September 19 is generally a great time to visit San Sebastian. While there is a slight chance of rain (29%), showers are usually brief. Expect comfortable 22°C weather. Expect a bustling atmosphere in San Sebastian right now—this is when the city truly comes alive with visitors.
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Essential Travel Info for San Sebastian
Currency
EUR
€ Euro
Language
Spanish
+3 more
Driving
Right side
Safety
High Safety
GPI: 1.603
San Sebastian Weather Forecast for September 19
"Mild & Comfortable. Expect average highs of 22.1°C. 29% chance of rain."
What to Wear in San Sebastian in September
Based on historical data for September 19, San Sebastian typically experiences temperatures between 15.1°C and 22.1°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 29% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for San Sebastian
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
22.1°C
Daytime Peak
Average Low
15.1°C
Nighttime Low
Feels Like
22.5°C
☀️ Feels accurate
Rain Chance
29%
Avg 2.2mm if it rains
Cloud Cover
54%
Overcast
Pressure
1017 hPa
Medium volatility
San Sebastian Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 75% 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
🔴 30 min to burn
Type III-IV
🟡 45 min to burn
Type V-VI
🟢 75 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
18.1°C
Noticeable
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 Spain
Flight Traffic
High
97/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~29
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Sebastian
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:52
☀️ Noon
13:03
🌇 Sunset
19:13
⏱️ Daylight
12h 20m
Wind Speed
13.7 km/h
Gentle breeze
Sunshine
9.4 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for San Sebastian
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in San Sebastian
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 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 excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, San Sebastian on September 19 averages 22.1°C with a 29% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
San Sebastian Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (September 19) in other destinations
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📍 Is San Sebastian Worth Visiting on September 19?
Planning a trip to San Sebastian on September 19? 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 22.1°C with a 29% historical precipitation risk.
✈️ Travel Logistics: Approximately 29 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Spain, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 21.8°C (swimming pool). Wave conditions are generally fun waves with heights around 1.05m.
📊 Historical Extremes: The hottest September 19 recorded in the last 30 years saw temperatures hit 33.4°C in 2025, while the coldest dropped to 10.8°C in 2017.