°5611118.40.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% 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 53%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25248
35248
45248
55248
65248
75149
85149
95149
105050
115050
124951
134951
144852
154753
164753
174654
184654
194555
204555
214555
224357
234357
244357
254258
264159
274060
284060
294060
304060

Chance of precipitation in September

Any precipitation

Sault Ste. Marie gets around 108 mm of rain over 12.1 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 40% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
238
338
438
539
639
739
839
940
1040
1140
1240
1340
1440
1540
1640
1741
1841
1941
2041
2141
2241
2341
2441
2542
2642
2742
2842
2942
3042

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 65% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14328218
24528207
34627207
44827196
54927186
65126185
75325175
85325175
95624164
105624164
115724154
126023143
136123133
146322123
156322123
166422113
176721102
18692092
19702082
20711982
21731872
22751762
23771652
24791551
25811441
26831331
27841231
28851131
29871021
3088921

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.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light 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 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 6:02 AM to 6:41 AM, and sunset from 7:12 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:027:12
213.16:037:10
313.16:057:08
413.06:067:06
512.96:077:04
612.96:097:02
712.86:107:00
812.86:116:58
912.76:136:56
1012.76:146:54
1112.66:156:52
1212.66:176:50
1312.56:186:48
1412.46:196:46
1512.46:216:44
1612.36:226:41
1712.36:236:39
1812.26:256:37
1912.26:266:35
2012.16:276:33
2112.06:296:31
2212.06:306:29
2311.96:316:27
2411.96:336:25
2511.86:346:23
2611.86:356:21
2711.76:376:19
2811.66:386:17
2911.66:396:15
3011.56:416:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.88 kWh/m².

For context, solar energy here swings from a low near 1.1 kWh/m² to a high of 6.52 kWh/m² in June across the year — September's 3.88 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.5Bright
44.5Bright
54.5Bright
64.4Bright
74.3Bright
84.3Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.0Bright
144.0Moderate
153.9Moderate
163.9Moderate
173.8Moderate
183.7Moderate
193.7Moderate
203.6Moderate
213.6Moderate
223.5Moderate
233.5Moderate
243.4Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Is September a good time to visit Sault Ste. Marie?

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

5.4
Sightseeing
4th-best month of the year
2.0
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sault Ste. Marie for sightseeing.

What to pack for Sault Ste. Marie in September

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

In September, Sault Ste. Marie sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Sault Ste. Marie in September

The nearest coast averages about 16°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 16 km away) is warmest in August at about 19°C and coldest in February 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
Jan1Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May5Bracing
Jun11Bracing
Jul17Cool
Aug19Cool
Sep16Cool
Oct11Bracing
Nov7Bracing
Dec4Bracing

UV index in Sault Ste. Marie 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 Sault Ste. Marie peaks around June 18 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 18UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May7High
Jun8Very high
Jul7Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Sault Ste. Marie?

Sault Ste. Marie sits at 46.5°N, 84.3°W, 186 m above sea level, in Canada. The nearest listed city is Sault Ste. Marie, 3.0 km away.

TimminsMidland

Topography around Sault Ste. Marie

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

Within 3 km, the terrain around Sault Ste. Marie has only modest variations in elevation — a maximum elevation change of 82 m around an average of 198 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 263 m; within 80 km, significant variations in elevation — a maximum elevation change of 491 m.

The land around Sault Ste. Marie is covered by artificial surfaces (45%) and trees (24%) within 3 km, trees (65%) within 16 km, and trees (65%) and water (30%) within 80 km.

3 km
82 m
16 km
263 m
80 km
491 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sault Ste. Marie 3.0 km · Mackinac Island 77 km · Traverse City 219 km · Marquette 234 km · Valley East 255 km · Greater Sudbury 256 km · Timmins 313 km · Midland 323 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 Sault Ste. Marie (46.5168°, -84.3333°, elevation 186 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).