Cornwall weather in June

In June, Cornwall sees average daytime highs of 24°C and overnight lows near 13°C, with 105 mm of rain across 12.4 wet days and about 15.4 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 22°C in the first days to 25°C by the end. The sky is clear or mostly clear about 22% of the time in June, and the air most often feels dry.

Daylight stretches from about 15 h 12 min at the start of June to 15 h 24 min by month's end. Set against the rest of the year, June is Cornwall's 4th-clearest and 10th-windiest month. For the whole year in context, see Cornwall's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
13°
10th coldest
Rainfall
105 mm
12.4 wet days
Daylight
15 h 24 min
4:17 AM – 7:41 PM
Cloud cover
64%
4th clearest
Wind
10 km/h
10th windiest
Solar energy
5.91 kWh/m²
Travel score
6.3
out of 10

Cornwall is city in Ontario, Canada.

Air quality
Good
PM2.5 6 µg/m³ · 2019
Density
793/km²
people per km²
Founded
1784

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

Temperature in June

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 22°C in the first days to 25°C by the end.

A typical June day in Cornwall reaches about 24°C in the afternoon and slips back to 13°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 30°C. Set against its neighbours, June runs about 5°C warmer than May and about 2°C cooler than July.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12111
22211
32211
42211
52211
62212
72212
82312
92312
102312
112312
122313
132313
142413
152413
162413
172413
182414
192414
202514
212514
222514
232514
242514
252514
262515
272515
282515
292515
302515

How June really feels in Cornwall

Once humidity and wind are folded in, June 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

June sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Cornwall weather by month

How June compares with the rest of the year at a glance. June is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-4° / -12°7311.410.590.0
Feb-2° / -12°61108.710.10.0
Mar / -6°7611.2711.60.2
Apr12° / 10112.12.813.22.8
May19° / 9812.20.114.65.6
Jun24° / 13°10512.4015.46.3
Jul26° / 16°10012.9015.16.2
Aug25° / 15°9411.6013.96.6
Sep21° / 11°9310.5012.36.4
Oct13° / 105120.610.73.6
Nov / -1°8412.43.79.30.6
Dec-0° / -7°8212.49.38.60.0

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 19% of June, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33664
43664
53763
63763
73763
83763
93961
104060
114060
124159
134159
144258
154357
164357
174357
184357
194456
204456
214456
224456
234456
244555
254555
264555
274456
284555
294555
304555

Chance of precipitation in June

Any precipitation

Cornwall gets around 105 mm of rain over 12.4 wet days in June. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 40% and peaks near 43% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
143
243
343
442
542
641
741
840
940
1039
1139
1238
1338
1438
1538
1638
1738
1838
1939
2039
2140
2240
2341
2441
2541
2642
2742
2842
2943
3043

Humidity in June

DryComfortableHumidMuggyOppressiveMiserable

Most of June feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, June lands in the dry band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
171151130
270161130
368171140
467181140
567181140
664191151
763201151
861211251
960221251
1060221251
1157231361
1256231461
1354231571
1452241671
1551241681
1649241781
1748241891
1846251991
19442520101
20432520111
21412521111
22392622121
23382622131
24362723131
25352723141
26332724142
27322824152
28312824152
29302824152
30292824163

Wind in June

Winds average 10 km/h in June.

Across June, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in June

DaylightNight

Daylight runs from about 15 h 12 min at the start of June to 15 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over June. Sunrise moves from 4:22 AM to 4:20 AM, and sunset from 7:31 PM to 7:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
115.24:227:31
215.24:217:32
315.24:217:33
415.24:207:34
515.24:207:34
615.34:197:35
715.34:197:36
815.34:197:37
915.34:187:37
1015.34:187:38
1115.34:187:39
1215.44:187:39
1315.44:177:40
1415.44:177:40
1515.44:177:41
1615.44:177:41
1715.44:177:42
1815.44:177:42
1915.44:177:42
2015.44:177:43
2115.44:177:43
2215.44:187:43
2315.44:187:43
2415.44:187:44
2515.44:187:44
2615.44:197:44
2715.44:197:44
2815.44:197:44
2915.44:207:44
3015.44:207:44

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 5.91 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.2 kWh/m² to a high of 5.91 kWh/m² in June across the year — June's 5.91 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.9Bright
125.9Bright
135.9Bright
146.0Bright
156.0Bright
166.0Intense
176.0Intense
186.0Intense
196.1Intense
206.1Intense
216.1Intense
226.1Intense
236.1Intense
246.1Intense
256.1Intense
266.1Intense
276.1Intense
286.1Intense
296.0Intense
306.0Intense
Planning a trip in June

Is June a good time to visit Cornwall?

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

6.3
Sightseeing
3rd-best month of the year
5.2
Beach & pool
3rd-best month of the year

June is a reasonable time to visit Cornwall for sightseeing.

What to pack for Cornwall in June

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

In June, Cornwall sees daytime highs around 24°C and nights near 13°C. Worth packing: light clothes, rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Cornwall in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cornwall peaks around July 14 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 10 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highModerateModerateLowJul 14UV 8Jan 10UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Cornwall?

Cornwall sits at 45.0°N, 74.7°W, 59 m above sea level, in Canada. The nearest listed city is Les Coteaux, 49 km away.

Topography around Cornwall

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

Within 3 km, the terrain around Cornwall has only modest variations in elevation — a maximum elevation change of 40 m around an average of 58 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, large variations in elevation — a maximum elevation change of 1,164 m.

The land around Cornwall is covered by trees (35%) and artificial surfaces (26%) within 3 km, trees (51%) within 16 km, and trees (58%) and cropland (28%) within 80 km.

3 km
40 m
16 km
100 m
80 km
1,164 m
treesgrasslandcroplandartificial surfaceswaterwetland
June weather nearby: Les Coteaux 49 km · Salaberry-de-Valleyfield 53 km · Saint-Lazare 63 km · Vaudreuil-Dorion 69 km · Clarence-Rockland 74 km · Orléans 78 km · Fallingbrook 78 km · Gloucester 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
Christian 53%none 35%Muslim 5%Hindu 2%

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 Cornwall (45.0181°, -74.7281°, elevation 59 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. 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).