October 21 is generally a great time to visit Key West. While there is a slight chance of rain (27%), showers are usually brief. Expect comfortable 27°C weather. You'll enjoy Key West with reasonable crowd levels and competitive accommodation options.
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Essential Travel Info for Key West
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Key West Weather Forecast for October 21
"Warm & Sunny. Expect average highs of 27.1°C. 27% chance of rain."
What to Wear in Key West in October
Based on historical data for October 21, Key West typically experiences temperatures between 25.4°C and 27.1°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 27% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Key West
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
27.1°C
Daytime Peak
Average Low
25.4°C
Nighttime Low
Feels Like
29.6°C
🔥 Feels warmer
Rain Chance
27%
Avg 2.3mm if it rains
Cloud Cover
48%
Light drizzle
Pressure
1014.7 hPa
Low volatility
Key West Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 90% 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
🔴 44 min to burn
Type III-IV
🟡 66 min to burn
Type V-VI
🟢 110 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
22.5°C
Humid/Sticky
Heat Index
29.6°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
Moderate
56/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~22
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Key West
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:29
☀️ Noon
12:12
🌇 Sunset
17:56
⏱️ Daylight
11h 27m
Wind Speed
28.4 km/h
Moderate wind
Sunshine
9.3 hrs
Direct Sun (Cloud-free)
Humidity
76%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Key West
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Key West
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
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, Key West on October 21 averages 27.1°C with a 27% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Key West 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 (October 21) in other destinations
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📍 Is Key West Worth Visiting on October 21?
Planning a trip to Key West on October 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 27.1°C with a 27% historical precipitation risk.
✈️ Travel Logistics: Approximately 22 landing slots available daily during this period, indicating manageable crowd levels.
🌊 Coastal Conditions: Water temperature averages 28.1°C (tropical bath). Wave conditions are generally fun waves with heights around 1.11m.
📊 Historical Extremes: The hottest October 21 recorded in the last 30 years saw temperatures hit 28.8°C in 2019, while the coldest dropped to 22.8°C in 2022.