Saint John in Fall
In fall (September, October and November), Saint John sees average daytime highs around 12°C and overnight lows near 7°C, with 369 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 18°C in early September to 5°C by late November. The sky is clear or mostly clear about 27% of the time across fall, and the air most often feels dry.
Fall is Saint John's 2nd-best season to visit on our travel score. For the whole year in context, see Saint John's year-round climate.
- Avg daytime high
- 12°C
- 2nd-warmest season
- Avg overnight low
- 7°C
- Precipitation
- 369 mm
- 33 wet days
- Avg wind
- 19 km/h
- Travel score
- 3.0
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Saint John in Fall
Over the season highs ease from about 18°C in early September to 5°C by late November.
A typical fall day in Saint John reaches about 12°C and drops to 7°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Saint John
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 27 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Saint John 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 | -2° / -9° | 112 | 11.6 | 8.4 | 8.9 | 0.0 |
| Feb | -1° / -8° | 95 | 10.3 | 8.2 | 10.1 | 0.0 |
| Mar | 2° / -4° | 112 | 11.4 | 7.2 | 11.6 | 0.0 |
| Apr | 6° / 1° | 105 | 12.3 | 3.4 | 13.2 | 0.5 |
| May | 11° / 6° | 104 | 12.3 | 0.2 | 14.6 | 2.4 |
| Jun | 15° / 11° | 108 | 12.1 | 0 | 15.4 | 4.3 |
| Jul | 18° / 14° | 91 | 11 | 0 | 15.1 | 5.6 |
| Aug | 19° / 14° | 81 | 9.3 | 0 | 13.9 | 6.1 |
| Sep | 16° / 12° | 108 | 10 | 0 | 12.3 | 5.1 |
| Oct | 12° / 7° | 133 | 10.9 | 0.2 | 10.7 | 3.1 |
| Nov | 7° / 2° | 128 | 11.8 | 2.3 | 9.3 | 0.8 |
| Dec | 2° / -4° | 137 | 13.1 | 6.9 | 8.6 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 27% of the time across fall.
Chance of precipitation in Fall
Saint John gets around 369 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 19 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 06 min in early September to 8 h 48 min 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 2.7 kWh/m².
Is fall a good time to visit Saint John?
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 Saint John.
What to pack for Saint John in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Saint John sees daytime highs around 12°C and nights near 7°C. Pack a warm layer. Worth having: a heavy coat, rain gear and a windbreaker. About 33 days see rain.
Sea temperature near Saint John in Fall
The nearest coast averages about 11°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 17 km away) is warmest in August at about 14°C and coldest in March near 2°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 5 | 3 | 2 | 3 | 6 | 9 | 13 | 14 | 13 | 12 | 10 | 7 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 5 | Bracing |
| Feb | 3 | Bracing |
| Mar | 2 | Bracing |
| Apr | 3 | Bracing |
| May | 6 | Bracing |
| Jun | 9 | Bracing |
| Jul | 13 | Bracing |
| Aug | 14 | Bracing |
| Sep | 13 | Bracing |
| Oct | 12 | Bracing |
| Nov | 10 | Bracing |
| Dec | 7 | Bracing |
UV index in Saint John 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 Saint John peaks around July 11 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 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 | 3 | 5 | 7 | 7 | 7 | 6 | 5 | 3 | 2 | 1 |
| Level | Low | Low | Moderate | Moderate | High | Very high | Very high | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | Moderate |
| May | 7 | High |
| Jun | 7 | Very high |
| Jul | 7 | Very high |
| Aug | 6 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Saint John?
Saint John sits at 45.3°N, 66.1°W, 30 m above sea level, in Canada. The nearest listed city is Saint John West, 2.0 km away.
Topography around Saint John
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint John.
Within 3 km, the terrain around Saint John has only modest variations in elevation — a maximum elevation change of 95 m around an average of 16 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 234 m; within 80 km, significant variations in elevation — a maximum elevation change of 449 m.
The land around Saint John is covered by water (38%), artificial surfaces (29%) and trees (21%) within 3 km, trees (52%) and water (38%) within 16 km, and trees (49%) and water (45%) 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 Saint John (45.2708°, -66.0562°, elevation 30 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.