Wellesley, Canada experiences average highs of 13°C (55°F) and lows of 5°C (41°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Average highs have cooled by 1.1°C (2.0°F) across the available records.
Wellesley, Canada Weather & Climate 2026
Monthly climate averages for Wellesley, Canada. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Oct 
Wetter season: Apr–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.7/10
Best: May, June, July, August, September
UV Index
4
Low
Temperature 13°C / 5°C
Feels Like 10°C / 1°C
Rainy Days 12
Rainfall 81 mm
Sunshine 8 h
Humidity 74%
Wind Speed 20 km/h
Dew Point 4°C
Snow Days 11 days
Frost Days 17 days
Hottest Month
26°C
July
Avg Low 17°C
Rain 12 days
Coldest Month
-8°C
January
Avg High -2°C
Rain 12 days
Driest Month
9 days
September
Avg High 22°C
Avg Low 13°C
Windiest Month
23 km/h
February (Gusts 46)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:56
Daylight 15.1h
Sunset 21:02
Live conditions —
Wellesley on the map · live conditions
Wellesley, Canada
- Continent
- Americas
- Country
- Canada
- City
- Wellesley
- Population
- 3.2K
- Coordinates
- 43.48°, -80.76°
Seasonal Breakdown
Spring
Mar–May
Avg High 12°C
Avg Low 2°C
Rain 12 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 25°C
Avg Low 16°C
Rain 11 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 14°C
Avg Low 7°C
Rain 11 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 0°C
Avg Low -7°C
Rain 13 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: -2°C / -8°C . Feb: 0°C / -8°C . Mar: 5°C / -3°C . Apr: 11°C / 2°C . May: 18°C / 9°C . Jun: 24°C / 14°C . Jul: 26°C / 17°C . Aug: 25°C / 16°C . Sep: 22°C / 13°C . Oct: 15°C / 7°C . Nov: 7°C / 0°C . Dec: 1°C / -4°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 76 mm. Feb: 72 mm. Mar: 83 mm. Apr: 97 mm. May: 75 mm. Jun: 97 mm. Jul: 82 mm. Aug: 91 mm. Sep: 65 mm. Oct: 83 mm. Nov: 69 mm. Dec: 81 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 80%. Feb: 77%. Mar: 71%. Apr: 68%. May: 68%. Jun: 68%. Jul: 71%. Aug: 75%. Sep: 75%. Oct: 77%. Nov: 78%. Dec: 81%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 21 km/h . Feb: 23 km/h . Mar: 22 km/h . Apr: 22 km/h . May: 19 km/h . Jun: 18 km/h . Jul: 16 km/h . Aug: 16 km/h . Sep: 17 km/h . Oct: 20 km/h . Nov: 21 km/h . Dec: 22 km/h .
Sunshine
Sunshine
Sunshine: Jan: 4h. Feb: 6h. Mar: 7h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 7h. Nov: 5h. Dec: 4h.
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 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow Days Snowfall
Snow Days: Jan: 19 days. Feb: 15 days. Mar: 11 days. Apr: 6 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 9 days. Dec: 16 days.
Climate Trends
Average highs have cooled by 1.1°C (2.0°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 27°C | Jul · 26°C |
| Coldest month | Jan 2025 · -10°C | Jan · -8°C |
| Wettest month | Dec 2025 · 112 mm | Apr · 97 mm |
| Windiest month | Mar 2025 · 24 km/h | Feb · 23 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 | -2°C / -8°C | -7°C / -13°C | 12days (76 mm) Wet | 4.4h Fair | 80% Humid | 2.3 Moderate | Poor | View Details |
| February | 0°C / -8°C | -5°C / -13°C | 12days (72 mm) Wet | 6.1h Fair | 77% Humid | 3.3 Moderate | Poor | View Details |
| March | 5°C / -3°C | 1°C / -8°C | 12days (83 mm) Wet | 7.4h Good | 71% Muggy | 4.1 Moderate | Poor | View Details |
| April | 11°C / 2°C | 8°C / -3°C | 14days (97 mm) Wet | 8.6h Good | 68% Muggy | 5 Moderate | Poor | View Details |
| May best | 18°C / 9°C | 17°C / 6°C | 11days (75 mm) Wet | 10.4h Excellent | 68% Muggy | 6 High | Good | View Details |
| June best | 24°C / 14°C | 24°C / 13°C | 11days (97 mm) Wet | 11.9h Excellent | 68% Muggy | 6.6 High | Excellent | View Details |
| July best | 26°C / 17°C | 27°C / 17°C | 12days (82 mm) Wet | 11.9h Excellent | 71% Muggy | 6.7 High | Excellent | View Details |
| August best | 25°C / 16°C | 26°C / 17°C | 11days (91 mm) Wet | 10.9h Excellent | 75% Muggy | 6 High | Excellent | View Details |
| September best | 22°C / 13°C | 21°C / 12°C | 9days (65 mm) Wet | 9.4h Good | 75% Muggy | 5.1 High | Excellent | View Details |
| October | 15°C / 7°C | 12°C / 5°C | 12days (83 mm) Wet | 6.8h Fair | 77% Humid | 3.4 Moderate | Fair | View Details |
| November | 7°C / 0°C | 3°C / -4°C | 13days (69 mm) Wet | 5.4h Fair | 78% Humid | 2.2 Moderate | Poor | View Details |
| December | 1°C / -4°C | -3°C / -10°C | 14days (81 mm) Wet | 3.8h Poor | 81% Humid | 1.7 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Wellesley 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 Wellesley, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Wellesley is July, with average daytime highs of 26°C (79°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Wellesley is January, with average overnight lows of -8°C (18°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Wellesley is April, averaging 97mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Wellesley runs through April, December, November, January, with the heaviest rainfall in April. Based on 10-year averages for Wellesley.
Wellesley receives approximately 97 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Wellesley.
The least favorable months to visit Wellesley 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 Wellesley is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Wellesley is 74%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Wellesley receives snow. Months with snowfall average 11 snow days and 19 cm (7 in) of accumulation, with about 17 frost days during winter.
Average wind speeds in Wellesley are 20 km/h (12 mph). The windiest month is February with peak winds reaching 23 km/h (14 mph) (gusts up to 46 km/h / 28 mph).
Wellesley averages 3 clear-sky days per month with overall cloud cover around 66%. The clearest skies occur in September.
The annual average dew point in Wellesley is 4°C (39°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Wellesley has a Warm-Summer Continental climate, classified as Dfb under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Wellesley 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, July is a great time to visit Wellesley. It earns a climate score of 8.6/10 with Excellent.
For July in Wellesley, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 26°C (79°F) and 12 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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