Hamilton weather in August

In August, Hamilton sees average daytime highs of 25°C and overnight lows near 18°C, with 69 mm of rain across 9.4 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 10th-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 35% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 24 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Hamilton's 1st-clearest and 11th-windiest month. For the whole year in context, see Hamilton's year-round climate.

Daytime high
25°
2nd warmest
Overnight low
18°
11th coldest
Rainfall
69 mm
9.4 wet days
Daylight
13 h 48 min
5:30 AM – 7:17 PM
Cloud cover
54%
1st clearest
Wind
11 km/h
11th windiest
Solar energy
5.32 kWh/m²
Travel score
7.0
out of 10

Hamilton is city in Ontario, Canada.

Air quality
Good
PM2.5 8.5 µg/m³ · 2019
Founded
1846

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 Hamilton reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°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 on par with July and about 4°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12618
22618
32618
42618
52618
62618
72618
82518
92518
102518
112518
122518
132518
142518
152518
162518
172518
182518
192517
202517
212517
222517
232517
242517
252517
262417
272417
282417
292417
302417
312417

How August really feels in Hamilton

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.

Hamilton weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -7°7111.48.19.20.0
Feb / -7°568.56.410.20.0
Mar / -3°699.94.511.60.2
Apr11° / 9411.51.813.22.4
May17° / 8311.2014.55.1
Jun22° / 15°8611.6015.16.5
Jul26° / 18°7710014.96.8
Aug25° / 18°699.4013.87.0
Sep21° / 14°779.3012.36.7
Oct15° / 8511010.84.2
Nov / 7910.32.19.51.2
Dec / -3°7110.55.88.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 23% of August, with mostly cloudy or overcast conditions the remaining 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35941
45842
55842
65941
75941
85941
95941
105941
115842
125941
135941
145941
155941
165941
175842
185842
195842
205842
215842
225842
235842
245842
255842
265842
275842
285842
295743
305743
315743

Chance of precipitation in August

Any precipitation

Hamilton gets around 69 mm of rain over 9.4 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 31% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
134
234
333
433
533
633
733
833
933
1032
1132
1232
1331
1431
1531
1631
1730
1830
1929
2029
2129
2229
2328
2428
2528
2628
2728
2828
2928
3028
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 28% of days. Sticky, muggy-or-worse air turns up on roughly 28% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1142531246
2142531246
3142530246
4142530246
5152529256
6152529256
7162529256
8162528246
9172528246
10172528246
11172528246
12172528246
13182528245
14182529235
15182529235
16182529235
17182529235
18182529234
19192529234
20192529234
21192529234
22192528234
23202628234
24202628233
25212627223
26222627223
27222626223
28232626223
29242625213
30252625213
31262624203

Wind in August

Winds average 11 km/h in August.

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
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 24 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 78 minutes over August. Sunrise moves from 5:13 AM to 5:47 AM, and sunset from 7:38 PM to 6:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.45:137:38
214.45:147:36
314.35:157:35
414.35:167:34
514.35:187:33
614.25:197:31
714.25:207:30
814.15:217:29
914.15:227:27
1014.05:237:26
1114.05:247:25
1214.05:257:23
1313.95:267:22
1413.95:287:20
1513.85:297:19
1613.85:307:17
1713.75:317:16
1813.75:327:14
1913.75:337:12
2013.65:347:11
2113.65:357:09
2213.55:377:08
2313.55:387:06
2413.45:397:04
2513.45:407:03
2613.35:417:01
2713.35:426:59
2813.25:436:57
2913.25:456:56
3013.15:466:54
3113.15:476:52

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.32 kWh/m².

For context, solar energy here swings from a low near 1.32 kWh/m² to a high of 6.31 kWh/m² in June across the year — August's 5.32 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.6Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Is August a good time to visit Hamilton?

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

7.0
Sightseeing
1st-best month of the year
6.3
Beach & pool
2nd-best month of the year

August is one of the better times to visit Hamilton for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Hamilton in August

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

In August, Hamilton sees daytime highs around 25°C and nights near 18°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Hamilton in August

The nearest coast averages about 21°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 23 km away) is warmest in August at about 21°C and coldest in February near 3°C.

It's comfortable for a long swim from Jul 22 to Sep 1 — about 1.4 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr4Bracing
May8Bracing
Jun15Cool
Jul20Cool
Aug21Refreshing
Sep19Cool
Oct13Bracing
Nov8Bracing
Dec5Bracing

UV index in Hamilton 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 Hamilton peaks around June 22 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 22UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May6High
Jun8Very high
Jul8Very high
Aug7High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Hamilton?

Hamilton sits at 43.3°N, 79.8°W, 95 m above sea level, in Canada. The nearest listed city is Stoney Creek, 8.0 km away.

Topography around Hamilton

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

Within 3 km, the terrain around Hamilton has only modest variations in elevation — a maximum elevation change of 144 m around an average of 125 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 235 m; within 80 km, significant variations in elevation — a maximum elevation change of 457 m.

The land around Hamilton is covered by artificial surfaces (66%) and trees (25%) within 3 km, trees (28%) and cropland (20%) within 16 km, and cropland (31%), water (29%) and trees (22%) within 80 km.

3 km
144 m
16 km
235 m
80 km
457 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Stoney Creek 8.0 km · Waterdown 10 km · Ancaster 12 km · Burlington 15 km · Grimsby 24 km · Oakville 26 km · Milton 30 km · Brantford 36 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 Hamilton (43.2501°, -79.8496°, elevation 95 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).