Rockcliffe-Smythe weather in September

In September, Rockcliffe-Smythe sees average daytime highs of 21°C and overnight lows near 12°C, with 69 mm of rain across 8.7 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 24°C in the first days to 19°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 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 Rockcliffe-Smythe's 3rd-clearest and 8th-windiest month. For the whole year in context, see Rockcliffe-Smythe's year-round climate.

Daytime high
21°
4th warmest
Overnight low
12°
9th coldest
Rainfall
69 mm
8.7 wet days
Daylight
12 h 18 min
6:03 AM – 6:21 PM
Cloud cover
56%
3rd clearest
Wind
12 km/h
8th windiest
Solar energy
4.13 kWh/m²
Travel score
6.7
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 19°C by the end.

A typical September day in Rockcliffe-Smythe reaches about 21°C in the afternoon and slips back to 12°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12414
22414
32414
42414
52314
62314
72314
82313
92313
102313
112213
122213
132212
142212
152212
162112
172112
182111
192111
202111
212011
222011
232010
242010
251910
261910
271910
28199
29189
30189

How September really feels in Rockcliffe-Smythe

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.

Rockcliffe-Smythe 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-1° / -8°6010.27.29.10.0
Feb-0° / -8°497.86.110.20.0
Mar / -4°579.54.511.60.3
Apr11° / 7710.71.813.22.7
May18° / 7210.1014.55.5
Jun23° / 13°7710.6015.26.7
Jul26° / 16°719.7014.96.8
Aug25° / 16°668.8013.87.1
Sep21° / 12°698.7012.36.7
Oct14° / 7510.50.110.84.1
Nov / 67102.59.51.0
Dec / -4°61105.88.80.0

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 18% of September, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15644
25644
35644
45644
55545
65545
75545
85446
95446
105347
115347
125248
135248
145248
155248
165248
175149
185149
195149
205050
215050
224951
234852
244852
254753
264753
274852
284753
294654
304654

Chance of precipitation in September

Any precipitation

Rockcliffe-Smythe gets around 69 mm of rain over 8.7 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 29% and peaks near 35% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
125
226
326
427
527
628
728
829
929
1029
1129
1229
1329
1428
1528
1628
1728
1828
1928
2028
2128
2229
2329
2430
2531
2632
2733
2834
2934
3035

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1332823142
2352822142
3362721132
4382721122
5402720122
6412620112
7432619101
8452519101
946251891
1048241891
1150241881
1251231781
1352231771
1455221670
1556221660
1657221560
1758211560
1860211450
1960211450
2062211340
2164201240
2264201240
2366201130
2468191030
2568191030
267118920
277218820
287317820
297516720
307616620

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 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
111calm
211calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112light breeze
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 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 5:46 AM to 6:20 AM, and sunset from 6:49 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:466:49
213.05:476:47
313.05:486:46
412.95:506:44
512.95:516:42
612.85:526:40
712.85:536:38
812.75:546:36
912.75:556:34
1012.65:566:33
1112.65:586:31
1212.55:596:29
1312.46:006:27
1412.46:016:25
1512.36:026:23
1612.36:036:21
1712.26:056:19
1812.26:066:17
1912.16:076:15
2012.16:086:14
2112.06:096:12
2212.06:106:10
2311.96:126:08
2411.96:136:06
2511.86:146:04
2611.86:156:02
2711.76:166:00
2811.76:185:58
2911.66:195:56
3011.66:205:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.13 kWh/m².

For context, solar energy here swings from a low near 1.32 kWh/m² to a high of 6.28 kWh/m² in June across the year — September's 4.13 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.0Bright
194.0Moderate
203.9Moderate
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 Rockcliffe-Smythe?

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

6.7
Sightseeing
3rd-best month of the year
4.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Rockcliffe-Smythe for sightseeing.

What to pack for Rockcliffe-Smythe in September

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

In September, Rockcliffe-Smythe sees daytime highs around 21°C and nights near 12°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Rockcliffe-Smythe in September

The nearest coast averages about 19°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 21°C and coldest in February near 3°C.

It's comfortable for a long swim from Jul 20 to Sep 2 — about 1.5 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr4Bracing
May7Bracing
Jun15Bracing
Jul20Cool
Aug21Refreshing
Sep19Cool
Oct13Bracing
Nov8Bracing
Dec5Bracing

UV index in Rockcliffe-Smythe 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 Rockcliffe-Smythe peaks around June 21 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 21UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May6High
Jun8Very high
Jul8Very high
Aug6High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Rockcliffe-Smythe 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 Rockcliffe-Smythe is worst in May — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodMay 2021 µg/m³Dec 1010 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar18Moderate
Apr18Moderate
May22Moderate
Jun20Moderate
Jul20Moderate
Aug17Moderate
Sep17Moderate
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Rockcliffe-Smythe?

Rockcliffe-Smythe sits at 43.7°N, 79.5°W, 109 m above sea level, in Canada. The nearest listed city is Edenbridge-Humber Valley, 2.0 km away.

Topography around Rockcliffe-Smythe

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

Within 3 km, the terrain around Rockcliffe-Smythe has only modest variations in elevation — a maximum elevation change of 89 m around an average of 123 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 155 m; within 80 km, significant variations in elevation — a maximum elevation change of 516 m.

The land around Rockcliffe-Smythe is covered by artificial surfaces (56%) and trees (36%) within 3 km, artificial surfaces (51%) and water (21%) within 16 km, and trees (27%), water (27%) and cropland (25%) within 80 km.

3 km
89 m
16 km
155 m
80 km
516 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Edenbridge-Humber Valley 2.0 km · High Park North 3.0 km · Brookhaven-Amesbury 3.0 km · Weston 4.0 km · High Park-Swansea 4.0 km · Stonegate-Queensway 4.0 km · Oakwood Village 5.0 km · Dovercourt-Wallace Emerson-Junction 5.0 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 Rockcliffe-Smythe (43.6748°, -79.4944°, elevation 109 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. 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).