Saint-Constant weather in August

In August, Saint-Constant sees average daytime highs of 25°C and overnight lows near 15°C, with 108 mm of rain across 12.2 wet days and about 13.9 hours of daylight. It is the 2nd-warmest and 4th-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 humid.

Daylight stretches from about 14 h 36 min at the start of August to 13 h 12 min by month's end. Set against the rest of the year, August is Saint-Constant's 1st-clearest and 12th-windiest month. For the whole year in context, see Saint-Constant's year-round climate.

Daytime high
25°
2nd warmest
Overnight low
15°
11th coldest
Rainfall
108 mm
12.2 wet days
Daylight
13 h 54 min
5:00 AM – 6:56 PM
Cloud cover
57%
1st clearest
Wind
10 km/h
12th windiest
Solar energy
5.14 kWh/m²
Travel score
6.6
out of 10

Saint-Constant is city in Montérégie, Quebec, Canada.

Density
477/km²
people per km²
Founded
1855

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 Saint-Constant 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 21°C and 29°C. Set against its neighbours, August runs about 1°C cooler than July and about 4°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52616
62616
72616
82616
92616
102616
112616
122516
132516
142516
152516
162515
172515
182515
192515
202515
212515
222515
232515
242415
252414
262414
272414
282414
292414
302414
312414

How August really feels in Saint-Constant

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.

Saint-Constant weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-5° / -13°7010.698.90.0
Feb-3° / -12°599.38.110.10.0
Mar / -6°7410.96.711.60.1
Apr11° / 10211.72.313.22.7
May19° / 10412014.65.6
Jun24° / 14°11812.6015.46.3
Jul26° / 16°11013015.16.2
Aug25° / 15°10812.2013.96.6
Sep21° / 11°9910.6012.36.3
Oct13° / 11211.90.510.73.5
Nov / -1°86123.39.30.6
Dec-1° / -8°8211.99.18.60.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 22% of August, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35446
45446
55446
65347
75347
85347
95248
105248
115248
125149
135149
145149
155248
165248
175248
185248
195248
205248
215347
225347
235446
245446
255545
265446
275446
285446
295446
305446
315446

Chance of precipitation in August

Any precipitation

Saint-Constant gets around 108 mm of rain over 12.2 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 39% and peaks near 42% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
241
341
442
542
642
742
842
942
1042
1142
1242
1341
1441
1541
1640
1739
1839
1938
2037
2137
2236
2335
2435
2535
2634
2734
2834
2934
3034
3134

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 30% 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 (%)
1162533233
2162533233
3162533233
4162534223
5162534223
6162534223
7162534223
8162634213
9172634213
10172633213
11182633203
12182633203
13192633192
14202633192
15212633182
16212633172
17222633172
18232732162
19242731162
20252731152
21262730152
22282729152
23292728152
24302727142
25322726142
26332724141
27342723141
28352822141
29362821131
30372820131
31392819131

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 11 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
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 36 min at the start of August to 13 h 12 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 4:42 AM to 5:19 AM, and sunset from 7:18 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.64:427:18
214.64:447:17
314.54:457:16
414.54:467:14
514.44:477:13
614.44:487:12
714.34:497:10
814.34:517:09
914.34:527:07
1014.24:537:06
1114.24:547:04
1214.14:567:03
1314.14:577:01
1414.04:587:00
1514.04:596:58
1613.95:006:56
1713.95:026:55
1813.85:036:53
1913.85:046:51
2013.75:056:49
2113.75:076:48
2213.65:086:46
2313.65:096:44
2413.55:106:42
2513.55:126:41
2613.45:136:39
2713.45:146:37
2813.35:156:35
2913.35:176:33
3013.25:186:31
3113.25:196:29

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.14 kWh/m².

For context, solar energy here swings from a low near 1.22 kWh/m² to a high of 5.93 kWh/m² in July across the year — August's 5.14 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.4Bright
85.4Bright
95.4Bright
105.3Bright
115.3Bright
125.3Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.1Bright
185.1Bright
195.1Bright
205.0Bright
215.0Bright
225.0Bright
234.9Bright
244.9Bright
254.9Bright
264.8Bright
274.8Bright
284.8Bright
294.7Bright
304.7Bright
314.6Bright
Planning a trip in August

Is August a good time to visit Saint-Constant?

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

6.6
Sightseeing
1st-best month of the year
5.9
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Saint-Constant for sightseeing.

What to pack for Saint-Constant in August

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

In August, Saint-Constant sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Saint-Constant in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saint-Constant peaks around July 13 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Saint-Constant?

Saint-Constant sits at 45.4°N, 73.6°W, 26 m above sea level, in Canada. The nearest listed city is Sainte-Catherine, 4.0 km away.

Topography around Saint-Constant

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

Within 3 km, the terrain around Saint-Constant has only modest variations in elevation — a maximum elevation change of 80 m around an average of 30 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 255 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,210 m.

The land around Saint-Constant is covered by artificial surfaces (30%), cropland (29%) and trees (22%) within 3 km, cropland (40%), trees (21%) and artificial surfaces (20%) within 16 km, and trees (44%) and cropland (38%) within 80 km.

3 km
80 m
16 km
255 m
80 km
1,210 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Sainte-Catherine 4.0 km · Candiac 4.0 km · La Prairie 8.0 km · Desmarchais-Crawford 9.0 km · Ville-Émard 10 km · Verdun 10 km · Ile-des-Soeurs 10 km · Saint-Henri 12 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 Saint-Constant (45.3668°, -73.5659°, elevation 26 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).