Cornwall, Canada — Weather in August 2026

Climate Overview

Cornwall, Canada in August has warm conditions, with highs averaging 25.4°C (78°F). Rain falls on about 13 days this month.

This month falls at the end of Summer.

Daily highs in August gradually drop from around 26°C (80°F) at the start to 23°C (74°F) by month's end.

August sees fairly even rainfall, totalling about 116 mm across the month.

Expect around 11.6h of sunshine at the start of August, decreasing to 9.5h by the end.

The warmest days tend to fall around the 10th, averaging 26.7°C (80°F).

Temperatures begin dropping heading into September.

Monthly August Averages

Temperature

25°C / 17°C

Feels Like

27°C / 18°C

Rain

13 days · 115 mm

Sunshine

10.6h / day

Humidity

76% — Humid

Wind

14 km/h

Wind Direction

SW (225°)

Gusts

34 km/h

Daylight

14 h

Cloud Cover

56%

Clear Sky Days

3.9

UV Index

5.7 — High

Dew Point

17°C — Humid

Moon Phase

Waxing Crescent · 3%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:02

Daylight 14.1h

Sunset 20:08

What to Expect

Daytime temperatures around 25°C (78°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Rain usually comes in shorter passing showers rather than all-day rain.

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	-2°C / -10°C	-7°C / -15°C	12days (80 mm) Wet	4.9h Fair	77% Humid	1.9 Low	Poor	View Details
February	0°C / -10°C	-5°C / -15°C	13days (82 mm) Wet	6h Fair	75% Muggy	2.9 Moderate	Poor	View Details
March	4°C / -5°C	0°C / -9°C	13days (90 mm) Wet	7.4h Good	72% Muggy	4 Moderate	Poor	View Details
April	11°C / 2°C	8°C / -2°C	13days (115 mm) Wet	8.3h Good	68% Muggy	4.7 Moderate	Poor	View Details
May best	19°C / 9°C	18°C / 6°C	12days (90 mm) Wet	10.2h Excellent	69% Muggy	5.6 High	Good	View Details
June best	24°C / 14°C	25°C / 13°C	13days (104 mm) Wet	10.8h Excellent	71% Muggy	6.1 High	Excellent	View Details
July best	27°C / 18°C	28°C / 18°C	12days (112 mm) Wet	11.9h Excellent	74% Muggy	6.6 High	Excellent	View Details
August best	25°C / 17°C	27°C / 18°C	13days (115 mm) Wet	10.6h Excellent	76% Humid	5.7 High	Excellent	View Details
September best	22°C / 14°C	22°C / 13°C	8days (68 mm) Wet	9.3h Good	76% Humid	4.8 Moderate	Excellent	View Details
October	15°C / 8°C	13°C / 5°C	13days (130 mm) Wet	6.6h Fair	76% Humid	3.1 Moderate	Fair	View Details
November	6°C / 0°C	3°C / -4°C	13days (92 mm) Wet	5.1h Fair	77% Humid	2 Low	Poor	View Details
December	1°C / -5°C	-3°C / -10°C	13days (90 mm) Wet	4.2h Fair	77% Humid	1.5 Low	Poor	View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaWaterproof jacketBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

Expand all

Is August a good time to visit Cornwall?

August is typically excellent for visiting Cornwall, with average highs of 25°C (78°F) and around 13 rainy days. Cornwall, Canada in August has warm conditions, with highs averaging 25.4°C (78°F). Rain falls on about 13 days this mon

Does it rain a lot in Cornwall in August?

Cornwall typically sees around 13 rainy days in August with 115 mm (4.5 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Cornwall in August?

Evenings in Cornwall during August are mild at 17°C (63°F). A light cardigan is usually enough.

What should I pack for Cornwall in August?

With highs of 25°C (78°F) and lows of 17°C (63°F) in August, we recommend: Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. Comfortable walking shoes are essential.

Is August among the best months weather-wise in Cornwall?

Yes, August offers some of the best weather conditions in Cornwall with comfortable temperatures and lower chances of rain.

What is the UV index in Cornwall in August?

The average UV index in Cornwall during August is 6 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.

How many hours of daylight are there in Cornwall in August?

Cornwall gets approximately 14 hours of daylight per day in August, with around 11 hours of sunshine.

Does it snow in Cornwall in August?

Snow is uncommon in Cornwall during August based on 10-year climate averages.

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