March 21 is generally a great time to visit San Sebastian. While there is a slight chance of rain (24%), showers are usually brief. Expect comfortable 15°C weather. Take advantage of the off-peak calm in San Sebastian to see the sights without the usual crowds.
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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 March 21
"Mild & Comfortable. Expect average highs of 15°C. 24% chance of snow."
What to Wear in San Sebastian in March
Based on historical data for March 21, San Sebastian typically experiences temperatures between 8.3°C and 15°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (24% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for San Sebastian
Smart Suitcase
- Light Jacket
- Long Pants
Average High
15°C
Daytime Peak
Average Low
8.3°C
Nighttime Low
Feels Like
15°C
🌤️ Feels accurate
Snow Chance
24%
Avg 1.9mm if it snows
Snowfall
0.1 cm
~24% chance
Pressure
1018.9 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 85% 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
🔴 32 min to burn
Type III-IV
🟡 48 min to burn
Type V-VI
🟢 80 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
10.6°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
Business Day
Standard hours in Spain
Flight Traffic
Quiet
20/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~6
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Sebastian
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:11
☀️ Noon
13:16
🌇 Sunset
19:21
⏱️ Daylight
12h 10m
Wind Speed
17.7 km/h
Gentle breeze
Sunshine
8.8 hrs
Direct Sun (Cloud-free)
Humidity
75%
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
☀️ Excellent
Tourist Crowds
🟢 Moderate
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 March 21 averages 15°C with a 24% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— 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
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📍 Is San Sebastian Worth Visiting on March 21?
Planning a trip to San Sebastian on March 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 15°C with a 24% historical precipitation risk.
✈️ Travel Logistics: Approximately 6 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 13.6°C (polar plunge). Wave conditions are generally surfers only with heights around 1.26m.
📊 Historical Extremes: The hottest March 21 recorded in the last 30 years saw temperatures hit 20.7°C in 2025, while the coldest dropped to 3.9°C in 2019.