Westmount, Canada experiences average highs of 12°C (54°F) and lows of 4°C (39°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Average highs have stayed broadly stable across the available records.
Westmount, Canada Weather & Climate 2026
Monthly climate averages for Westmount, Canada. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.5/10
Best: May, June, July, August, September
UV Index
4
Low
Temperature 12°C / 4°C
Feels Like 10°C / 1°C
Rainy Days 12
Rainfall 100 mm
Sunshine 8 h
Humidity 72%
Wind Speed 19 km/h
Dew Point 3°C
Snow Days 10 days
Frost Days 20 days
Hottest Month
27°C
July
Avg Low18°C
Rain13days
Coldest Month
-12°C
January
Avg High-4°C
Rain11days
Driest Month
8days
September
Avg High21°C
Avg Low13°C
Windiest Month
21 km/h
February (Gusts 40)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:06
Daylight 15.7h
Sunset 20:46
Live conditions—
Westmount on the map · live conditions
Westmount, Canada
- Continent
- Americas
- Country
- Canada
- City
- Westmount
- Population
- 20.5K
- Coordinates
- 45.48°, -73.60°
Seasonal Breakdown
Spring
Mar–May
Avg High 11°C
Avg Low 2°C
Rain 13 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 25°C
Avg Low 17°C
Rain 13 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 14°C
Avg Low 7°C
Rain 10 days/mo
1/3 best months
Winter
Dec–Feb
Avg High -2°C
Avg Low -10°C
Rain 12 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: -4°C / -12°C . Feb: -2°C / -11°C . Mar: 3°C / -5°C . Apr: 11°C / 1°C . May: 19°C / 9°C . Jun: 24°C / 15°C . Jul: 27°C / 18°C . Aug: 25°C / 17°C . Sep: 21°C / 13°C . Oct: 15°C / 8°C . Nov: 6°C / 0°C . Dec: -1°C / -8°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 79 mm. Feb: 80 mm. Mar: 85 mm. Apr: 121 mm. May: 87 mm. Jun: 121 mm. Jul: 112 mm. Aug: 126 mm. Sep: 70 mm. Oct: 128 mm. Nov: 94 mm. Dec: 91 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 78%. Feb: 75%. Mar: 71%. Apr: 66%. May: 65%. Jun: 68%. Jul: 72%. Aug: 73%. Sep: 74%. Oct: 74%. Nov: 76%. Dec: 76%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 21 km/h . Mar: 21 km/h . Apr: 21 km/h . May: 18 km/h . Jun: 19 km/h . Jul: 16 km/h . Aug: 16 km/h . Sep: 16 km/h . Oct: 18 km/h . Nov: 20 km/h . Dec: 20 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 6h. Mar: 8h. Apr: 9h. May: 10h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 7h. Nov: 5h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 6. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 17 days. Feb: 15 days. Mar: 10 days. Apr: 4 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 1 days. Nov: 7 days. Dec: 14 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 9 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 27°C | Jul · 27°C |
| Coldest month | Jan 2025 · -13°C | Jan · -12°C |
| Wettest month | Oct 2025 · 141 mm | Oct · 128 mm |
| Windiest month | Feb 2025 · 23 km/h | Feb · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May best
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -4°C / -12°C | -9°C / -17°C | 11days (79 mm) Wet | 5.2h Fair | 78% Humid | 2 Low | Poor | View Details |
| February | -2°C / -11°C | -7°C / -17°C | 12days (80 mm) Wet | 6.3h Fair | 75% Muggy | 3 Moderate | Poor | View Details |
| March | 3°C / -5°C | -1°C / -10°C | 13days (85 mm) Wet | 7.8h Good | 71% Muggy | 4 Moderate | Poor | View Details |
| April | 11°C / 1°C | 8°C / -3°C | 13days (121 mm) Wet | 8.5h Good | 66% Muggy | 4.8 Moderate | Poor | View Details |
| May best | 19°C / 9°C | 18°C / 6°C | 12days (87 mm) Wet | 10.4h Excellent | 65% Muggy | 5.6 High | Good | View Details |
| June best | 24°C / 15°C | 24°C / 14°C | 13days (121 mm) Wet | 10.9h Excellent | 68% Muggy | 6.3 High | Excellent | View Details |
| July best | 27°C / 18°C | 28°C / 19°C | 13days (112 mm) Wet | 11.9h Excellent | 72% Muggy | 6.6 High | Excellent | View Details |
| August best | 25°C / 17°C | 26°C / 18°C | 13days (126 mm) Wet | 10.7h Excellent | 73% Muggy | 5.7 High | Excellent | View Details |
| September best | 21°C / 13°C | 21°C / 13°C | 8days (70 mm) Wet | 9.5h Good | 74% Muggy | 4.9 Moderate | Excellent | View Details |
| October | 15°C / 8°C | 12°C / 5°C | 11days (128 mm) Wet | 6.9h Fair | 74% Muggy | 3.1 Moderate | Fair | View Details |
| November | 6°C / 0°C | 2°C / -5°C | 12days (94 mm) Wet | 5.3h Fair | 76% Humid | 2 Low | Poor | View Details |
| December | -1°C / -8°C | -5°C / -13°C | 12days (91 mm) Wet | 4.7h Fair | 76% Humid | 1.5 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Westmount are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Westmount, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Westmount is July, with average daytime highs of 27°C (80°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Westmount is January, with average overnight lows of -12°C (10°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Westmount is October, averaging 128mm of precipitation across 11 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Westmount runs through March, April, June, July, with the heaviest rainfall in March. Based on 10-year averages for Westmount.
Westmount receives approximately 98 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Westmount.
The least favorable months to visit Westmount are January, February, November, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Westmount is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Westmount is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Westmount receives snow. Months with snowfall average 10 snow days and 21 cm (8 in) of accumulation, with about 20 frost days during winter.
Average wind speeds in Westmount are 19 km/h (12 mph). The windiest month is February with peak winds reaching 21 km/h (13 mph) (gusts up to 40 km/h / 25 mph).
Westmount averages 3 clear-sky days per month with overall cloud cover around 63%. The clearest skies occur in September.
The annual average dew point in Westmount is 3°C (37°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Westmount has a Hot-Summer Continental climate, classified as Dfa under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Westmount ranges from 1°C (34°F) to 10°C (50°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Westmount. It earns a climate score of 8.4/10 with Excellent.
For June in Westmount, pack Umbrella, Waterproof jacket, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 24°C (75°F) and 13 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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