Cornwall, Canada — Weather in May 2027

Climate Overview

Cornwall, Canada in May has mild conditions, with highs averaging 19.1°C (66°F) and noticeably cooler mornings. Rain falls on about 12 days this month. Temperatures drop noticeably between day and night.

This month falls at the end of Spring.

Daily highs in May gradually rise from around 15°C (60°F) at the start to 23°C (73°F) by month's end.

May sees fairly even rainfall, totalling about 89 mm across the month.

Expect around 7.0h of sunshine at the start of May, increasing to 11.3h by the end.

The warmest days tend to fall around the 28th, averaging 23.1°C (74°F).

Compared to April, this month is about 8°C warmer with 1 fewer rainy days. Temperatures will rise further into June.

Monthly May Averages

Temperature

19°C / 9°C

Feels Like

18°C / 6°C

Rain

12 days · 90 mm

Sunshine

10.2h / day

Humidity

69% — Humid

Wind

16 km/h

Wind Direction

WSW (243°)

Gusts

37 km/h

Daylight

14.9 h

Cloud Cover

63%

Clear Sky Days

4.1

UV Index

5.6 — High

Dew Point

8°C — Dry

Moon Phase

Waxing Gibbous · 66%

Frost Days

1 days

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 05:31

Daylight 14.8h

Sunset 20:22

What to Expect

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.

2 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

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.

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

Packing List

Warm evening layerUmbrellaWaterproof jacketComfortable walking shoes

Frequently Asked Questions

Expand all

Is May a good time to visit Cornwall?

May is typically good for visiting Cornwall, with average highs of 19°C (66°F) and around 12 rainy days. Cornwall, Canada in May has mild conditions, with highs averaging 19.1°C (66°F) and noticeably cooler mornings. Rain fal

Does it rain a lot in Cornwall in May?

Cornwall typically sees around 12 rainy days in May with 90 mm (3.5 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Cornwall in May?

Nights in Cornwall during May are cool at around 9°C (47°F). Bring a jacket or sweater for evenings.

What should I pack for Cornwall in May?

With highs of 19°C (66°F) and lows of 9°C (47°F) in May, we recommend: Warm evening layer, Umbrella, Waterproof jacket, Comfortable walking shoes. Comfortable walking shoes are essential.

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

Yes, May 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 May?

The average UV index in Cornwall during May 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 May?

Cornwall gets approximately 15 hours of daylight per day in May, with around 10 hours of sunshine.

Does it snow in Cornwall in May?

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

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