Bolton weather in June

In June, Bolton sees average daytime highs of 23°C and overnight lows near 12°C, with 88 mm of rain across 11.5 wet days and about 15.2 hours of daylight. It is the 3rd-warmest and 1st-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 27% of the time in June, and the air most often feels dry.

Daylight stretches from about 15 hours at the start of June to 15 h 18 min by month's end. Set against the rest of the year, June is Bolton's 4th-clearest and 9th-windiest month. For the whole year in context, see Bolton's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
88 mm
11.5 wet days
Daylight
15 h 18 min
4:41 AM – 7:57 PM
Cloud cover
60%
4th clearest
Wind
11 km/h
9th windiest
Solar energy
6.31 kWh/m²
Travel score
6.5
out of 10

Bolton is town in Caledon, Ontario, Canada.

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 Bolton reaches about 23°C in the afternoon and slips back to 12°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)
12110
22110
32211
42211
52211
62211
72211
82211
92312
102312
112312
122312
132312
142312
152413
162413
172413
182413
192413
202413
212413
222413
232514
242514
252514
262514
272514
282514
292514
302514

How June really feels in Bolton

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.

Bolton weather by month

How June compares with the rest of the year at a glance. June is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -10°569.68.79.10.0
Feb-1° / -10°477.97.210.20.0
Mar / -5°55105.611.60.3
Apr12° / 76112.613.22.8
May18° / 8111.3014.55.6
Jun23° / 12°8811.5015.26.5
Jul26° / 15°8311014.96.6
Aug25° / 14°799.7013.86.9
Sep21° / 10°729.5012.36.5
Oct13° / 73110.410.83.6
Nov / -1°6710.23.59.50.7
Dec / -6°5710.288.80.0

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% 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 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34456
44456
54456
64456
74555
84456
94456
104456
114456
124555
134555
144555
154654
164654
174555
184753
194753
204753
214852
224753
234951
244852
254951
265050
275149
285149
295248
305347

Chance of precipitation in June

Any precipitation

Bolton gets around 88 mm of rain over 11.5 wet days in June, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
238
338
438
538
638
738
838
938
1038
1138
1238
1339
1439
1539
1639
1739
1839
1939
2039
2139
2239
2338
2438
2538
2637
2737
2836
2936
3036

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 57% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
174141020
274141020
371151130
471151130
570161130
668171131
767171231
866181231
965191231
1063201331
1163201331
1261211431
1359221531
1458221541
1556231641
1655231741
1754241741
1852241851
1952241851
2050251951
2149252060
2248252060
2348252070
2447252170
2546252180
2646252180
2745252180
2845252191
29442521101
30442521101

Wind in June

Winds average 11 km/h in June.

Across June, daily wind ranges from about 11 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
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in June

DaylightNight

Daylight runs from about 15 hours at the start of June to 15 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over June. Sunrise moves from 4:46 AM to 4:45 AM, and sunset from 7:47 PM to 8:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
115.04:467:47
215.04:457:48
315.14:457:49
415.14:447:50
515.14:447:50
615.14:437:51
715.14:437:52
815.24:437:53
915.24:427:53
1015.24:427:54
1115.24:427:54
1215.24:427:55
1315.24:427:56
1415.24:417:56
1515.34:417:57
1615.34:417:57
1715.34:417:57
1815.34:417:58
1915.34:417:58
2015.34:427:58
2115.34:427:59
2215.34:427:59
2315.34:427:59
2415.34:427:59
2515.34:438:00
2615.34:438:00
2715.34:438:00
2815.34:448:00
2915.34:448:00
3015.34:458:00

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 6.31 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.27 kWh/m² to a high of 6.31 kWh/m² in June across the year — June's 6.31 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.2Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
Planning a trip in June

Is June a good time to visit Bolton?

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

6.5
Sightseeing
3rd-best month of the year
5.2
Beach & pool
3rd-best month of the year

June is a reasonable time to visit Bolton for sightseeing.

What to pack for Bolton in June

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

In June, Bolton sees daytime highs around 23°C and nights near 12°C. Pack sun protection. Worth having: light clothes and rain gear. About 12 days see rain.

sun protectionlight clothesrain gear

Sea temperature near Bolton in June

The nearest coast averages about 15°C in June — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 41 km away) is warmest in August at about 21°C and coldest in February near 3°C.

It's comfortable for a long swim from Jul 20 to Sep 2 — about 1.5 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr4Bracing
May7Bracing
Jun15Bracing
Jul20Cool
Aug21Refreshing
Sep19Cool
Oct13Bracing
Nov8Bracing
Dec5Bracing

UV index in Bolton in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bolton peaks around June 22 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 22UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May6High
Jun8Very high
Jul8Very high
Aug6High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Bolton in June

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where June falls, not just the annual average.

Air quality in Bolton is worst in May — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (November, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMay 2019 µg/m³Nov 239 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar16Moderate
Apr17Moderate
May19Moderate
Jun18Moderate
Jul18Moderate
Aug16Moderate
Sep14Moderate
Oct10Good
Nov9Good
Dec9Good
Location & terrain

Where is Bolton?

Bolton sits at 43.9°N, 79.7°W, 221 m above sea level, in Canada. The nearest listed city is Mount Olive-Silverstone-Jamestown, 19 km away.

Topography around Bolton

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

Within 3 km, the terrain around Bolton has only modest variations in elevation — a maximum elevation change of 83 m around an average of 249 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 323 m; within 80 km, significant variations in elevation — a maximum elevation change of 473 m.

The land around Bolton is covered by trees (37%) and artificial surfaces (29%) within 3 km, trees (35%), cropland (27%) and grassland (25%) within 16 km, and trees (30%), cropland (29%) and water (21%) within 80 km.

3 km
83 m
16 km
323 m
80 km
473 m
treesgrasslandcroplandartificial surfacesbare terrainwater
June weather nearby: Mount Olive-Silverstone-Jamestown 19 km · Vaughan 20 km · Caledon 21 km · Humbermede 21 km · West Humber-Clairville 21 km · Black Creek 22 km · Brampton 22 km · Glenfield-Jane Heights 23 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 Bolton (43.8795°, -79.7379°, elevation 221 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).