Ottawa, 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.
Ottawa, Canada Weather & Climate 2026
Monthly climate averages for Ottawa, Canada. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Jun 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 92 mm
Sunshine 8 h
Humidity 73%
Wind Speed 16 km/h
Dew Point 3°C
Snow Days 9 days
Frost Days 18 days
Hottest Month
27°C
July
Avg Low18°C
Rain12days
Coldest Month
-12°C
January
Avg High-3°C
Rain11days
Driest Month
8days
September
Avg High22°C
Avg Low13°C
Windiest Month
18 km/h
April (Gusts 41)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:15
Daylight 15.6h
Sunset 20:54
Live conditions—
Ottawa on the map · live conditions
Ottawa, Canada
- Continent
- Americas
- Country
- Canada
- City
- Ottawa
- Population
- 1M
- Coordinates
- 45.41°, -75.70°
Seasonal Breakdown
Spring
Mar–May
Avg High 11°C
Avg Low 1°C
Rain 12 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 25°C
Avg Low 16°C
Rain 12 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 -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: -3°C / -12°C . Feb: -1°C / -11°C . Mar: 4°C / -5°C . Apr: 11°C / 1°C . May: 19°C / 8°C . Jun: 24°C / 14°C . Jul: 27°C / 18°C . Aug: 25°C / 17°C . Sep: 22°C / 13°C . Oct: 15°C / 7°C . Nov: 6°C / 0°C . Dec: 0°C / -7°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 75 mm. Feb: 78 mm. Mar: 88 mm. Apr: 111 mm. May: 97 mm. Jun: 101 mm. Jul: 106 mm. Aug: 105 mm. Sep: 67 mm. Oct: 109 mm. Nov: 81 mm. Dec: 87 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 77%. Feb: 74%. Mar: 71%. Apr: 65%. May: 66%. Jun: 69%. Jul: 71%. Aug: 75%. Sep: 75%. Oct: 76%. Nov: 78%. Dec: 78%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 17 km/h . Feb: 18 km/h . Mar: 18 km/h . Apr: 18 km/h . May: 16 km/h . Jun: 15 km/h . Jul: 14 km/h . Aug: 14 km/h . Sep: 14 km/h . Oct: 16 km/h . Nov: 18 km/h . Dec: 17 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 6h. Mar: 7h. Apr: 8h. May: 10h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 6h. 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 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: 16 days. Mar: 11 days. Apr: 5 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 1 days. Nov: 9 days. Dec: 15 days.
Climate Trends
Average highs have stayed broadly stable 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 · 28°C | Jul · 27°C |
| Coldest month | Feb 2025 · -13°C | Jan · -12°C |
| Wettest month | Apr 2025 · 121 mm | Apr · 111 mm |
| Windiest month | Dec 2025 · 20 km/h | Apr · 18 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 | -3°C / -12°C | -8°C / -17°C | 11days (75 mm) Wet | 4.8h Fair | 77% Humid | 1.9 Low | Poor | View Details |
| February | -1°C / -11°C | -6°C / -16°C | 12days (78 mm) Wet | 5.9h Fair | 74% Muggy | 3 Moderate | Poor | View Details |
| March | 4°C / -5°C | -1°C / -10°C | 12days (88 mm) Wet | 7.4h Good | 71% Muggy | 3.9 Moderate | Poor | View Details |
| April | 11°C / 1°C | 8°C / -3°C | 12days (111 mm) Wet | 8.3h Good | 65% Muggy | 4.6 Moderate | Poor | View Details |
| May best | 19°C / 8°C | 18°C / 6°C | 12days (97 mm) Wet | 10.2h Excellent | 66% Muggy | 5.6 High | Good | View Details |
| June best | 24°C / 14°C | 24°C / 13°C | 13days (101 mm) Wet | 10.9h Excellent | 69% Muggy | 6.3 High | Excellent | View Details |
| July best | 27°C / 18°C | 28°C / 18°C | 12days (106 mm) Wet | 11.9h Excellent | 71% Muggy | 6.5 High | Excellent | View Details |
| August best | 25°C / 17°C | 27°C / 17°C | 12days (105 mm) Wet | 10.5h Excellent | 75% Muggy | 5.7 High | Excellent | View Details |
| September best | 22°C / 13°C | 22°C / 12°C | 8days (67 mm) Wet | 9.2h Good | 75% Muggy | 4.8 Moderate | Excellent | View Details |
| October | 15°C / 7°C | 12°C / 5°C | 12days (109 mm) Wet | 6.4h Fair | 76% Humid | 3.1 Moderate | Fair | View Details |
| November | 6°C / 0°C | 2°C / -5°C | 12days (81 mm) Wet | 4.7h Fair | 78% Humid | 2 Low | Poor | View Details |
| December | 0°C / -7°C | -5°C / -12°C | 12days (87 mm) Wet | 3.8h Poor | 78% Humid | 1.5 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Ottawa 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 Ottawa, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Ottawa 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 Ottawa is January, with average overnight lows of -12°C (11°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Ottawa is April, averaging 111mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Ottawa runs through June, February, March, April, with the heaviest rainfall in June. Based on 10-year averages for Ottawa.
Ottawa receives approximately 94 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Ottawa.
The least favorable months to visit Ottawa 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 Ottawa is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Ottawa is 73%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Ottawa receives snow. Months with snowfall average 9 snow days and 20 cm (8 in) of accumulation, with about 18 frost days during winter.
Average wind speeds in Ottawa are 16 km/h (10 mph). The windiest month is April with peak winds reaching 18 km/h (11 mph) (gusts up to 41 km/h / 25 mph).
Ottawa 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 Ottawa is 3°C (37°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Ottawa 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 Ottawa 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 Ottawa. It earns a climate score of 8.3/10 with Excellent.
For June in Ottawa, 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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