Duncan in Summer
In summer (June, July and August), Duncan sees average daytime highs around 22°C and overnight lows near 12°C, with 118 mm of rain over about 19 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 18°C in early June to 22°C by late August. The sky is clear or mostly clear about 36% of the time across summer, and the air most often feels dry.
Summer is Duncan's best season of the year to visit on our travel score. For the whole year in context, see Duncan's year-round climate.
- Avg daytime high
- 22°C
- warmest season of the year
- Avg overnight low
- 12°C
- Rainfall
- 118 mm
- 19 wet days
- Avg wind
- 6 km/h
- Travel score
- 7.3
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Duncan in Summer
Over the season highs climb from about 18°C in early June to 22°C by late August.
A typical summer day in Duncan reaches about 22°C and drops to 12°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Duncan
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer 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 the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| 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 Summer
The sky is clear or mostly clear about 36% of the time across summer.
Chance of precipitation in Summer
Duncan gets around 118 mm of rain over 19 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 6 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 h 36 min in early June to 13 h 18 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.2 kWh/m².
Hazard calendar for Duncan
None of Duncan's seasonal hazards peak in summer. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
Duncan's rainy season runs October–April, when most of the year's rain falls.
Is summer a good time to visit Duncan?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is one of the better times to visit Duncan for general sightseeing.
What to pack for Duncan in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Duncan sees daytime highs around 22°C and nights near 12°C. Pack sun protection. Worth having: light clothes and rain gear. About 19 days see rain.
Sea temperature near Duncan in Summer
The nearest coast averages about 15°C across summer — 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 Summer
Clear-sky midday UV across summer averages around 7 — 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 |
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.
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.