Italy Naples Weather in September — Climate Guide
September in Naples is high
September is high for Naples.
September is a top month in Naples — still warm at 28°C/18°C, with the sea at its warmest after a summer of heating, and crowds easing once the August peak passes. Rain ticks up a little (about 75mm), but conditions remain excellent.
The September 19 feast of San Gennaro is the city's most important — the patron saint's dried blood is watched for liquefaction at the Cathedral, drawing big crowds and a festive atmosphere. It's a great time to experience local tradition.
Travel score
Naples September Weather Stats
Avg High
28°C
Avg Low
18°C
Rainy Days
6
75mm total
Sunshine
7.5h
Daily avg
Humidity
68%
comfortable
UV Index
6
High
Wind
9 km/h
Gusts 20
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
18 μg/m³
PM10
34 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
29°C
Nighttime
19°C
Humidity and wind affect how the actual temperature feels.
Wind
9 km/h
Max gust 20 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Warm with the sea at its warmest
- Crowds ease after Ferragosto
- San Gennaro feast (Sep 19)
- Excellent for islands and Pompeii
Cons
- Still high-season prices early on
- Rain increasing (75mm)
- Popular sights still busy
- Occasional late-summer thunderstorms
September Events & Festivals
- San Gennaro blood miracle (Sep 19) — patron saint's feast
- Warm sea continues — great late-season swimming
- Crowds ease after Ferragosto
- Excellent shoulder-season conditions
Naples in September — Full Picture
September is a top month in Naples — still warm at 28°C/18°C, with the sea at its warmest after a summer of heating, and crowds easing once the August peak passes. Rain ticks up a little (about 75mm), but conditions remain excellent.
The September 19 feast of San Gennaro is the city's most important — the patron saint's dried blood is watched for liquefaction at the Cathedral, drawing big crowds and a festive atmosphere. It's a great time to experience local tradition.
The islands and coast are ideal: warm water for swimming, full ferry schedules, and a touch fewer crowds than midsummer. Capri, the Amalfi Coast, and the Blue Grotto are all in play. Pompeii and Vesuvius are more comfortable than in peak heat.
Prices stay high early in the month, then soften toward late September. Pack summer clothing with a light evening layer, swimwear, and sun protection — September offers warmth without the worst of the crowds.
What to Wear & What to Pack
Warm late summer — around 28°C/18°C. Summer clothing with a light layer for evenings. Hat, sunglasses, SPF 30+. Swimwear still useful; the sea stays warm.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
19.3°C
9.7°C
7.7/mo
Summer (Jun·Jul·Aug)
29.3°C
19.3°C
3/mo
Autumn (Sep·Oct·Nov)
Current23°C
14°C
8/mo
Winter (Dec·Jan·Feb)
13.7°C
5.7°C
9.3/mo
Naples Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 13° | 5° | 9d·105mm | 4h | 75% | 2 | Quiet | Low season | |
| 14° | 5° | 9d·95mm | 4.5h | 73% | 2 | Quiet | Low season | |
| 16° | 7° | 9d·90mm | 5h | 70% | 4 | Moderate | Shoulder | |
| April (Best) | 19° | 9° | 8d·75mm | 6.5h | 68% | 5 | Busy | Peak |
| May (Best) | 23° | 13° | 6d·50mm | 8h | 67% | 7 | Busy | Peak |
| 27° | 17° | 4d·35mm | 9h | 65% | 8 | Busy | Peak | |
| 30° | 20° | 2d·20mm | 10h | 63% | 9 | Very busy | Peak | |
| 31° | 21° | 3d·30mm | 9.5h | 64% | 9 | Very busy | Peak | |
| September (Best) | 28° | 18° | 6d·75mm | 7.5h | 68% | 6 | Busy | Peak |
| 23° | 14° | 8d·110mm | 6h | 72% | 4 | Moderate | Shoulder | |
| 18° | 10° | 10d·130mm | 4.5h | 75% | 3 | Quiet | Low season | |
| 14° | 7° | 10d·115mm | 4h | 76% | 2 | Moderate | Shoulder |
View Other Months
Naples September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Naples?
Naples in September is high. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Naples in September?
Naples September averages a high of 28°C and a low of 18°C.
Does it rain much in Naples in September?
Naples September averages 75mm of rainfall over about 6 rainy days.
What should I wear in Naples in September?
Warm late summer — around 28°C/18°C. Summer clothing with a light layer for evenings. Hat, sunglasses, SPF 30+. Swimwear still useful; the sea stays warm.
What time are sunrise and sunset in Naples in September?
Naples September sunrise is 06:30 and sunset is 19:10, with 12h 40min of daylight.
What's the air quality like in Naples in September?
Naples September air quality (AQI) averages 48, rated Good. PM2.5 averages 18μg/m³.
What activities are recommended in Naples in September?
In September, Naples is great for Capri + late-season swimming, San Gennaro feast at the Cathedral, Amalfi Coast day trip.
Is September peak season in Naples?
Naples September crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Naples
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.