Ajax weather in August

In August, Ajax sees average daytime highs of 23°C and overnight lows near 19°C, with 67 mm of rain across 8.8 wet days and about 13.8 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 41% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 30 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Ajax's 1st-clearest and 10th-windiest month. For the whole year in context, see Ajax's year-round climate.

Daytime high
23°
1st warmest
Overnight low
19°
12th coldest
Rainfall
67 mm
8.8 wet days
Daylight
13 h 48 min
5:25 AM – 7:15 PM
Cloud cover
50%
1st clearest
Wind
15 km/h
10th windiest
Solar energy
5.37 kWh/m²
Travel score
7.2
out of 10

Ajax is town in Durham Region, Ontario, Canada.

Density
1,786/km²
people per km²

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 23°C through the month.

A typical August day in Ajax reaches about 23°C in the afternoon and slips back to 19°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 26°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12420
22420
32420
42420
52420
62420
72420
82320
92320
102320
112320
122320
132320
142319
152319
162319
172319
182319
192319
202319
212319
222319
232319
242319
252319
262319
272319
282319
292319
302219
312218

How August really feels in Ajax

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.

Ajax weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -6°8612.59.79.10.0
Feb-1° / -7°6196.910.20.0
Mar / -3°7010.14.711.60.0
Apr / 96111.613.20.7
May12° / 7810.1014.53.0
Jun18° / 14°769.7015.25.7
Jul23° / 19°678.9014.97.0
Aug23° / 19°678.8013.87.2
Sep20° / 16°859.1012.36.5
Oct14° / 10°9512.10.110.83.8
Nov / 9211.42.29.51.0
Dec / -2°8712.66.88.80.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% 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 38%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26139
36139
46238
56238
66238
76238
86238
96238
106238
116238
126337
136337
146337
156337
166337
176337
186337
196337
206337
216337
226337
236337
246238
256238
266238
276238
286238
296139
306040
316040

Chance of precipitation in August

Any precipitation

Ajax gets around 67 mm of rain over 8.8 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
331
431
531
631
731
831
931
1031
1131
1231
1330
1430
1530
1629
1729
1828
1928
2027
2127
2227
2326
2426
2526
2625
2725
2825
2925
3026
3126

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 34% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1101833327
2101932337
3101931337
4102031327
5102030327
6112130327
7112129317
8112129317
9122229307
10122229307
11122329297
12132329297
13132329287
14142329287
15142429276
16142429276
17142429266
18152429266
19152429265
20152429265
21162429265
22162429265
23172429255
24172528254
25182528254
26192527254
27192527254
28202526244
29212626244
30212625244
31222624234

Wind in August

Winds average 15 km/h in August.

Across August, daily wind ranges from about 15 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 30 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 84 minutes over August. Sunrise moves from 5:08 AM to 5:43 AM, and sunset from 7:36 PM to 6:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:087:36
214.45:107:35
314.45:117:34
414.35:127:32
514.35:137:31
614.35:147:30
714.25:157:28
814.25:167:27
914.15:177:26
1014.15:187:24
1114.15:207:23
1214.05:217:21
1314.05:227:20
1413.95:237:18
1513.95:247:17
1613.85:257:15
1713.85:277:13
1813.75:287:12
1913.75:297:10
2013.65:307:09
2113.65:317:07
2213.55:327:05
2313.55:347:04
2413.55:357:02
2513.45:367:00
2613.45:376:58
2713.35:386:57
2813.35:396:55
2913.25:416:53
3013.25:426:51
3113.15:436:49

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.37 kWh/m².

For context, solar energy here swings from a low near 1.28 kWh/m² to a high of 6.32 kWh/m² in June across the year — August's 5.37 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.7Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.4Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.2Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Is August a good time to visit Ajax?

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

7.2
Sightseeing
1st-best month of the year
5.6
Beach & pool
1st-best month of the year

August is one of the better times to visit Ajax for general sightseeing.

What to pack for Ajax in August

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

In August, Ajax sees daytime highs around 23°C and nights near 19°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Ajax 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 13 km away) is warmest in August at about 21°C and coldest in March near 3°C.

It's comfortable for a long swim from Jul 27 to Sep 2 — about 1.2 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr4Bracing
May7Bracing
Jun14Bracing
Jul19Cool
Aug21Refreshing
Sep19Cool
Oct13Bracing
Nov8Bracing
Dec5Bracing

UV index in Ajax 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 Ajax peaks around June 21 at about 8 (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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 21UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May6High
Jun8Very high
Jul8Very high
Aug6High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Ajax in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Ajax is worst in May — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMay 2021 µg/m³Nov 2310 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar17Moderate
Apr18Moderate
May21Moderate
Jun20Moderate
Jul20Moderate
Aug17Moderate
Sep16Moderate
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Ajax?

Ajax sits at 43.9°N, 79.0°W, 97 m above sea level, in Canada. The nearest listed city is Whitby, 9.0 km away.

Topography around Ajax

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

Within 3 km, the terrain around Ajax has only modest variations in elevation — a maximum elevation change of 62 m around an average of 95 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 215 m; within 80 km, significant variations in elevation — a maximum elevation change of 484 m.

The land around Ajax is covered by artificial surfaces (53%) and trees (28%) within 3 km, water (35%) and trees (23%) within 16 km, and water (39%) and trees (24%) within 80 km.

3 km
62 m
16 km
215 m
80 km
484 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Whitby 9.0 km · Pickering 10 km · Rouge 12 km · Brooklin 13 km · West Hill 15 km · Morningside 16 km · Oshawa 16 km · Malvern 16 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 Ajax (43.8501°, -79.0329°, elevation 97 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).