Stony Plain weather in September

In September, Stony Plain sees average daytime highs of 16°C and overnight lows near 5°C, with 39 mm of precipitation across 7.6 wet days and about 12.5 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 33% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Stony Plain's 2nd-clearest and 6th-windiest month. For the whole year in context, see Stony Plain's year-round climate.

Daytime high
16°
4th warmest
Overnight low
9th coldest
Precipitation
39 mm
7.6 wet days
Daylight
12 h 24 min
6:18 AM – 6:43 PM
Cloud cover
56%
2nd clearest
Wind
11 km/h
6th windiest
Solar energy
3.72 kWh/m²
Travel score
5.5
out of 10

Stony Plain is town in Alberta.

Density
504/km²
people per km²
Founded
1907

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 Stony Plain reaches about 16°C in the afternoon and slips back to 5°C overnight — a 11°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)
1198
2197
3197
4197
5187
6187
7187
8186
9186
10176
11176
12176
13175
14175
15175
16165
17165
18165
19164
20164
21164
22154
23154
24154
25154
26153
27143
28143
29143
30143

How September really feels in Stony Plain

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 3 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
3
wind chill below the day's low

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

Stony Plain 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-7° / -15°195.66.27.80.0
Feb-4° / -13°123.44.49.40.0
Mar / -9°175.3511.50.0
Apr10° / -2°326.6313.72.1
May16° / 558.50.915.65.1
Jun20° / 8713.6016.75.6
Jul22° / 11°9213.3016.36.3
Aug21° / 10°6010.2014.66.6
Sep16° / 397.60.312.55.5
Oct / -1°246.2210.32.0
Nov-1° / -8°235.95.48.30.0
Dec-6° / -14°154.85.57.30.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25248
35149
45149
55149
65149
75149
85050
95050
105050
115050
125050
135149
145248
155248
165248
175248
185347
195347
205446
215446
225446
235545
245446
255446
265446
275446
285347
295347
305248

Chance of precipitation in September

Any precipitationSnow

Stony Plain gets around 39 mm of rain and snow over 7.6 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 26% and peaks near 30% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)Snow chance (%)
1300
2301
3301
4301
5301
6301
7301
8301
9291
10291
11291
12282
13282
14282
15271
16261
17251
18241
19241
20231
21231
22221
23221
24221
25221
26211
27211
28212
29212
30212

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 (%)
1982
2982
3982
4982
5991
6991
7991
8991
9991
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000

Wind in September

Winds average 11 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
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 30 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 126 minutes over September. Sunrise moves from 5:51 AM to 6:43 AM, and sunset from 7:21 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:517:21
213.45:537:18
313.45:547:16
413.35:567:13
513.25:587:11
613.16:007:08
713.16:027:06
813.06:037:03
912.96:057:01
1012.96:076:58
1112.86:096:56
1212.76:116:53
1312.66:126:51
1412.66:146:48
1512.56:166:45
1612.46:186:43
1712.36:206:40
1812.36:216:38
1912.26:236:35
2012.16:256:33
2112.16:276:30
2212.06:296:28
2311.96:306:25
2411.86:326:22
2511.86:346:20
2611.76:366:17
2711.66:386:15
2811.56:406:12
2911.56:416:10
3011.46:436:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.72 kWh/m².

For context, solar energy here swings from a low near 0.82 kWh/m² to a high of 6.23 kWh/m² in June across the year — September's 3.72 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
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
213.5Moderate
223.4Moderate
233.4Moderate
243.3Moderate
253.3Moderate
263.2Moderate
273.2Moderate
283.1Moderate
293.1Moderate
303.0Moderate
Planning a trip in September

Is September a good time to visit Stony Plain?

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

5.5
Sightseeing
4th-best month of the year
1.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Stony Plain for sightseeing.

What to pack for Stony Plain in September

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

In September, Stony Plain sees daytime highs around 16°C and nights near 5°C. Worth packing: a warm layer. About 8 days see rain.

a warm layer

UV index in Stony Plain 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 Stony Plain peaks around July 14 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 at about 0 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 14UV 7Dec 19UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May5High
Jun6High
Jul7Very high
Aug5Moderate
Sep3Moderate
Oct2Moderate
Nov1Low
Dec0Low

Air quality in Stony Plain 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 Stony Plain is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (October, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 2319 µg/m³Oct 207 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb9Good
Mar11Good
Apr10Good
May13Moderate
Jun12Good
Jul19Moderate
Aug18Moderate
Sep11Good
Oct7Good
Nov8Good
Dec10Good
Location & terrain

Where is Stony Plain?

Stony Plain sits at 53.5°N, 114.0°W, 705 m above sea level, in Canada. The nearest listed city is Spruce Grove, 6.0 km away.

Topography around Stony Plain

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

Within 3 km, the terrain around Stony Plain has only modest variations in elevation — a maximum elevation change of 44 m around an average of 707 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 159 m; within 80 km, significant variations in elevation — a maximum elevation change of 446 m.

The land around Stony Plain is covered by cropland (35%) and grassland (27%) within 3 km, cropland (37%), grassland (29%) and trees (28%) within 16 km, and cropland (34%), grassland (33%) and trees (27%) within 80 km.

3 km
44 m
16 km
159 m
80 km
446 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Spruce Grove 6.0 km · St. Albert 27 km · Wîhkwêntôwin 32 km · Edmonton 35 km · Leduc 42 km · Sherwood Park 45 km · Camrose 97 km · Sylvan Lake 136 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 Stony Plain (53.5334°, -114.002°, elevation 705 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).