September 4 sees frequent showers in Reykjavik. Historical data shows a 46% chance of rain, so pack accordingly. Temperatures average 13°C. It's a quieter period for Reykjavik, ideal for those who prefer unhurried sightseeing.
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Essential Travel Info for Reykjavik
Currency
ISK
kr Icelandic króna
Language
Icelandic
Driving
Right side
Safety
Very High Safety
GPI: 1.107
Reykjavik Weather Forecast for September 4
"Mild & Comfortable. Expect average highs of 12.6°C. 46% chance of rain."
What to Wear in Reykjavik in September
Based on historical data for September 4, Reykjavik typically experiences temperatures between 7.4°C and 12.6°C. We recommend packing heavy coat, scarf, gloves along with other layers to stay comfortable. With a 46% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Reykjavik
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
- Umbrella
Average High
12.6°C
Daytime Peak
Average Low
7.4°C
Nighttime Low
Feels Like
11.6°C
🌤️ Minor difference
Rain Chance
46%
Avg 2.9mm if it rains
Cloud Cover
75%
Light drizzle
Pressure
1005.4 hPa
High volatility
Reykjavik Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 89% 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
🔴 67 min to burn
Type III-IV
🟡 101 min to burn
Type V-VI
🟢 168 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°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 Iceland
Flight Traffic
Quiet
39/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~43
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Reykjavik
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:19
☀️ Noon
13:28
🌇 Sunset
20:37
⏱️ Daylight
14h 17m
Wind Speed
20.9 km/h
Moderate wind
Sunshine
7.9 hrs
Direct Sun (Cloud-free)
Humidity
84%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Reykjavik
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Reykjavik
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.
Low pressure & humidity may aggravate joints.
Fish are active due to pressure changes.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Reykjavik on September 4 averages 12.6°C with a 46% precipitation probability. Wedding/Outdoor Event Score: 70/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Reykjavik Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 4) in other destinations
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📍 Is Reykjavik Worth Visiting on September 4?
Planning a trip to Reykjavik on September 4? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 12.6°C with a 46% historical precipitation risk.
✈️ Travel Logistics: Approximately 43 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 6 vaccinations are recommended for Iceland, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 11.9°C (polar plunge). Wave conditions are generally surfers only with heights around 1.46m.
📊 Historical Extremes: The hottest September 4 recorded in the last 30 years saw temperatures hit 14.3°C in 2017, while the coldest dropped to 3.8°C in 2024.