August 18 is generally a great time to visit Calgary. While there is a slight chance of rain (16%), showers are usually brief. Expect comfortable 23°C weather. Calgary is currently in its most popular travel window, meaning vibrant crowds and premium pricing. Note: August 18 is Discovery Day in Calgary, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Calgary
Currency
CAD
$ Canadian dollar
Language
English
+1 more
Driving
Right side
Connect
The area codes in Calgary are403and587, ...
Safety
Very High Safety
GPI: 1.389
Calgary Weather Forecast for August 18
"Mild & Comfortable. Expect average highs of 22.9°C. 16% chance of rain."
What to Wear in Calgary in August
Based on historical data for August 18, Calgary typically experiences temperatures between 10.4°C and 22.9°C. We recommend packing light jacket, long pants, layers (onion system) to stay comfortable. Trends suggest it will stay mostly dry (16% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Calgary
Smart Suitcase
- Light Jacket
- Long Pants
- Layers (Onion System)
Average High
22.9°C
Daytime Peak
Average Low
10.4°C
Nighttime Low
Feels Like
23.2°C
☀️ Feels accurate
Rain Chance
16%
Avg 0.8mm if it rains
Cloud Cover
44%
Overcast
Pressure
1013.2 hPa
Medium volatility
Calgary 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 - 19:00
Type I-II
🔴 19 min to burn
Type III-IV
🟡 29 min to burn
Type V-VI
🟢 48 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Holiday
Discovery Day
Flight Traffic
High
90/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~266
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Calgary
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:29
☀️ Noon
12:41
🌇 Sunset
19:53
⏱️ Daylight
14h 24m
Wind Speed
14.3 km/h
Gentle breeze
Sunshine
11.5 hrs
Direct Sun (Cloud-free)
Humidity
65%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Calgary
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Calgary
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
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Calgary on August 18 averages 22.9°C with a 16% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Calgary Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (August 18) in other destinations
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📍 Is Calgary Worth Visiting on August 18?
Planning a trip to Calgary on August 18? 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 22.9°C with a 16% historical precipitation risk.
🎉 Local Event: The date coincides with Discovery Day, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 266 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 18 recorded in the last 30 years saw temperatures hit 32.3°C in 2020, while the coldest dropped to 7.2°C in 2021.