Sylvan Lake weather in September

In September, Sylvan Lake sees average daytime highs of 17°C and overnight lows near 5°C, with 43 mm of precipitation across 8.4 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 14°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 h 24 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Sylvan Lake's 2nd-clearest and 10th-windiest month. For the whole year in context, see Sylvan Lake's year-round climate.

Daytime high
17°
4th warmest
Overnight low
9th coldest
Precipitation
43 mm
8.4 wet days
Daylight
12 h 24 min
6:19 AM – 6:43 PM
Cloud cover
55%
2nd clearest
Wind
10 km/h
10th windiest
Solar energy
3.89 kWh/m²
Travel score
5.4
out of 10

Sylvan Lake is town in Alberta, Canada.

Density
748/km²
people per km²
Founded
1946

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 19°C in the first days to 14°C by the end.

A typical September day in Sylvan Lake reaches about 17°C in the afternoon and slips back to 5°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 24°C. Set against its neighbours, September runs about 5°C cooler than August and about 7°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
1197
2197
3197
4197
5186
6186
7186
8186
9186
10176
11175
12175
13175
14175
15165
16165
17164
18164
19164
20164
21164
22154
23153
24153
25153
26153
27143
28143
29142
30142

How September really feels in Sylvan Lake

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 4 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
4
wind chill below the day's low

The story in September is cold — wind chill drags the overnight "feels like" below the raw low.

Sylvan Lake weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-5° / -15°174.95.980.0
Feb-3° / -13°113.34.59.50.0
Mar / -8°205.55.411.50.0
Apr10° / -2°337.4413.62.1
May16° / 6310.11.815.44.7
Jun19° / 9114.3016.45.4
Jul22° / 10°8413.20166.2
Aug21° / 6810.3014.56.6
Sep17° / 438.40.712.45.4
Oct / -1°2562.510.32.1
Nov / -8°215.55.38.50.0
Dec-4° / -13°154.75.57.50.0

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 17% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35446
45446
55347
65347
75248
85248
95149
105149
115149
125149
135050
145050
155050
165149
175149
185248
195347
205248
215347
225347
235347
245347
255347
265347
275347
285347
295347
305248

Chance of precipitation in September

Any precipitationSnow

Sylvan Lake gets around 43 mm of rain and snow over 8.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 28% and peaks near 31% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202530
Rain chance (%)Snow chance (%)
1291
2291
3291
4301
5301
6301
7301
8312
9312
10312
11312
12313
13313
14303
15303
16293
17283
18283
19273
20273
21263
22263
23263
24254
25254
26254
27254
28244
29244
30245

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over September. Sunrise moves from 5:53 AM to 6:43 AM, and sunset from 7:19 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:537:19
213.45:557:17
313.35:567:14
413.25:587:12
513.26:007:09
613.16:027:07
713.06:037:05
813.06:057:02
912.96:077:00
1012.86:086:57
1112.76:106:55
1212.76:126:52
1312.66:146:50
1412.56:156:48
1512.56:176:45
1612.46:196:43
1712.36:206:40
1812.36:226:38
1912.26:246:35
2012.16:266:33
2112.16:276:30
2212.06:296:28
2311.96:316:25
2411.86:326:23
2511.86:346:21
2611.76:366:18
2711.66:386:16
2811.66:396:13
2911.56:416:11
3011.46:436:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.89 kWh/m².

For context, solar energy here swings from a low near 0.94 kWh/m² to a high of 6.37 kWh/m² in July across the year — September's 3.89 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.5Bright
54.4Bright
64.4Bright
74.3Bright
84.3Bright
94.2Bright
104.1Bright
114.1Bright
124.0Bright
134.0Moderate
143.9Moderate
153.9Moderate
163.8Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.6Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.4Moderate
273.4Moderate
283.3Moderate
293.3Moderate
303.2Moderate
Planning a trip in September

Is September a good time to visit Sylvan Lake?

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

5.4
Sightseeing
3rd-best month of the year
1.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sylvan Lake for sightseeing.

What to pack for Sylvan Lake in September

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

In September, Sylvan Lake sees daytime highs around 17°C and nights near 5°C. Worth packing: a warm layer and rain gear. About 8 days see rain.

a warm layerrain gear

UV index in Sylvan Lake in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sylvan Lake peaks around July 15 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighModerateLowJul 15UV 7Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul7Very high
Aug5Moderate
Sep3Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Sylvan Lake 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 Sylvan Lake is worst in August — around 19 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (October, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1118 µg/m³Oct 217 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb8Good
Mar11Good
Apr9Good
May12Good
Jun11Good
Jul17Moderate
Aug19Moderate
Sep11Good
Oct7Good
Nov8Good
Dec8Good
Location & terrain

Where is Sylvan Lake?

Sylvan Lake sits at 52.3°N, 114.1°W, 940 m above sea level, in Canada. The nearest listed city is Red Deer, 20 km away.

Topography around Sylvan Lake

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

Within 3 km, the terrain around Sylvan Lake has only modest variations in elevation — a maximum elevation change of 69 m around an average of 950 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 186 m; within 80 km, large variations in elevation — a maximum elevation change of 645 m.

The land around Sylvan Lake is covered by grassland (31%) and water (24%) within 3 km, cropland (51%) and grassland (31%) within 16 km, and grassland (37%), cropland (36%) and trees (24%) within 80 km.

3 km
69 m
16 km
186 m
80 km
645 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Red Deer 20 km · Leduc 112 km · Airdrie 112 km · Camrose 115 km · Coventry Hills 127 km · Evanston 128 km · Cochrane 128 km · Panorama Hills 129 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 Sylvan Lake (52.311°, -114.0837°, elevation 940 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. 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).