Belleville weather in August

In August, Belleville sees average daytime highs of 25°C and overnight lows near 15°C, with 84 mm of rain across 10.1 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 24°C by the end. The sky is clear or mostly clear about 31% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 30 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Belleville's 2nd-clearest and 12th-windiest month. For the whole year in context, see Belleville's year-round climate.

Daytime high
25°
2nd warmest
Overnight low
15°
11th coldest
Rainfall
84 mm
10.1 wet days
Daylight
13 h 48 min
5:18 AM – 7:09 PM
Cloud cover
56%
2nd clearest
Wind
10 km/h
12th windiest
Solar energy
5.49 kWh/m²
Travel score
6.8
out of 10

Belleville is city in Ontario, Canada.

Air quality
Good
PM2.5 6 µg/m³ · 2019
Density
206/km²
people per km²
Founded
1789

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 24°C by the end.

A typical August day in Belleville reaches about 25°C in the afternoon and slips back to 15°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 29°C. Set against its neighbours, August runs about 1°C cooler than July and about 4°C warmer than September.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52616
62616
72616
82616
92616
102616
112616
122616
132616
142616
152616
162515
172515
182515
192515
202515
212515
222515
232515
242515
252515
262515
272515
282514
292414
302414
312414

How August really feels in Belleville

Once humidity and wind are folded in, August 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

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

Belleville weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -11°6810.58.59.10.0
Feb-1° / -10°548.16.610.20.0
Mar / -5°66105.411.60.3
Apr12° / 9011.31.913.22.9
May19° / 7810.3014.55.8
Jun24° / 14°9011015.26.6
Jul26° / 16°8410.90156.5
Aug25° / 15°8410.1013.86.8
Sep21° / 11°849.3012.36.6
Oct14° / 8811.70.210.83.8
Nov / -1°78102.79.40.8
Dec / -6°7410.86.88.70.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 23% of August, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55446
65446
75446
85446
95545
105545
115545
125545
135545
145446
155446
165545
175545
185545
195446
205446
215446
225446
235446
245446
255446
265446
275446
285347
295446
305446
315446

Chance of precipitation in August

Any precipitation

Belleville gets around 84 mm of rain over 10.1 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
535
635
735
835
934
1034
1134
1234
1334
1434
1534
1634
1734
1833
1933
2033
2132
2232
2331
2431
2530
2630
2729
2829
2929
3028
3128

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 28% of days. Sticky, muggy-or-worse air turns up on roughly 20% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1202729203
2202728213
3202828213
4202828213
5212827213
6212827213
7212927213
8212926203
9222926203
10222926203
11222926203
12232926193
13232926193
14232926183
15242927183
16242927182
17242927172
18252927172
19252927172
20262927172
21262827162
22272827162
23282826162
24292726162
25302726152
26302725152
27312725152
28322724152
29332724142
30342723142
31352723132

Wind in August

Winds average 10 km/h in August, the calmest month.

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

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
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
3110calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 30 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over August. Sunrise moves from 5:01 AM to 5:36 AM, and sunset from 7:30 PM to 6:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:017:30
214.45:027:29
314.45:037:28
414.45:047:26
514.35:057:25
614.35:077:24
714.25:087:22
814.25:097:21
914.25:107:20
1014.15:117:18
1114.15:127:17
1214.05:137:15
1314.05:157:14
1413.95:167:12
1513.95:177:11
1613.85:187:09
1713.85:197:07
1813.85:217:06
1913.75:227:04
2013.75:237:03
2113.65:247:01
2213.65:256:59
2313.55:266:57
2413.55:286:56
2513.45:296:54
2613.45:306:52
2713.35:316:50
2813.35:326:49
2913.25:346:47
3013.25:356:45
3113.15:366:43

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.49 kWh/m².

For context, solar energy here swings from a low near 1.31 kWh/m² to a high of 6.38 kWh/m² in June across the year — August's 5.49 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.7Bright
95.7Bright
105.7Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.5Bright
165.5Bright
175.5Bright
185.4Bright
195.4Bright
205.4Bright
215.3Bright
225.3Bright
235.3Bright
245.2Bright
255.2Bright
265.2Bright
275.1Bright
285.1Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in August

Is August a good time to visit Belleville?

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

6.8
Sightseeing
1st-best month of the year
6.3
Beach & pool
2nd-best month of the year

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

What to pack for Belleville in August

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

In August, Belleville sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Belleville in August

The nearest coast averages about 22°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 21 km away) is warmest in August at about 22°C and coldest in March near 1°C.

It's comfortable for a long swim from Jul 16 to Sep 11 — about 1.9 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan3Bracing
Feb1Bracing
Mar1Bracing
Apr3Bracing
May7Bracing
Jun14Bracing
Jul20Refreshing
Aug22Refreshing
Sep20Cool
Oct15Bracing
Nov10Bracing
Dec6Bracing

UV index in Belleville in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Belleville peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 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 highHighModerateLowJul 11UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May7High
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Belleville?

Belleville sits at 44.2°N, 77.4°W, 93 m above sea level, in Canada. The nearest listed city is Quinte West, 15 km away.

Topography around Belleville

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

Within 3 km, the terrain around Belleville has only modest variations in elevation — a maximum elevation change of 38 m around an average of 88 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 194 m; within 80 km, significant variations in elevation — a maximum elevation change of 355 m.

The land around Belleville is covered by artificial surfaces (35%), water (24%) and trees (21%) within 3 km, trees (38%), grassland (25%) and cropland (21%) within 16 km, and trees (40%) and water (40%) within 80 km.

3 km
38 m
16 km
194 m
80 km
355 m
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Quinte West 15 km · Prince Edward 21 km · Greater Napanee 36 km · Cobourg 67 km · Kingston 72 km · Peterborough 76 km · Oswego 106 km · Irondequoit 107 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 Belleville (44.1668°, -77.3828°, elevation 93 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).