August 25 is generally a great time to visit Ottawa. While there is a slight chance of rain (19%), showers are usually brief. Expect comfortable 24°C weather. Ottawa is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Ottawa
Currency
CAD
$ Canadian dollar
Language
English
+1 more
Driving
Right side
Connect
The area codes for Ottawa are613and the ...
Safety
Very High Safety
GPI: 1.389
Ottawa Weather Forecast for August 25
"Mild & Comfortable. Expect average highs of 24.2°C. 19% chance of rain."
What to Wear in Ottawa in August
Based on historical data for August 25, Ottawa typically experiences temperatures between 15.4°C and 24.2°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (19% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Ottawa
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
24.2°C
Daytime Peak
Average Low
15.4°C
Nighttime Low
Feels Like
24.9°C
☀️ Feels accurate
Rain Chance
19%
Avg 1.2mm if it rains
Cloud Cover
52%
Overcast
Pressure
1016 hPa
Medium volatility
Ottawa Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 20 min to burn
Type III-IV
🟡 30 min to burn
Type V-VI
🟢 50 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19.3°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Canada
Flight Traffic
High
98/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~173
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Ottawa
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:17
☀️ Noon
12:06
🌇 Sunset
18:55
⏱️ Daylight
13h 38m
Wind Speed
13.1 km/h
Gentle breeze
Sunshine
10.4 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Ottawa
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Ottawa
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Ottawa on August 25 averages 24.2°C with a 19% precipitation probability. Wedding/Outdoor Event Score: 99/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Ottawa Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (August 25) in other destinations
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📍 Is Ottawa Worth Visiting on August 25?
Planning a trip to Ottawa on August 25? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 24.2°C with a 19% historical precipitation risk.
✈️ Travel Logistics: Approximately 173 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 6 vaccinations are recommended for Canada, including COVID-19.
📊 Historical Extremes: The hottest August 25 recorded in the last 30 years saw temperatures hit 32.3°C in 2021, while the coldest dropped to 12.3°C in 2017.