September 21 is generally a great time to visit Rome. While there is a slight chance of rain (28%), showers are usually brief. Expect comfortable 25°C weather. Rome is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Rome Weather Forecast for September 21
"Warm & Sunny. Expect average highs of 25.1°C. 28% chance of rain."
What to Wear in Rome in September
Based on historical data for September 21, Rome typically experiences temperatures between 15.8°C and 25.1°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 28% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Rome
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
25.1°C
Daytime Peak
Average Low
15.8°C
Nighttime Low
Feels Like
25.9°C
☀️ Feels accurate
Rain Chance
28%
Avg 1.5mm if it rains
Cloud Cover
46%
Overcast
Pressure
1015.6 hPa
Medium volatility
Rome Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 97% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 27 min to burn
Type III-IV
🟡 41 min to burn
Type V-VI
🟢 68 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
20.1°C
Humid/Sticky
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Morning hours (before 11 AM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Italy
Flight Traffic
High
97/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~529
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Rome
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:57
☀️ Noon
12:04
🌇 Sunset
18:11
⏱️ Daylight
12h 14m
Wind Speed
12.8 km/h
Gentle breeze
Sunshine
9.8 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Rome
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Rome
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Rome on September 21 averages 25.1°C with a 28% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Rome Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 27
24°C • 18% rain
Score
99
September 28
24°C • 17% rain
Score
99
September 14
26.7°C • 23% rain
Score
98
💡 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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🌍 Explore the same date in different destinations around the world
📍 Is Rome Worth Visiting on September 21?
Planning a trip to Rome on September 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 25.1°C with a 28% historical precipitation risk.
✈️ Travel Logistics: Approximately 529 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 7 vaccinations are recommended for Italy, including COVID-19.
📊 Historical Extremes: The hottest September 21 recorded in the last 30 years saw temperatures hit 30.1°C in 2025, while the coldest dropped to 9.1°C in 2017.