October 21 is generally a great time to visit Ottawa. While there is a slight chance of rain (30%), showers are usually brief. Expect comfortable 13°C weather. Expect a bustling atmosphere in Ottawa right now—this is when the city truly comes alive with visitors.
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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 October 21
"Mild & Comfortable. Expect average highs of 12.7°C. 30% chance of rain."
What to Wear in Ottawa in October
Based on historical data for October 21, Ottawa typically experiences temperatures between 5.3°C and 12.7°C. We recommend packing heavy coat, scarf, gloves along with other layers to stay comfortable. With a 30% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Ottawa
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
- Umbrella
Average High
12.7°C
Daytime Peak
Average Low
5.3°C
Nighttime Low
Feels Like
11.9°C
🌤️ Feels accurate
Rain Chance
30%
Avg 2.4mm if it rains
Cloud Cover
68%
Overcast
Pressure
1014.3 hPa
High 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 15 for extended outdoor time
Type I-II
🔴 73 min to burn
Type III-IV
🟡 110 min to burn
Type V-VI
🟢 183 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
8.8°C
Dry air
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
89/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~157
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Ottawa
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:27
☀️ Noon
11:48
🌇 Sunset
17:09
⏱️ Daylight
10h 41m
Wind Speed
17.2 km/h
Gentle breeze
Sunshine
5.9 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Ottawa
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Ottawa
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Rapid pressure changes detected. High risk for meteosensitive people.
Weather unlikely to affect joint pain.
Fish are active due to pressure changes.
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 October 21 averages 12.7°C with a 30% precipitation probability. Wedding/Outdoor Event Score: 76/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
October 14
14.5°C • 27% rain
Score
88
October 15
13.8°C • 31% rain
Score
82
October 16
13.1°C • 28% rain
Score
80
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (October 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Ottawa Worth Visiting on October 21?
Planning a trip to Ottawa on October 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 12.7°C with a 30% historical precipitation risk.
✈️ Travel Logistics: Approximately 157 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 October 21 recorded in the last 30 years saw temperatures hit 22.2°C in 2024, while the coldest dropped to 1.1°C in 2018.