August 15 is generally a great time to visit Nantucket. While there is a slight chance of rain (23%), showers are usually brief. Expect comfortable 22°C weather. As it's peak season for Nantucket, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Nantucket
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Nantucket Weather Forecast for August 15
"Mild & Comfortable. Expect average highs of 21.6°C. 23% chance of rain."
What to Wear in Nantucket in August
Based on historical data for August 15, Nantucket typically experiences temperatures between 20.1°C and 21.6°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (23% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Nantucket
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
21.6°C
Daytime Peak
Average Low
20.1°C
Nighttime Low
Feels Like
22°C
☀️ Feels accurate
Rain Chance
23%
Avg 2.1mm if it rains
Cloud Cover
56%
Overcast
Pressure
1015.8 hPa
Low volatility
Nantucket Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
04:00 - 09:30
16:00 - 18:00
Type I-II
🔴 20 min to burn
Type III-IV
🟡 30 min to burn
Type V-VI
🟢 50 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19.5°C
Noticeable
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
High
100/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~142
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Nantucket
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:50
☀️ Noon
11:46
🌇 Sunset
18:41
⏱️ Daylight
13h 50m
Wind Speed
25.4 km/h
Moderate wind
Sunshine
10.4 hrs
Direct Sun (Cloud-free)
Humidity
88%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Nantucket
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 Nantucket
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
Atlantic Hurricane Risk
Season: Jun - Nov
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Nantucket on August 15 averages 21.6°C with a 23% precipitation probability. Wedding/Outdoor Event Score: 92/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Nantucket 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 (August 15) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Nantucket Worth Visiting on August 15?
Planning a trip to Nantucket on August 15? 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 21.6°C with a 23% historical precipitation risk.
✈️ Travel Logistics: Approximately 142 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest August 15 recorded in the last 30 years saw temperatures hit 24.4°C in 2016, while the coldest dropped to 18.9°C in 2017.