Key West · AutumnMonth summary
Key West weather in September
✅ Good
🌡️ Temperature min / max
27°C – 29°C
🌧 Rainy days
65% of days
☀️ Sunshine
11.4h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.3/10
📅 📅 Best month
April (8.7/10)
Quick decision
Should you visit Key West in September?
✅ Good
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: Favourable conditions in September (7.3/10). April scores higher but the gap is small.
By trip type
Key West in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : ✅ Low season
Local context
What to expect in September
🎯 Diving still possible despite rain — underwater visibility stays decent at depth Autumn in Key West is often underrated: 29°C, golden light and declining crowds. An interesting window. With 65% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. April (8.7/10) is significantly better if possible.
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All months for Key West
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 20°C | 23°C | 25% | 1.6 | 10.2h | 7.9/10 |
| 🌤️ February | 22°C | 24°C | 21% | 1.2 | 10.9h | 8.2/10 |
| ☀️ March | 23°C | 25°C | 14% | 1.3 | 11.3h | 8.6/10 |
| ☀️ April | 24°C | 26°C | 23% | 1.3 | 12.5h | 8.7/10 |
| 🌤️ May | 26°C | 27°C | 35% | 3.1 | 12.9h | 8.4/10 |
| 🌤️ June | 27°C | 29°C | 55% | 4.8 | 12.9h | 7.7/10 |
| 🌤️ July | 28°C | 30°C | 53% | 3.2 | 13.0h | 7.6/10 |
| 🌤️ August | 28°C | 30°C | 59% | 4.4 | 12.5h | 7.4/10 |
| ⛅ September | 27°C | 29°C | 65% | 5.9 | 11.4h | 7.3/10 |
| 🌤️ October | 26°C | 28°C | 55% | 4.3 | 10.9h | 7.6/10 |
| 🌤️ November | 24°C | 26°C | 28% | 2.5 | 10.4h | 8.1/10 |
| 🌤️ December | 22°C | 24°C | 22% | 2.0 | 10.4h | 8.1/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Key West averages 29°C, 65% rainy days and 11.4h of sunshine per day. Overall weather score: 7.3/10.
See methodology →
Comparison
September vs April (best month)
The best month is April (score 8.7/10). Difference:
- 🌡️ Max temperature : -3°C
- 🌧 Rainy days : -42%
- ☀️ Sunshine : +1.1h/day
FAQ
FAQ — Key West in September
Is September a good time to visit Key West?
September is an acceptable time for Key West (score 7.3/10). Conditions are decent but not optimal — consider April (8.7/10) if possible.
Does it rain a lot in Key West in September?
Yes, 65% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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Activities & tours
Activities and tours in Key West
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