Duncan weather in September

In September, Duncan sees average daytime highs of 19°C and overnight lows near 10°C, with 66 mm of rain across 8.7 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 17°C by the end. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Duncan's 3rd-clearest and 11th-windiest month. For the whole year in context, see Duncan's year-round climate.

Daytime high: 19°; 3rd warmest
Overnight low: 10°; 10th coldest
Rainfall: 66 mm; 8.7 wet days
Daylight: 12 h 24 min; 5:59 AM – 6:20 PM
Cloud cover: 49%; 3rd clearest
Wind: 5 km/h; 11th windiest
Solar energy: 4.13 kWh/m²
Travel score: 6.5; out of 10

Duncan is city in British Columbia, Canada.

Air quality: Good; PM2.5 7.5 µg/m³ · 2019
Density: 10,724/km²; people per km²
Founded: 1912

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Duncan year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 17°C by the end.

A typical September day in Duncan reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 25°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	21	21	21	21	21	21	21	21	20	20	20	20	20	20	19	19	19	19	19	19	19	18	18	18	18	18	17	17	17	17
Avg low (°C)	12	11	11	11	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10	10	9	9	9	9	9	9	9	8

	Avg high (°C)	Avg low (°C)
1	21	12
2	21	11
3	21	11
4	21	11
5	21	11
6	21	11
7	21	11
8	21	11
9	20	11
10	20	11
11	20	11
12	20	11
13	20	11
14	20	10
15	19	10
16	19	10
17	19	10
18	19	10
19	19	10
20	19	10
21	19	10
22	18	10
23	18	9
24	18	9
25	18	9
26	18	9
27	17	9
28	17	9
29	17	9
30	17	8

How September really feels in Duncan

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

heat index over the day's high

Days feeling ≤ 0°C

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.

Duncan weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	5° / 0°	213	17.8	7.1	8.5	0.1
Feb	7° / 1°	133	14.4	6.3	9.8	0.7
Mar	9° / 2°	157	17.4	6.6	11.6	1.4
Apr	12° / 4°	110	15.6	1.7	13.4	2.8
May	16° / 8°	70	11.4	0.1	15	5.0
Jun	19° / 10°	52	9.3	0	15.9	6.2
Jul	23° / 13°	27	5	0	15.5	7.8
Aug	23° / 13°	39	5.1	0	14.2	7.9
Sep	19° / 10°	66	8.7	0	12.4	6.5
Oct	13° / 6°	140	13.7	0.2	10.5	3.4
Nov	8° / 3°	212	18.1	3.8	9	1.0
Dec	5° / 0°	210	17.7	8.6	8.1	0.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% 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 43%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	56	57	57	57	59	59	58	59	59	58	58	58	58	57	57	58	57	57	58	57	57	57	57	58	58	57	57	56	55	53
Cloudier (%)	44	43	43	43	41	41	42	41	41	42	42	42	42	43	43	42	43	43	42	43	43	43	43	42	42	43	43	44	45	47

	Clearer (%)	Cloudier (%)
1	56	44
2	57	43
3	57	43
4	57	43
5	59	41
6	59	41
7	58	42
8	59	41
9	59	41
10	58	42
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	58	42
17	57	43
18	57	43
19	58	42
20	57	43
21	57	43
22	57	43
23	57	43
24	58	42
25	58	42
26	57	43
27	57	43
28	56	44
29	55	45
30	53	47

Chance of precipitation in September

Any precipitation

Duncan gets around 66 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 32% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	23	23	24	24	25	25	26	26	27	28	29	30	30	30	31	31	31	32	32	32	32	32	32	32	31	31	31	31	31	32

	Rain chance (%)
1	23
2	23
3	24
4	24
5	25
6	25
7	26
8	26
9	27
10	28
11	29
12	30
13	30
14	30
15	31
16	31
17	31
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	31
26	31
27	31
28	31
29	31
30	32

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 93% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	90	90	90	90	91	91	91	92	92	92	92	92	92	92	92	92	92	93	93	93	94	94	95	95	96	96	97	97	98	98
Comfortable (%)	10	10	10	10	9	9	9	8	8	8	8	8	8	8	8	8	8	7	7	7	6	6	5	5	4	4	3	3	2	2

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	90	10
4	90	10
5	91	9
6	91	9
7	91	9
8	92	8
9	92	8
10	92	8
11	92	8
12	92	8
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	93	7
19	93	7
20	93	7
21	94	6
22	94	6
23	95	5
24	95	5
25	96	4
26	96	4
27	97	3
28	97	3
29	98	2
30	98	2

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 18 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 108 minutes over September. Sunrise moves from 5:37 AM to 6:19 AM, and sunset from 6:52 PM to 5:49 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	13.3	13.2	13.1	13.1	13.0	13.0	12.9	12.8	12.8	12.7	12.7	12.6	12.5	12.5	12.4	12.4	12.3	12.2	12.2	12.1	12.0	12.0	11.9	11.9	11.8	11.7	11.7	11.6	11.6	11.5
Sunrise (AM)	5:37	5:38	5:40	5:41	5:42	5:44	5:45	5:47	5:48	5:50	5:51	5:53	5:54	5:56	5:57	5:59	6:00	6:01	6:03	6:04	6:06	6:07	6:09	6:10	6:12	6:13	6:15	6:16	6:18	6:19
Sunset (PM)	6:52	6:50	6:48	6:46	6:44	6:42	6:39	6:37	6:35	6:33	6:31	6:29	6:26	6:24	6:22	6:20	6:18	6:15	6:13	6:11	6:09	6:06	6:04	6:02	6:00	5:58	5:55	5:53	5:51	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.3	5:37	6:52
2	13.2	5:38	6:50
3	13.1	5:40	6:48
4	13.1	5:41	6:46
5	13.0	5:42	6:44
6	13.0	5:44	6:42
7	12.9	5:45	6:39
8	12.8	5:47	6:37
9	12.8	5:48	6:35
10	12.7	5:50	6:33
11	12.7	5:51	6:31
12	12.6	5:53	6:29
13	12.5	5:54	6:26
14	12.5	5:56	6:24
15	12.4	5:57	6:22
16	12.4	5:59	6:20
17	12.3	6:00	6:18
18	12.2	6:01	6:15
19	12.2	6:03	6:13
20	12.1	6:04	6:11
21	12.0	6:06	6:09
22	12.0	6:07	6:06
23	11.9	6:09	6:04
24	11.9	6:10	6:02
25	11.8	6:12	6:00
26	11.7	6:13	5:58
27	11.7	6:15	5:55
28	11.6	6:16	5:53
29	11.6	6:18	5:51
30	11.5	6:19	5:49

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 0.83 kWh/m² to a high of 6.62 kWh/m² in July across the year — September's 4.13 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.9	4.8	4.8	4.7	4.7	4.6	4.6	4.5	4.5	4.4	4.4	4.3	4.3	4.2	4.1	4.1	4.0	3.9	3.9	3.8	3.8	3.7	3.7	3.6	3.5	3.5	3.4	3.4	3.3	3.3
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.9	Bright
2	4.8	Bright
3	4.8	Bright
4	4.7	Bright
5	4.7	Bright
6	4.6	Bright
7	4.6	Bright
8	4.5	Bright
9	4.5	Bright
10	4.4	Bright
11	4.4	Bright
12	4.3	Bright
13	4.3	Bright
14	4.2	Bright
15	4.1	Bright
16	4.1	Bright
17	4.0	Bright
18	3.9	Moderate
19	3.9	Moderate
20	3.8	Moderate
21	3.8	Moderate
22	3.7	Moderate
23	3.7	Moderate
24	3.6	Moderate
25	3.5	Moderate
26	3.5	Moderate
27	3.4	Moderate
28	3.4	Moderate
29	3.3	Moderate
30	3.3	Moderate

Planning a trip in September

Hazard calendar for Duncan

In seasonPeak

None of Duncan's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Duncan's rainy season runs October–April, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Duncan?

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

6.5

Sightseeing

3rd-best month of the year

2.9

Beach & pool

3rd-best month of the year

September is a reasonable time to visit Duncan for sightseeing.

What to pack for Duncan in September

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

In September, Duncan sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Duncan in September

The nearest coast averages about 14°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 26 km away) is warmest in August at about 16°C and coldest in January near 7°C.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	7	7	8	10	12	14	16	16	14	11	9	8
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Cool	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	7	Bracing
Feb	7	Bracing
Mar	8	Bracing
Apr	10	Bracing
May	12	Bracing
Jun	14	Bracing
Jul	16	Cool
Aug	16	Cool
Sep	14	Bracing
Oct	11	Bracing
Nov	9	Bracing
Dec	8	Bracing

UV index in Duncan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Duncan peaks around July 18 at about 8 (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 7 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	1	4	5	7	6	8	6	4	3	1	1
Level	Low	Low	Moderate	Moderate	High	High	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	1	Low
Mar	4	Moderate
Apr	5	Moderate
May	7	High
Jun	6	High
Jul	8	Very high
Aug	6	High
Sep	4	Moderate
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Location & terrain

Where is Duncan?

Duncan sits at 48.8°N, 123.7°W, 14 m above sea level, in Canada. The nearest listed city is North Cowichan, 7.0 km away.

Topography around Duncan

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

Within 3 km, the terrain around Duncan has only modest variations in elevation — a maximum elevation change of 113 m around an average of 35 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,155 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,571 m.

The land around Duncan is covered by trees (54%) and grassland (21%) within 3 km, trees (73%) within 16 km, and water (48%) and trees (45%) within 80 km.

3 km

113 m

trees 54%

16 km

1,155 m

trees 73%

80 km

1,571 m

water 48%

treesgrasslandcroplandartificial surfacesbare terrainwater

← August Duncan year-round climate October →Best places to visit in September

September weather nearby: North Cowichan 7.0 km · Central Saanich 32 km · Saanich 36 km · Langford 40 km · Carey 41 km · Colwood 42 km · Gordon Head 44 km · Esquimalt 44 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

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 Duncan (48.7829°, -123.7027°, elevation 14 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).

	Avg high (°C)	Avg low (°C)
1	21	12
2	21	11
3	21	11
4	21	11
5	21	11
6	21	11
7	21	11
8	21	11
9	20	11
10	20	11
11	20	11
12	20	11
13	20	11
14	20	10
15	19	10
16	19	10
17	19	10
18	19	10
19	19	10
20	19	10
21	19	10
22	18	10
23	18	9
24	18	9
25	18	9
26	18	9
27	17	9
28	17	9
29	17	9
30	17	8

	Clearer (%)	Cloudier (%)
1	56	44
2	57	43
3	57	43
4	57	43
5	59	41
6	59	41
7	58	42
8	59	41
9	59	41
10	58	42
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	58	42
17	57	43
18	57	43
19	58	42
20	57	43
21	57	43
22	57	43
23	57	43
24	58	42
25	58	42
26	57	43
27	57	43
28	56	44
29	55	45
30	53	47

	Rain chance (%)
1	23
2	23
3	24
4	24
5	25
6	25
7	26
8	26
9	27
10	28
11	29
12	30
13	30
14	30
15	31
16	31
17	31
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	31
26	31
27	31
28	31
29	31
30	32

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	90	10
4	90	10
5	91	9
6	91	9
7	91	9
8	92	8
9	92	8
10	92	8
11	92	8
12	92	8
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	93	7
19	93	7
20	93	7
21	94	6
22	94	6
23	95	5
24	95	5
25	96	4
26	96	4
27	97	3
28	97	3
29	98	2
30	98	2

	Avg high (°C)	Avg low (°C)
1	21	12
2	21	11
3	21	11
4	21	11
5	21	11
6	21	11
7	21	11
8	21	11
9	20	11
10	20	11
11	20	11
12	20	11
13	20	11
14	20	10
15	19	10
16	19	10
17	19	10
18	19	10
19	19	10
20	19	10
21	19	10
22	18	10
23	18	9
24	18	9
25	18	9
26	18	9
27	17	9
28	17	9
29	17	9
30	17	8

	Clearer (%)	Cloudier (%)
1	56	44
2	57	43
3	57	43
4	57	43
5	59	41
6	59	41
7	58	42
8	59	41
9	59	41
10	58	42
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	58	42
17	57	43
18	57	43
19	58	42
20	57	43
21	57	43
22	57	43
23	57	43
24	58	42
25	58	42
26	57	43
27	57	43
28	56	44
29	55	45
30	53	47

	Rain chance (%)
1	23
2	23
3	24
4	24
5	25
6	25
7	26
8	26
9	27
10	28
11	29
12	30
13	30
14	30
15	31
16	31
17	31
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	31
26	31
27	31
28	31
29	31
30	32

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	90	10
4	90	10
5	91	9
6	91	9
7	91	9
8	92	8
9	92	8
10	92	8
11	92	8
12	92	8
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	93	7
19	93	7
20	93	7
21	94	6
22	94	6
23	95	5
24	95	5
25	96	4
26	96	4
27	97	3
28	97	3
29	98	2
30	98	2

	Avg high (°C)	Avg low (°C)
1	21	12
2	21	11
3	21	11
4	21	11
5	21	11
6	21	11
7	21	11
8	21	11
9	20	11
10	20	11
11	20	11
12	20	11
13	20	11
14	20	10
15	19	10
16	19	10
17	19	10
18	19	10
19	19	10
20	19	10
21	19	10
22	18	10
23	18	9
24	18	9
25	18	9
26	18	9
27	17	9
28	17	9
29	17	9
30	17	8

	Clearer (%)	Cloudier (%)
1	56	44
2	57	43
3	57	43
4	57	43
5	59	41
6	59	41
7	58	42
8	59	41
9	59	41
10	58	42
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	58	42
17	57	43
18	57	43
19	58	42
20	57	43
21	57	43
22	57	43
23	57	43
24	58	42
25	58	42
26	57	43
27	57	43
28	56	44
29	55	45
30	53	47

	Rain chance (%)
1	23
2	23
3	24
4	24
5	25
6	25
7	26
8	26
9	27
10	28
11	29
12	30
13	30
14	30
15	31
16	31
17	31
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	31
26	31
27	31
28	31
29	31
30	32

	Dry (%)	Comfortable (%)
1	90	10
2	90	10
3	90	10
4	90	10
5	91	9
6	91	9
7	91	9
8	92	8
9	92	8
10	92	8
11	92	8
12	92	8
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	93	7
19	93	7
20	93	7
21	94	6
22	94	6
23	95	5
24	95	5
25	96	4
26	96	4
27	97	3
28	97	3
29	98	2
30	98	2