April 18 is generally a great time to visit San Sebastian. While there is a slight chance of rain (38%), showers are usually brief. Expect comfortable 16°C weather. San Sebastian is very peaceful this time of year, perfect for a secluded and budget-friendly getaway. Note: April 18 is Good Friday in San Sebastian, so expect special events, closures, and festive atmosphere.
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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 April 18
"Mild & Comfortable. Expect average highs of 15.8°C. 38% chance of rain."
What to Wear in San Sebastian in April
Based on historical data for April 18, San Sebastian typically experiences temperatures between 9.2°C and 15.8°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 38% 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
- Light Jacket
- Long Pants
- Umbrella
Average High
15.8°C
Daytime Peak
Average Low
9.2°C
Nighttime Low
Feels Like
15.8°C
🌤️ Feels accurate
Rain Chance
38%
Avg 2.9mm if it rains
Cloud Cover
65%
Overcast
Pressure
1016.1 hPa
Medium volatility
San Sebastian 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
06:00 - 10:00
16:00 - 19:00
Type I-II
🔴 22 min to burn
Type III-IV
🟡 33 min to burn
Type V-VI
🟢 55 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
11.8°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
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Holiday
Good Friday
Flight Traffic
Minimal
17/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~5
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Sebastian
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:22
☀️ Noon
13:08
🌇 Sunset
19:54
⏱️ Daylight
13h 32m
Wind Speed
16.4 km/h
Gentle breeze
Sunshine
9.2 hrs
Direct Sun (Cloud-free)
Humidity
77%
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
💰💰 Moderate
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 April 18 averages 15.8°C with a 38% precipitation probability. Wedding/Outdoor Event Score: 80/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
April 22
16.8°C • 37% rain
Score
84
April 23
17.1°C • 37% rain
Score
84
April 15
15.9°C • 37% rain
Score
81
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (April 18) in other destinations
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🌍 Explore the same date in different destinations around the world
📍 Is San Sebastian Worth Visiting on April 18?
Planning a trip to San Sebastian on April 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 15.8°C with a 38% historical precipitation risk.
🎉 Local Event: The date coincides with Good Friday, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 5 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 14.4°C (polar plunge). Wave conditions are generally surfers only with heights around 1.39m.
📊 Historical Extremes: The hottest April 18 recorded in the last 30 years saw temperatures hit 27.2°C in 2018, while the coldest dropped to 6.4°C in 2016.