Historical data suggests significant rain risk (74%) on September 21. If you seek sun, consider a different date. Bring rain gear! Lower tourist interest in Juneau right now translates to better deals and a more local feel.
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Essential Travel Info for Juneau
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Juneau Weather Forecast for September 21
"Rainy & Overcast. Expect average highs of 12.3°C. 74% chance of rain."
What to Wear in Juneau in September
Based on historical data for September 21, Juneau typically experiences temperatures between 7.8°C and 12.3°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 74% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Juneau
Smart Suitcase
- Light Jacket
- Long Pants
- Umbrella
Average High
12.3°C
Daytime Peak
Average Low
7.8°C
Nighttime Low
Feels Like
11.7°C
🌤️ Feels accurate
Rain Chance
74%
Avg 12.4mm if it rains
Cloud Cover
86%
Moderate rain
Pressure
1010 hPa
High volatility
Juneau Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% 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
🔴 62 min to burn
Type III-IV
🟡 93 min to burn
Type V-VI
🟢 155 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
10.5°C
Pleasant
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
Quiet
26/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~15
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Juneau
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:41
☀️ Noon
11:52
🌇 Sunset
18:02
⏱️ Daylight
12h 20m
Wind Speed
10.9 km/h
Light breeze
Sunshine
4.1 hrs
Direct Sun (Cloud-free)
Humidity
89%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Juneau
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 Juneau
Travel Comfort Index
Real-time tourism conditions
Weather Quality
🌧️ Variable
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Rapid pressure changes detected. High risk for meteosensitive people.
Mild discomfort possible for arthritic conditions.
Fish are active due to pressure changes.
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, Juneau on September 21 averages 12.3°C with a 74% precipitation probability. Wedding/Outdoor Event Score: 46/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Juneau Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 14
13.8°C • 57% rain
Score
70
September 15
13.7°C • 58% rain
Score
69
September 16
13.7°C • 59% rain
Score
67
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 21) in other destinations
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Rome
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United Kingdom
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🌍 Explore the same date in different destinations around the world
📍 Is Juneau Worth Visiting on September 21?
Planning a trip to Juneau on September 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 12.3°C with a 74% historical precipitation risk.
✈️ Travel Logistics: Approximately 15 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest September 21 recorded in the last 30 years saw temperatures hit 16.2°C in 2018, while the coldest dropped to 4.6°C in 2018.