September 15 is generally a great time to visit Riga. While there is a slight chance of rain (27%), showers are usually brief. Expect comfortable 17°C weather. You'll find plenty of company in Riga this month as tourism activity remains quite robust.
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Essential Travel Info for Riga
Currency
EUR
€ Euro
Language
Latvian
Driving
Right side
Safety
High Safety
GPI: 1.673
Riga Weather Forecast for September 15
"Mild & Comfortable. Expect average highs of 17.2°C. 27% chance of rain."
What to Wear in Riga in September
Based on historical data for September 15, Riga typically experiences temperatures between 10.9°C and 17.2°C. We recommend packing light jacket, long pants to stay comfortable. With a 27% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Riga
Smart Suitcase
- Light Jacket
- Long Pants
Average High
17.2°C
Daytime Peak
Average Low
10.9°C
Nighttime Low
Feels Like
17.2°C
🌤️ Feels accurate
Rain Chance
27%
Avg 1.4mm if it rains
Cloud Cover
64%
Light drizzle
Pressure
1013.1 hPa
High volatility
Riga Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 95% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 44 min to burn
Type III-IV
🟡 66 min to burn
Type V-VI
🟢 110 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
13.5°C
Pleasant
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Latvia
Flight Traffic
Busy
71/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~153
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Riga
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:55
☀️ Noon
12:20
🌇 Sunset
18:45
⏱️ Daylight
12h 50m
Wind Speed
21.3 km/h
Moderate wind
Sunshine
8.2 hrs
Direct Sun (Cloud-free)
Humidity
79%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Riga
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Riga
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
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 excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Riga on September 15 averages 17.2°C with a 27% precipitation probability. Wedding/Outdoor Event Score: 89/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Riga Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 8
19.5°C • 20% rain
Score
96
September 9
19.4°C • 18% rain
Score
96
September 10
19.2°C • 23% rain
Score
94
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 15) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Riga Worth Visiting on September 15?
Planning a trip to Riga on September 15? 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 17.2°C with a 27% historical precipitation risk.
✈️ Travel Logistics: Approximately 153 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Latvia, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 18.9°C (refreshing tonic). Wave conditions are generally lake-like with heights around 0m.
📊 Historical Extremes: The hottest September 15 recorded in the last 30 years saw temperatures hit 21.2°C in 2020, while the coldest dropped to 6.3°C in 2021.