Ajax in Fall
In fall (September, October and November), Ajax sees average daytime highs around 14°C and overnight lows near 10°C, with 272 mm of precipitation over about 33 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 22°C in early September to 5°C by late November. The sky is clear or mostly clear about 26% of the time across fall, and the air most often feels dry.
Fall is Ajax's 2nd-best season to visit on our travel score. For the whole year in context, see Ajax's year-round climate.
- Avg daytime high
- 14°C
- 2nd-warmest season
- Avg overnight low
- 10°C
- Precipitation
- 272 mm
- 33 wet days
- Avg wind
- 21 km/h
- Travel score
- 3.8
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Ajax in Fall
Over the season highs ease from about 22°C in early September to 5°C by late November.
A typical fall day in Ajax reaches about 14°C and drops to 10°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Ajax
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 20 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Ajax weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -1° / -6° | 86 | 12.5 | 9.7 | 9.1 | 0.0 |
| Feb | -1° / -7° | 61 | 9 | 6.9 | 10.2 | 0.0 |
| Mar | 2° / -3° | 70 | 10.1 | 4.7 | 11.6 | 0.0 |
| Apr | 6° / 2° | 96 | 11 | 1.6 | 13.2 | 0.7 |
| May | 12° / 8° | 78 | 10.1 | 0 | 14.5 | 3.0 |
| Jun | 18° / 14° | 76 | 9.7 | 0 | 15.2 | 5.7 |
| Jul | 23° / 19° | 67 | 8.9 | 0 | 14.9 | 7.0 |
| Aug | 23° / 19° | 67 | 8.8 | 0 | 13.8 | 7.2 |
| Sep | 20° / 16° | 85 | 9.1 | 0 | 12.3 | 6.5 |
| Oct | 14° / 10° | 95 | 12.1 | 0.1 | 10.8 | 3.8 |
| Nov | 7° / 4° | 92 | 11.4 | 2.2 | 9.5 | 1.0 |
| Dec | 3° / -2° | 87 | 12.6 | 6.8 | 8.8 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 26% of the time across fall.
Chance of precipitation in Fall
Ajax gets around 272 mm of rain and snow over 33 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 21 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 06 min in early September to 9 hours by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 2.8 kWh/m².
Is fall a good time to visit Ajax?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in Ajax.
What to pack for Ajax in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Ajax sees daytime highs around 14°C and nights near 10°C. Pack a warm layer. Worth having: a heavy coat, rain gear and a windbreaker. About 33 days see rain.
Sea temperature near Ajax in Fall
The nearest coast averages about 13°C across fall — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 4 | 3 | 3 | 4 | 7 | 14 | 19 | 21 | 19 | 13 | 8 | 5 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 4 | Bracing |
| Feb | 3 | Bracing |
| Mar | 3 | Bracing |
| Apr | 4 | Bracing |
| May | 7 | Bracing |
| Jun | 14 | Bracing |
| Jul | 19 | Cool |
| Aug | 21 | Refreshing |
| Sep | 19 | Cool |
| Oct | 13 | Bracing |
| Nov | 8 | Bracing |
| Dec | 5 | Bracing |
UV index in Ajax in Fall
Clear-sky midday UV across fall averages around 3 — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 5 | 6 | 8 | 8 | 6 | 5 | 3 | 2 | 1 |
| Level | Low | Low | Moderate | High | High | Very high | Very high | High | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 4 | Moderate |
| Apr | 5 | High |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 5 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Ajax in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 14 | 17 | 18 | 21 | 20 | 20 | 17 | 16 | 11 | 10 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 17 | Moderate |
| Apr | 18 | Moderate |
| May | 21 | Moderate |
| Jun | 20 | Moderate |
| Jul | 20 | Moderate |
| Aug | 17 | Moderate |
| Sep | 16 | Moderate |
| Oct | 11 | Good |
| Nov | 10 | Good |
| Dec | 10 | Good |
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.
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
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.