Ajax weather in October

In October, Ajax sees average daytime highs of 14°C and overnight lows near 10°C, with 95 mm of precipitation across 12.1 wet days and about 10.8 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 11°C by the end. The sky is clear or mostly clear about 23% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of October to 10 h 06 min by month's end. Set against the rest of the year, October is Ajax's 6th-clearest and 5th-windiest month. For the whole year in context, see Ajax's year-round climate.

Daytime high
14°
5th warmest
Overnight low
10°
8th coldest
Precipitation
95 mm
12.1 wet days
Daylight
10 h 48 min
6:38 AM – 5:24 PM
Cloud cover
64%
6th clearest
Wind
21 km/h
5th windiest
Solar energy
2.65 kWh/m²
Travel score
3.8
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 October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 17°C in the first days to 11°C by the end.

A typical October day in Ajax reaches about 14°C in the afternoon and slips back to 10°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 18°C. Set against its neighbours, October runs about 6°C cooler than September and about 6°C warmer than November.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11713
21713
31713
41712
51612
61612
71612
81611
91611
101511
111511
121511
131510
141410
151410
161410
17149
18139
19139
20139
21139
22128
23128
24128
25128
26118
27117
28117
29117
30117
31107

How October really feels in Ajax

Once humidity and wind are folded in, October 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

October 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 October compares with the rest of the year at a glance. October is the 5th-warmest and 2nd-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 October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 18% of October, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
34951
44951
54852
64852
74753
84753
94654
104555
114555
124456
134357
144357
154258
164159
174060
183961
193862
203862
213664
223664
233565
243664
253664
263565
273565
283664
293664
303664
313565

Chance of precipitation in October

Any precipitation

Ajax gets around 95 mm of rain and snow over 12.1 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 41% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
238
338
438
538
638
738
838
938
1038
1138
1238
1338
1439
1539
1639
1740
1840
1941
2041
2141
2241
2340
2440
2540
2639
2739
2838
2938
3037
3137

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1691993
2701893
3721783
4751672
5751672
6771562
7791452
8791452
9801352
10831241
11841141
12851131
13861031
14861031
1588921
1690820
1791810
1891810
1992710
2092710
2194600
2295500
2395500
2496400
2596400
2697300
2797300
2897300
2998200
3098200
3198200

Wind in October

Winds average 21 km/h in October.

Across October, daily wind ranges from about 20 km/h on the calmest days to 22 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
120light breeze
220light breeze
320light breeze
420breezy
520breezy
620breezy
720breezy
820breezy
921breezy
1021breezy
1121breezy
1221breezy
1321breezy
1421breezy
1521breezy
1621breezy
1722breezy
1822breezy
1922breezy
2022breezy
2122breezy
2222breezy
2322breezy
2422breezy
2522breezy
2622breezy
2722breezy
2822breezy
2922breezy
3022breezy
3122breezy

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 30 min at the start of October to 10 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over October. Sunrise moves from 6:19 AM to 6:58 AM, and sunset from 5:51 PM to 5:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:195:51
211.56:215:49
311.46:225:47
411.46:235:45
511.36:245:43
611.36:265:42
711.26:275:40
811.26:285:38
911.16:295:36
1011.16:315:34
1111.06:325:33
1211.06:335:31
1310.96:345:29
1410.96:365:28
1510.86:375:26
1610.86:385:24
1710.76:395:22
1810.76:415:21
1910.66:425:19
2010.66:435:18
2110.56:455:16
2210.56:465:14
2310.46:475:13
2410.46:495:11
2510.36:505:10
2610.36:515:08
2710.26:535:07
2810.26:545:06
2910.16:555:04
3010.16:575:03
3110.16:585:01

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.65 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 — October's 2.65 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.4Moderate
23.3Moderate
33.3Moderate
43.2Moderate
53.2Moderate
63.1Moderate
73.1Moderate
83.0Moderate
93.0Moderate
103.0Moderate
112.9Moderate
122.9Moderate
132.8Moderate
142.7Moderate
152.7Moderate
162.6Moderate
172.6Moderate
182.5Moderate
192.5Moderate
202.4Moderate
212.4Moderate
222.4Moderate
232.3Moderate
242.3Moderate
252.2Moderate
262.2Moderate
272.2Moderate
282.1Moderate
292.1Moderate
302.1Moderate
312.1Moderate
Planning a trip in October

Is October a good time to visit Ajax?

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

3.8
Sightseeing
5th-best month of the year
0.3
Beach & pool
5th-best month of the year

October is a weaker month for outdoor sightseeing in Ajax.

What to pack for Ajax in October

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

In October, Ajax sees daytime highs around 14°C and nights near 10°C. Worth packing: a warm layer, rain gear and a windbreaker. About 12 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Ajax in October

The nearest coast averages about 13°C in October — 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 October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 3. 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 October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October 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
October 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).