Saint-Jean-sur-Richelieu weather in August

In August, Saint-Jean-sur-Richelieu sees average daytime highs of 25°C and overnight lows near 15°C, with 108 mm of rain across 12.4 wet days and about 13.9 hours of daylight. It is the 2nd-warmest and 3rd-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 30% 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-Jean-sur-Richelieu's 1st-clearest and 12th-windiest month. For the whole year in context, see Saint-Jean-sur-Richelieu's year-round climate.

Daytime high
25°
2nd warmest
Overnight low
15°
11th coldest
Rainfall
108 mm
12.4 wet days
Daylight
13 h 54 min
4:59 AM – 6:55 PM
Cloud cover
57%
1st clearest
Wind
10 km/h
12th windiest
Solar energy
5.13 kWh/m²
Travel score
6.5
out of 10

Saint-Jean-sur-Richelieu is city in Mobtérégie, Quebec, Canada.

Air quality
Good
PM2.5 7 µg/m³ · 2019
Density
419/km²
people per km²
Founded
2001

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-Jean-sur-Richelieu 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
102516
112516
122516
132516
142515
152515
162515
172515
182515
192515
202515
212515
222515
232415
242414
252414
262414
272414
282414
292414
302414
312413

How August really feels in Saint-Jean-sur-Richelieu

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-Jean-sur-Richelieu weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-4° / -13°7111.29.88.90.0
Feb-3° / -12°609.38.210.10.0
Mar / -6°7511.46.911.60.1
Apr11° / 9911.72.313.22.7
May19° / 104120.114.65.6
Jun24° / 14°11712.8015.46.3
Jul26° / 16°10713.3015.16.2
Aug25° / 15°10812.4013.96.5
Sep21° / 11°9810.7012.36.3
Oct13° / 11312.10.510.73.5
Nov / -1°8612.13.59.30.6
Dec-1° / -8°8312.59.28.60.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25446
35446
45347
55347
65347
75248
85248
95149
105149
115149
125149
135149
145149
155050
165050
175050
185050
195149
205149
215149
225149
235248
245248
255248
265248
275248
285248
295248
305248
315248

Chance of precipitation in August

Any precipitation

Saint-Jean-sur-Richelieu gets around 108 mm of rain over 12.4 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 43% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
143
243
343
443
543
643
743
843
943
1043
1142
1242
1342
1441
1541
1640
1740
1839
1938
2038
2137
2237
2336
2436
2535
2635
2735
2835
2935
3035
3135

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 31% 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 (%)
1152534223
2152534223
3152534223
4152535223
5152635213
6152635213
7152635213
8162635213
9162635213
10172635202
11172634202
12182634202
13192634192
14192634192
15202634182
16212634172
17222633172
18232732162
19242732162
20252731152
21262730152
22272729152
23292728142
24302727142
25322725142
26332824142
27342823131
28352822131
29362821131
30372820131
31392820121

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 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 4:41 AM to 5:18 AM, and sunset from 7:17 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.64:417:17
214.64:427:16
314.54:447:14
414.54:457:13
514.44:467:12
614.44:477:10
714.34:487:09
814.34:507:07
914.34:517:06
1014.24:527:04
1114.24:537:03
1214.14:547:01
1314.14:567:00
1414.04:576:58
1514.04:586:57
1613.94:596:55
1713.95:016:53
1813.85:026:52
1913.85:036:50
2013.75:046:48
2113.75:066:46
2213.65:076:45
2313.65:086:43
2413.55:096:41
2513.55:116:39
2613.45:126:37
2713.45:136:36
2813.35:146:34
2913.35:166:32
3013.25:176:30
3113.25:186:28

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.13 kWh/m².

For context, solar energy here swings from a low near 1.23 kWh/m² to a high of 5.92 kWh/m² in July across the year — August's 5.13 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
165.1Bright
175.1Bright
185.1Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
234.9Bright
244.9Bright
254.8Bright
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-Jean-sur-Richelieu?

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

6.5
Sightseeing
1st-best month of the year
5.8
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Saint-Jean-sur-Richelieu for sightseeing.

What to pack for Saint-Jean-sur-Richelieu in August

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

In August, Saint-Jean-sur-Richelieu 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-Jean-sur-Richelieu in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 3 — 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-Jean-sur-Richelieu 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 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug3Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Saint-Jean-sur-Richelieu?

Saint-Jean-sur-Richelieu sits at 45.3°N, 73.3°W, 32 m above sea level, in Canada. The nearest listed city is Chambly, 16 km away.

Topography around Saint-Jean-sur-Richelieu

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

Within 3 km, the terrain around Saint-Jean-sur-Richelieu has only modest variations in elevation — a maximum elevation change of 42 m around an average of 36 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 275 m; within 80 km, large variations in elevation — a maximum elevation change of 1,181 m.

The land around Saint-Jean-sur-Richelieu is covered by artificial surfaces (41%) within 3 km, cropland (71%) within 16 km, and trees (47%) and cropland (35%) within 80 km.

3 km
42 m
16 km
275 m
80 km
1,181 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Chambly 16 km · Candiac 22 km · La Prairie 22 km · Brossard 22 km · Saint-Hubert 25 km · Saint-Constant 25 km · Saint-Basile-le-Grand 25 km · Greenfield Park 25 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-Jean-sur-Richelieu (45.3071°, -73.2626°, elevation 32 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).