Oakville in Summer
In summer (June, July and August), Oakville sees average daytime highs around 24°C and overnight lows near 16°C, with 222 mm of rain over about 31 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Over the season highs climb from about 20°C in early June to 24°C by late August. The sky is clear or mostly clear about 33% of the time across summer, and the air most often feels dry.
Summer is Oakville's best season of the year to visit on our travel score. For the whole year in context, see Oakville's year-round climate.
- Avg daytime high
- 24°C
- warmest season of the year
- Avg overnight low
- 16°C
- Rainfall
- 222 mm
- 31 wet days
- Avg wind
- 11 km/h
- Travel score
- 6.8
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Oakville in Summer
Over the season highs climb from about 20°C in early June to 24°C by late August.
A typical summer day in Oakville reaches about 24°C and drops to 16°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Oakville
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.
Oakville 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 | -1° / -7° | 70 | 11 | 8.5 | 9.1 | 0.0 |
| Feb | -0° / -7° | 55 | 8.6 | 6.6 | 10.2 | 0.0 |
| Mar | 4° / -3° | 65 | 9.6 | 4.9 | 11.6 | 0.2 |
| Apr | 10° / 3° | 89 | 11.3 | 2 | 13.2 | 2.3 |
| May | 16° / 8° | 81 | 11 | 0 | 14.5 | 5.0 |
| Jun | 22° / 14° | 82 | 11.3 | 0 | 15.2 | 6.5 |
| Jul | 25° / 18° | 74 | 10.1 | 0 | 14.9 | 6.8 |
| Aug | 25° / 17° | 66 | 9.4 | 0 | 13.8 | 7.1 |
| Sep | 21° / 13° | 75 | 9.2 | 0 | 12.3 | 6.6 |
| Oct | 14° / 7° | 83 | 11.1 | 0.1 | 10.8 | 4.0 |
| Nov | 7° / 2° | 77 | 10.2 | 2.6 | 9.5 | 1.0 |
| Dec | 2° / -3° | 70 | 10.5 | 6.3 | 8.8 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 33% of the time across summer.
Chance of precipitation in Summer
Oakville gets around 222 mm of rain over 31 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 11 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 hours in early June to 13 h 06 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 5.9 kWh/m².
Is summer a good time to visit Oakville?
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 a reasonable time to visit Oakville for sightseeing.
What to pack for Oakville in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Oakville sees daytime highs around 24°C and nights near 16°C. Pack sun protection. Worth having: light clothes and rain gear. About 31 days see rain.
Sea temperature near Oakville in Summer
The nearest coast averages about 19°C across summer — 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 22 to Sep 1 — about 1.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 4 | 3 | 3 | 4 | 8 | 15 | 20 | 21 | 19 | 13 | 8 | 5 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 4 | Bracing |
| Feb | 3 | Bracing |
| Mar | 3 | Bracing |
| Apr | 4 | Bracing |
| May | 8 | Bracing |
| Jun | 15 | Cool |
| Jul | 20 | Cool |
| Aug | 21 | Refreshing |
| Sep | 19 | Cool |
| Oct | 13 | Bracing |
| Nov | 8 | Bracing |
| Dec | 5 | Bracing |
UV index in Oakville 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 Oakville 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 5 | 6 | 8 | 8 | 6 | 5 | 3 | 2 | 1 |
| Level | Low | Low | Moderate | High | High | Very high | Very high | High | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 4 | Moderate |
| Apr | 5 | High |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 5 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Oakville?
Oakville sits at 43.5°N, 79.7°W, 99 m above sea level, in Canada. The nearest listed city is Burlington, 14 km away.
Topography around Oakville
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Oakville.
Within 3 km, the terrain around Oakville has only modest variations in elevation — a maximum elevation change of 82 m around an average of 103 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 244 m; within 80 km, significant variations in elevation — a maximum elevation change of 461 m.
The land around Oakville is covered by trees (36%) and artificial surfaces (36%) within 3 km, water (44%) and artificial surfaces (20%) within 16 km, and cropland (29%), trees (25%) and water (25%) 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 Oakville (43.4501°, -79.6829°, elevation 99 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.