Chatham weather in August

In August, Chatham sees average daytime highs of 26°C and overnight lows near 17°C, with 77 mm of rain across 10.4 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 5th-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 35% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 18 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Chatham's 3rd-clearest and 12th-windiest month. For the whole year in context, see Chatham's year-round climate.

Daytime high
26°
2nd warmest
Overnight low
17°
11th coldest
Rainfall
77 mm
10.4 wet days
Daylight
13 h 42 min
5:41 AM – 7:25 PM
Cloud cover
54%
3rd clearest
Wind
12 km/h
12th windiest
Solar energy
5.5 kWh/m²
Travel score
6.8
out of 10

Chatham is community in Ontario, Canada.

Air quality
Good
PM2.5 7 µg/m³ · 2019
Founded
1998

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

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

A typical August day in Chatham reaches about 26°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 30°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°35°151015202531
Avg high (°C)Avg low (°C)
12718
22718
32718
42618
52618
62618
72618
82618
92618
102618
112617
122617
132617
142617
152617
162617
172617
182617
192617
202617
212617
222517
232517
242517
252517
262517
272517
282516
292516
302516
312516

How August really feels in Chatham

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.

Chatham 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-1° / -7°6610.56.69.30.0
Feb / -7°548.5610.30.0
Mar / -3°6610.24.411.60.5
Apr13° / 8912.21.313.13.3
May19° / 10°9212.3014.45.7
Jun25° / 15°9411.20156.6
Jul27° / 18°8611.1014.86.5
Aug26° / 17°7710.4013.76.8
Sep22° / 13°738.7012.36.9
Oct15° / 7610.3010.84.6
Nov / 719.71.99.61.4
Dec / -3°6310.1590.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 22% of August, with mostly cloudy or overcast conditions the remaining 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35941
45842
55842
65842
75842
85743
95743
105743
115644
125743
135743
145743
155743
165743
175842
185743
195743
205743
215743
225743
235842
245842
255941
265842
275941
285941
296040
306040
315941

Chance of precipitation in August

Any precipitation

Chatham gets around 77 mm of rain over 10.4 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 33% and peaks near 36% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
436
535
635
735
835
935
1035
1135
1235
1335
1435
1534
1634
1734
1834
1933
2033
2133
2232
2332
2431
2531
2630
2730
2829
2929
3029
3129

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 26% of days. Sticky, muggy-or-worse air turns up on roughly 33% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
112242825101
212242825101
312242825101
413242825101
513242825101
614242724101
714242724101
814242724101
915242624101
101525262491
111525262491
121625262491
131626262481
141626262481
151626262481
161626262471
171626262570
181626262570
191626262570
201626262570
211626252670
221626252660
231626252660
241726252660
251726252560
261826252560
271926242460
282026242460
292126242360
302226242260
312326232260

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
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 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 72 minutes over August. Sunrise moves from 5:25 AM to 5:57 AM, and sunset from 7:45 PM to 7:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.35:257:45
214.35:267:44
314.35:277:43
414.25:287:41
514.25:297:40
614.15:307:39
714.15:317:38
814.15:327:36
914.05:337:35
1014.05:347:34
1113.95:357:32
1213.95:367:31
1313.95:377:29
1413.85:397:28
1513.85:407:26
1613.75:417:25
1713.75:427:23
1813.65:437:22
1913.65:447:20
2013.65:457:19
2113.55:467:17
2213.55:477:16
2313.45:487:14
2413.45:497:12
2513.35:517:11
2613.35:527:09
2713.25:537:07
2813.25:547:06
2913.15:557:04
3013.15:567:02
3113.15:577:00

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.5 kWh/m².

For context, solar energy here swings from a low near 1.45 kWh/m² to a high of 6.53 kWh/m² in June across the year — August's 5.5 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Bright
26.0Bright
35.9Bright
45.9Bright
55.9Bright
65.8Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.7Bright
125.6Bright
135.6Bright
145.5Bright
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
295.1Bright
305.0Bright
315.0Bright
Planning a trip in August

Is August a good time to visit Chatham?

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

6.8
Sightseeing
2nd-best month of the year
6.4
Beach & pool
2nd-best month of the year

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

What to pack for Chatham in August

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

In August, Chatham sees daytime highs around 26°C and nights near 17°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Chatham in August

The nearest coast averages about 24°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 32 km away) is warmest in August at about 24°C and coldest in February near 1°C.

It's comfortable for a long swim from Jun 29 to Sep 23 — about 2.9 months when the water holds above 20°C.

0°10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr5Bracing
May11Bracing
Jun18Cool
Jul23Refreshing
Aug24Refreshing
Sep21Refreshing
Oct16Cool
Nov10Bracing
Dec5Bracing

UV index in Chatham in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chatham peaks around June 21 at about 9 (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 21UV 9Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Chatham?

Chatham sits at 42.4°N, 82.2°W, 183 m above sea level, in Canada. The nearest listed city is Leamington, 53 km away.

Topography around Chatham

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

Within 3 km, the terrain around Chatham has only modest variations in elevation — a maximum elevation change of 27 m around an average of 182 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 62 m; within 80 km, only modest variations in elevation — a maximum elevation change of 159 m.

The land around Chatham is covered by artificial surfaces (34%), trees (26%) and cropland (25%) within 3 km, cropland (88%) within 16 km, and water (44%) and cropland (36%) within 80 km.

3 km
27 m
16 km
62 m
80 km
159 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Leamington 53 km · Kingsville 57 km · Tecumseh 58 km · Saint Clair Shores 59 km · Grosse Pointe Woods 59 km · Mount Clemens 60 km · Roseville 62 km · Clinton Township 63 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 Chatham (42.4122°, -82.1849°, elevation 183 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).