September 18 is generally a great time to visit Bilbao. While there is a slight chance of rain (21%), showers are usually brief. Expect comfortable 23°C weather. As it's peak season for Bilbao, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Bilbao
Currency
EUR
€ Euro
Language
Spanish
+3 more
Driving
Right side
Connect
As of June 2022, Bilbao has 5G from all ...
Safety
High Safety
GPI: 1.603
Bilbao Weather Forecast for September 18
"Mild & Comfortable. Expect average highs of 22.9°C. 21% chance of rain."
What to Wear in Bilbao in September
Based on historical data for September 18, Bilbao typically experiences temperatures between 15.1°C and 22.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (21% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Bilbao
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
22.9°C
Daytime Peak
Average Low
15.1°C
Nighttime Low
Feels Like
23.4°C
☀️ Feels accurate
Rain Chance
21%
Avg 1.4mm if it rains
Cloud Cover
56%
Light drizzle
Pressure
1017.1 hPa
Medium volatility
Bilbao 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 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
18.6°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
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~187
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Bilbao
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:55
☀️ Noon
13:07
🌇 Sunset
19:19
⏱️ Daylight
12h 23m
Wind Speed
14.5 km/h
Gentle breeze
Sunshine
9.6 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Bilbao
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 Bilbao
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
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, Bilbao on September 18 averages 22.9°C with a 21% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Bilbao Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (September 18) in other destinations
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📍 Is Bilbao Worth Visiting on September 18?
Planning a trip to Bilbao on September 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 21% historical precipitation risk.
✈️ Travel Logistics: Approximately 187 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°C (swimming pool). Wave conditions are generally fun waves with heights around 1.17m.
📊 Historical Extremes: The hottest September 18 recorded in the last 30 years saw temperatures hit 34.1°C in 2025, while the coldest dropped to 11.4°C in 2024.