Key West · AutumnMonth summary
Key West weather in September
✅ Good
🌡️ Temperature min / max
81°F – 84°F
🌧 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: September is a good time to visit Key West. April remains slightly better (+1.4 pts).
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
Autumn in Key West is often underrated: 29°F, 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 °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 68°F | 73°F | 25% | 0.1in | 10.2h | 7.9/10 |
| 🌤️ February | 72°F | 75°F | 21% | 0.0in | 10.9h | 8.2/10 |
| ☀️ March | 73°F | 77°F | 14% | 0.1in | 11.3h | 8.6/10 |
| ☀️ April | 75°F | 79°F | 23% | 0.1in | 12.5h | 8.7/10 |
| 🌤️ May | 79°F | 81°F | 35% | 0.1in | 12.9h | 8.4/10 |
| 🌤️ June | 81°F | 84°F | 55% | 0.2in | 12.9h | 7.7/10 |
| 🌤️ July | 82°F | 86°F | 53% | 0.1in | 13.0h | 7.6/10 |
| 🌤️ August | 82°F | 86°F | 59% | 0.2in | 12.5h | 7.4/10 |
| ⛅ September | 81°F | 84°F | 65% | 0.2in | 11.4h | 7.3/10 |
| 🌤️ October | 79°F | 82°F | 55% | 0.2in | 10.9h | 7.6/10 |
| 🌤️ November | 75°F | 79°F | 28% | 0.1in | 10.4h | 8.1/10 |
| 🌤️ December | 72°F | 75°F | 22% | 0.1in | 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 84°F, 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°F
- 🌧 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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