Moncton weather in August

In August, Moncton sees average daytime highs of 23°C and overnight lows near 14°C, with 77 mm of rain across 9.8 wet days and about 14 hours of daylight. It is the 2nd-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 22°C by the end. The sky is clear or mostly clear about 27% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 h 42 min at the start of August to 13 h 12 min by month's end. Set against the rest of the year, August is Moncton's 2nd-clearest and 12th-windiest month. For the whole year in context, see Moncton's year-round climate.

Daytime high
23°
2nd warmest
Overnight low
14°
11th coldest
Rainfall
77 mm
9.8 wet days
Daylight
14 hours
5:24 AM – 7:23 PM
Cloud cover
60%
2nd clearest
Wind
12 km/h
12th windiest
Solar energy
4.96 kWh/m²
Travel score
6.9
out of 10

Moncton is city in New Brunswick, Canada.

Air quality
Excellent
PM2.5 4 µg/m³ · 2019
Density
612/km²
people per km²
Founded
1766

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 24°C in the first days to 22°C by the end.

A typical August day in Moncton reaches about 23°C in the afternoon and slips back to 14°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, August runs on par with July and about 4°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12415
22415
32415
42415
52415
62415
72414
82414
92414
102414
112414
122414
132414
142414
152414
162414
172314
182314
192314
202314
212313
222313
232313
242313
252313
262313
272213
282213
292212
302212
312212

How August really feels in Moncton

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.

Moncton weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -13°9311.49.38.90.0
Feb-2° / -12°82108.9100.0
Mar / -7°9811.58.611.60.0
Apr / -1°8512.55.313.31.6
May15° / 8512.50.514.74.2
Jun20° / 10°9111.8015.55.9
Jul24° / 14°8211.5015.26.6
Aug23° / 14°779.80146.9
Sep19° / 10°939.3012.36.2
Oct13° / 9810.70.410.73.4
Nov / -1°9810.83.89.20.6
Dec / -8°11312.28.58.50.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24357
34456
44456
54555
64555
74555
84555
94555
104555
114555
124555
134654
144654
154654
164654
174654
184654
194654
204654
214654
224753
234753
244654
254654
264654
274654
284654
294654
304654
314654

Chance of precipitation in August

Any precipitation

Moncton gets around 77 mm of rain over 9.8 wet days in August, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 32% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
534
634
734
834
934
1034
1134
1234
1333
1433
1532
1632
1731
1831
1930
2030
2130
2230
2329
2429
2529
2629
2729
2829
2929
3029
3129

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
125343011
225352910
326352910
42636299
52736299
62736288
72737288
82837278
92837278
102937278
112937267
123037267
133137267
143136257
153236257
163336257
173335257
183435246
193534246
203734236
213833236
223933225
234032225
244232215
254331215
264531204
274630194
284830184
294929184
305029174
315129164

Wind in August

Winds average 12 km/h in August, the calmest month.

Across August, daily wind ranges from about 11 km/h on the calmest days to 12 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
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 42 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 90 minutes over August. Sunrise moves from 5:05 AM to 5:43 AM, and sunset from 7:45 PM to 6:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.75:057:45
214.65:067:44
314.65:087:43
414.55:097:41
514.55:107:40
614.55:117:38
714.45:137:37
814.45:147:35
914.35:157:34
1014.35:167:32
1114.25:187:31
1214.25:197:29
1314.15:207:28
1414.15:217:26
1514.05:237:24
1614.05:247:23
1713.95:257:21
1813.95:267:19
1913.85:287:18
2013.85:297:16
2113.75:307:14
2213.75:327:12
2313.65:337:10
2413.65:347:09
2513.55:357:07
2613.55:377:05
2713.45:387:03
2813.45:397:01
2913.35:416:59
3013.35:426:57
3113.25:436:55

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.96 kWh/m².

For context, solar energy here swings from a low near 1.21 kWh/m² to a high of 5.61 kWh/m² in June across the year — August's 4.96 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.1Bright
115.1Bright
125.1Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.7Bright
254.7Bright
264.6Bright
274.6Bright
284.6Bright
294.5Bright
304.5Bright
314.4Bright
Planning a trip in August

Is August a good time to visit Moncton?

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

6.9
Sightseeing
1st-best month of the year
5.5
Beach & pool
1st-best month of the year

August is a reasonable time to visit Moncton for sightseeing.

What to pack for Moncton in August

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

In August, Moncton sees daytime highs around 23°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Moncton in August

The nearest coast averages about 18°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 34 km away) is warmest in August at about 18°C and coldest in February near -1°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan-1Bracing
Feb-1Bracing
Mar-1Bracing
Apr1Bracing
May6Bracing
Jun12Bracing
Jul17Cool
Aug18Cool
Sep16Cool
Oct12Bracing
Nov7Bracing
Dec2Bracing

UV index in Moncton 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 Moncton peaks around June 23 at about 7 (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 highHighModerateLowJun 23UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7Very high
Jul7Very high
Aug6High
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Moncton?

Moncton sits at 46.1°N, 64.8°W, 30 m above sea level, in Canada. The nearest listed city is Riverview, 5.0 km away.

Topography around Moncton

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

Within 3 km, the terrain around Moncton has only modest variations in elevation — a maximum elevation change of 53 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 209 m; within 80 km, significant variations in elevation — a maximum elevation change of 453 m.

The land around Moncton is covered by artificial surfaces (40%), trees (27%) and grassland (21%) within 3 km, trees (75%) within 16 km, and trees (66%) and water (23%) within 80 km.

3 km
53 m
16 km
209 m
80 km
453 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Riverview 5.0 km · Dieppe 9.0 km · Lutes Mountain 10 km · Quispamsis 117 km · Miramichi 117 km · Charlottetown 130 km · Saint John 134 km · Saint John West 136 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 Moncton (46.0945°, -64.7965°, elevation 30 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).