Bolton weather in July

In July, Bolton sees average daytime highs of 26°C and overnight lows near 15°C, with 83 mm of rain across 11 wet days and about 14.9 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 30% of the time in July, and the air most often feels dry.

Daylight stretches from about 15 h 12 min at the start of July to 14 h 30 min by month's end. Set against the rest of the year, July is Bolton's 1st-clearest and 11th-windiest month. For the whole year in context, see Bolton's year-round climate.

Daytime high
26°
1st warmest
Overnight low
15°
12th coldest
Rainfall
83 mm
11 wet days
Daylight
15 hours
4:55 AM – 7:54 PM
Cloud cover
56%
1st clearest
Wind
10 km/h
11th windiest
Solar energy
6.2 kWh/m²
Travel score
6.6
out of 10

Bolton is town in Caledon, Ontario, Canada.

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical July day in Bolton reaches about 26°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 31°C. Set against its neighbours, July runs about 2°C warmer than June and about 1°C warmer than August.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12514
22514
32514
42514
52614
62615
72615
82615
92615
102615
112615
122615
132615
142615
152615
162615
172615
182615
192615
202615
212615
222615
232615
242615
252615
262615
272615
282615
292615
302615
312615

How July really feels in Bolton

Once humidity and wind are folded in, July 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

July 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 July compares with the rest of the year at a glance. July is the 1st-warmest and 2nd-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 July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in July, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 24% of July, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25446
35446
45545
55644
65644
75743
85743
95743
105743
115743
125644
135644
145545
155545
165446
175446
185446
195347
205347
215347
225347
235347
245248
255248
265248
275248
285248
295248
305347
315347

Chance of precipitation in July

Any precipitation

Bolton gets around 83 mm of rain over 11 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
434
534
634
734
834
934
1034
1134
1235
1335
1435
1535
1636
1736
1836
1937
2037
2137
2238
2338
2438
2538
2638
2738
2838
2937
3037
3137

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the dry band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 15% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1432521101
2432521111
3432521111
4422521111
5422521111
6412521121
7412621121
8402621121
9392622131
10382622131
11362623141
12352623142
13342624142
14332624142
15322725142
16322725142
17312825142
18302825142
19292926142
20292926142
21283026142
22273026142
23273125142
24273225142
25273225142
26263325142
27263425142
28273424132
29273424132
30273424131
31283424131

Wind in July

Winds average 10 km/h in July.

Across July, 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.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 15 h 12 min at the start of July to 14 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over July. Sunrise moves from 4:45 AM to 5:10 AM, and sunset from 8:00 PM to 7:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.24:458:00
215.24:457:59
315.24:467:59
415.24:477:59
515.24:477:59
615.24:487:59
715.24:487:58
815.14:497:58
915.14:507:58
1015.14:507:57
1115.14:517:57
1215.14:527:56
1315.04:537:56
1415.04:547:55
1515.04:547:54
1615.04:557:54
1714.94:567:53
1814.94:577:52
1914.94:587:52
2014.94:597:51
2114.85:007:50
2214.85:017:49
2314.85:027:48
2414.75:037:47
2514.75:047:46
2614.75:057:45
2714.65:067:44
2814.65:077:43
2914.65:087:42
3014.55:097:41
3114.55:107:40

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 6.2 kWh/m².

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 — July's 6.2 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.4Intense
56.4Intense
66.4Intense
76.4Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.1Intense
196.1Intense
206.1Intense
216.1Intense
226.0Intense
236.0Intense
246.0Bright
256.0Bright
265.9Bright
275.9Bright
285.9Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in July

Is July a good time to visit Bolton?

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

6.6
Sightseeing
2nd-best month of the year
6.2
Beach & pool
1st-best month of the year

July is a reasonable time to visit Bolton for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Bolton in July

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

In July, Bolton sees daytime highs around 26°C and nights near 15°C. Pack sun protection. Worth having: light clothes and rain gear. About 11 days see rain.

sun protectionlight clothesrain gear

Sea temperature near Bolton in July

The nearest coast averages about 20°C in July — 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 July

LowModerateHighVery highExtreme

Clear-sky midday UV in July 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 July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July 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
July 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).