Naples weather in September
In September, Naples sees average daytime highs of 86°F and overnight lows near 77°F, with 5.9 in of rain across 19.6 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.
Day-to-day highs hold fairly steady near 86°F through the month. The sky is clear or mostly clear about 25% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Naples's 10th-clearest and 9th-windiest month. For the whole year in context, see Naples's year-round climate.
- Daytime high
- 86°
- 3rd warmest
- Overnight low
- 77°
- 10th coldest
- Rainfall
- 5.9 in
- 19.6 wet days
- Daylight
- 12 h 12 min
- 6:17 AM – 6:26 PM
- Cloud cover
- 66%
- 10th clearest
- Wind
- 7 mph
- 9th windiest
- Solar energy
- 5.08 kWh/m²
- Travel score
- 3.8
- out of 10
Naples is city in Collier County, Florida, United States.
- Density
- 506/km²
- people per km²
- Founded
- 1886
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 86°F through the month.
A typical September day in Naples reaches about 86°F in the afternoon and slips back to 77°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 83°F and 89°F. Set against its neighbours, September runs on par with August and about 3°F warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 85 | 85 | 85 | 85 | 85 | 85 |
| Avg low (°F) | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 76 | 76 | 76 | 76 | 76 | 76 | 76 | 76 | 76 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 87 | 78 |
| 2 | 87 | 78 |
| 3 | 87 | 78 |
| 4 | 87 | 78 |
| 5 | 87 | 78 |
| 6 | 87 | 78 |
| 7 | 87 | 78 |
| 8 | 87 | 77 |
| 9 | 87 | 77 |
| 10 | 86 | 77 |
| 11 | 86 | 77 |
| 12 | 86 | 77 |
| 13 | 86 | 77 |
| 14 | 86 | 77 |
| 15 | 86 | 77 |
| 16 | 86 | 77 |
| 17 | 86 | 77 |
| 18 | 86 | 77 |
| 19 | 86 | 77 |
| 20 | 86 | 77 |
| 21 | 86 | 77 |
| 22 | 86 | 76 |
| 23 | 86 | 76 |
| 24 | 86 | 76 |
| 25 | 85 | 76 |
| 26 | 85 | 76 |
| 27 | 85 | 76 |
| 28 | 85 | 76 |
| 29 | 85 | 76 |
| 30 | 85 | 76 |
How September really feels in Naples
Once humidity and wind are folded in, September averages 30 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Naples weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 72° / 59° | 1.7 | 4.9 | 10.5 | 7.7 |
| Feb | 73° / 61° | 1.3 | 4.4 | 11.1 | 8.0 |
| Mar | 76° / 64° | 1.5 | 4.6 | 11.8 | 8.1 |
| Apr | 81° / 68° | 1.8 | 6 | 12.6 | 7.4 |
| May | 84° / 73° | 2.7 | 9.2 | 13.3 | 5.7 |
| Jun | 86° / 77° | 6.2 | 19.1 | 13.6 | 3.9 |
| Jul | 87° / 78° | 5.4 | 21.6 | 13.5 | 3.4 |
| Aug | 87° / 78° | 5.8 | 21.5 | 12.9 | 3.4 |
| Sep | 86° / 77° | 5.9 | 19.6 | 12.2 | 3.8 |
| Oct | 83° / 73° | 3.1 | 9.2 | 11.4 | 6.0 |
| Nov | 78° / 66° | 1.3 | 3.9 | 10.7 | 7.9 |
| Dec | 74° / 62° | 1.2 | 4.2 | 10.4 | 8.0 |
Cloud cover in September
The sky is clear or mostly clear about 25% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 32 | 34 | 34 | 34 | 35 | 37 | 37 | 38 | 39 | 40 | 42 | 42 | 43 | 44 | 45 | 45 | 44 | 45 | 45 | 45 | 45 | 45 | 44 | 44 | 44 | 44 | 45 | 44 | 45 | 45 |
| Cloudier (%) | 68 | 66 | 66 | 66 | 65 | 63 | 63 | 62 | 61 | 60 | 58 | 58 | 57 | 56 | 55 | 55 | 56 | 55 | 55 | 55 | 55 | 55 | 56 | 56 | 56 | 56 | 55 | 56 | 55 | 55 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 32 | 68 |
| 2 | 34 | 66 |
| 3 | 34 | 66 |
| 4 | 34 | 66 |
| 5 | 35 | 65 |
| 6 | 37 | 63 |
| 7 | 37 | 63 |
| 8 | 38 | 62 |
| 9 | 39 | 61 |
| 10 | 40 | 60 |
| 11 | 42 | 58 |
| 12 | 42 | 58 |
| 13 | 43 | 57 |
| 14 | 44 | 56 |
| 15 | 45 | 55 |
| 16 | 45 | 55 |
| 17 | 44 | 56 |
| 18 | 45 | 55 |
| 19 | 45 | 55 |
| 20 | 45 | 55 |
| 21 | 45 | 55 |
| 22 | 45 | 55 |
| 23 | 44 | 56 |
| 24 | 44 | 56 |
| 25 | 44 | 56 |
| 26 | 44 | 56 |
| 27 | 45 | 55 |
| 28 | 44 | 56 |
| 29 | 45 | 55 |
| 30 | 45 | 55 |
Chance of precipitation in September
Naples gets around 5.9 in of rain over 19.6 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 64% and peaks near 71% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 70 | 69 | 69 | 68 | 67 | 67 | 66 | 65 | 64 | 64 | 63 | 63 | 62 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 52 |
| Rain chance (%) | |
|---|---|
| 1 | 71 |
| 2 | 71 |
| 3 | 71 |
| 4 | 71 |
| 5 | 70 |
| 6 | 70 |
| 7 | 70 |
| 8 | 70 |
| 9 | 69 |
| 10 | 69 |
| 11 | 68 |
| 12 | 67 |
| 13 | 67 |
| 14 | 66 |
| 15 | 65 |
| 16 | 64 |
| 17 | 64 |
| 18 | 63 |
| 19 | 63 |
| 20 | 62 |
| 21 | 62 |
| 22 | 61 |
| 23 | 60 |
| 24 | 59 |
| 25 | 58 |
| 26 | 57 |
| 27 | 56 |
| 28 | 55 |
| 29 | 54 |
| 30 | 52 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 66% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 4 |
| Muggy (%) | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 12 | 12 |
| Oppressive (%) | 62 | 63 | 63 | 64 | 65 | 65 | 66 | 66 | 66 | 67 | 68 | 67 | 68 | 67 | 68 | 67 | 67 | 67 | 67 | 67 | 66 | 67 | 67 | 68 | 67 | 68 | 67 | 66 | 66 | 66 |
| Miserable (%) | 37 | 36 | 35 | 34 | 33 | 33 | 32 | 31 | 31 | 30 | 29 | 29 | 28 | 28 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 19 | 18 | 17 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 62 | 37 |
| 2 | 0 | 0 | 1 | 63 | 36 |
| 3 | 0 | 0 | 2 | 63 | 35 |
| 4 | 0 | 0 | 2 | 64 | 34 |
| 5 | 0 | 0 | 2 | 65 | 33 |
| 6 | 0 | 0 | 2 | 65 | 33 |
| 7 | 0 | 0 | 2 | 66 | 32 |
| 8 | 0 | 0 | 3 | 66 | 31 |
| 9 | 0 | 0 | 3 | 66 | 31 |
| 10 | 0 | 0 | 3 | 67 | 30 |
| 11 | 0 | 0 | 3 | 68 | 29 |
| 12 | 0 | 0 | 4 | 67 | 29 |
| 13 | 0 | 0 | 4 | 68 | 28 |
| 14 | 0 | 0 | 5 | 67 | 28 |
| 15 | 0 | 0 | 5 | 68 | 27 |
| 16 | 0 | 0 | 6 | 67 | 27 |
| 17 | 0 | 0 | 6 | 67 | 27 |
| 18 | 0 | 0 | 7 | 67 | 26 |
| 19 | 0 | 0 | 7 | 67 | 26 |
| 20 | 0 | 0 | 8 | 67 | 25 |
| 21 | 0 | 1 | 8 | 66 | 25 |
| 22 | 0 | 1 | 8 | 67 | 24 |
| 23 | 0 | 1 | 9 | 67 | 23 |
| 24 | 0 | 1 | 9 | 68 | 22 |
| 25 | 0 | 2 | 10 | 67 | 21 |
| 26 | 0 | 2 | 10 | 68 | 20 |
| 27 | 1 | 2 | 11 | 67 | 19 |
| 28 | 1 | 3 | 11 | 66 | 19 |
| 29 | 1 | 3 | 12 | 66 | 18 |
| 30 | 1 | 4 | 12 | 66 | 17 |
Wind in September
Winds average 7 mph in September.
Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | light breeze |
| 27 | 8 | light breeze |
| 28 | 8 | light breeze |
| 29 | 8 | light breeze |
| 30 | 8 | light breeze |
Sunrise & sunset in September
Daylight runs from about 12 h 30 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 42 minutes over September. Sunrise moves from 6:11 AM to 6:23 AM, and sunset from 6:43 PM to 6:10 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.5 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.8 |
| Sunrise (AM) | 6:11 | 6:11 | 6:12 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:14 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:19 | 6:19 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 | 6:23 | 6:23 |
| Sunset (PM) | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 | 6:38 | 6:36 | 6:35 | 6:34 | 6:33 | 6:32 | 6:31 | 6:30 | 6:28 | 6:27 | 6:26 | 6:25 | 6:24 | 6:23 | 6:21 | 6:20 | 6:19 | 6:18 | 6:17 | 6:16 | 6:14 | 6:13 | 6:12 | 6:11 | 6:10 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.5 | 6:11 | 6:43 |
| 2 | 12.5 | 6:11 | 6:42 |
| 3 | 12.5 | 6:12 | 6:41 |
| 4 | 12.5 | 6:12 | 6:40 |
| 5 | 12.4 | 6:12 | 6:39 |
| 6 | 12.4 | 6:13 | 6:38 |
| 7 | 12.4 | 6:13 | 6:36 |
| 8 | 12.4 | 6:14 | 6:35 |
| 9 | 12.3 | 6:14 | 6:34 |
| 10 | 12.3 | 6:14 | 6:33 |
| 11 | 12.3 | 6:15 | 6:32 |
| 12 | 12.3 | 6:15 | 6:31 |
| 13 | 12.2 | 6:16 | 6:30 |
| 14 | 12.2 | 6:16 | 6:28 |
| 15 | 12.2 | 6:17 | 6:27 |
| 16 | 12.2 | 6:17 | 6:26 |
| 17 | 12.1 | 6:17 | 6:25 |
| 18 | 12.1 | 6:18 | 6:24 |
| 19 | 12.1 | 6:18 | 6:23 |
| 20 | 12.0 | 6:19 | 6:21 |
| 21 | 12.0 | 6:19 | 6:20 |
| 22 | 12.0 | 6:19 | 6:19 |
| 23 | 12.0 | 6:20 | 6:18 |
| 24 | 11.9 | 6:20 | 6:17 |
| 25 | 11.9 | 6:21 | 6:16 |
| 26 | 11.9 | 6:21 | 6:14 |
| 27 | 11.9 | 6:22 | 6:13 |
| 28 | 11.8 | 6:22 | 6:12 |
| 29 | 11.8 | 6:23 | 6:11 |
| 30 | 11.8 | 6:23 | 6:10 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.08 kWh/m².
For context, solar energy here swings from a low near 3.46 kWh/m² to a high of 6.63 kWh/m² in May across the year — September's 5.08 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.1 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.4 | Bright |
| 2 | 5.4 | Bright |
| 3 | 5.4 | Bright |
| 4 | 5.3 | Bright |
| 5 | 5.3 | Bright |
| 6 | 5.3 | Bright |
| 7 | 5.3 | Bright |
| 8 | 5.3 | Bright |
| 9 | 5.2 | Bright |
| 10 | 5.2 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.1 | Bright |
| 14 | 5.1 | Bright |
| 15 | 5.1 | Bright |
| 16 | 5.1 | Bright |
| 17 | 5.0 | Bright |
| 18 | 5.0 | Bright |
| 19 | 5.0 | Bright |
| 20 | 5.0 | Bright |
| 21 | 5.0 | Bright |
| 22 | 4.9 | Bright |
| 23 | 4.9 | Bright |
| 24 | 4.9 | Bright |
| 25 | 4.9 | Bright |
| 26 | 4.8 | Bright |
| 27 | 4.8 | Bright |
| 28 | 4.8 | Bright |
| 29 | 4.8 | Bright |
| 30 | 4.8 | Bright |
Hazard calendar for Naples
In September, Naples sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.
Naples sits in the Atlantic hurricane belt; the season peaks August–October.
Naples's rainy season runs June–October, when most of the year's rain falls.
Is September a good time to visit Naples?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Naples.
What to pack for Naples in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Naples sees daytime highs around 86°F and nights near 77°F. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.
Sea temperature near Naples in September
The nearest coast averages about 85°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 86°F and coldest in January near 68°F.
The water stays above 68°F all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 68 | 68 | 71 | 76 | 80 | 84 | 86 | 86 | 85 | 82 | 76 | 71 |
| Comfort | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 68 | Refreshing |
| Feb | 68 | Refreshing |
| Mar | 71 | Refreshing |
| Apr | 76 | Warm |
| May | 80 | Warm |
| Jun | 84 | Tropical |
| Jul | 86 | Tropical |
| Aug | 86 | Tropical |
| Sep | 85 | Tropical |
| Oct | 82 | Warm |
| Nov | 76 | Warm |
| Dec | 71 | Refreshing |
UV index in Naples in September
Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Naples peaks around July 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 5 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 5 | 7 | 9 | 10 | 10 | 11 | 12 | 11 | 10 | 8 | 6 | 5 |
| Level | High | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | High |
| Feb | 7 | Very high |
| Mar | 9 | Very high |
| Apr | 10 | Very high |
| May | 10 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 5 | Moderate |
Air quality in Naples in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Naples is worst in July — around 20 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (December, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 9 | 12 | 10 | 11 | 15 | 20 | 17 | 12 | 9 | 8 | 7 |
| Level | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 9 | Good |
| Mar | 12 | Good |
| Apr | 10 | Good |
| May | 11 | Good |
| Jun | 15 | Moderate |
| Jul | 20 | Moderate |
| Aug | 17 | Moderate |
| Sep | 12 | Moderate |
| Oct | 9 | Good |
| Nov | 8 | Good |
| Dec | 7 | Good |
Where is Naples?
Naples sits at 26.1°N, 81.8°W, 3 ft above sea level, in United States. The nearest listed city is East Naples, 1.9 mi away.
Topography around Naples
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Naples.
Within 2 miles, the terrain around Naples has only modest variations in elevation — a maximum elevation change of 46 ft around an average of 10 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 102 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 138 ft.
The land around Naples is covered by artificial surfaces (39%) and water (35%) within 2 miles, water (52%) and trees (20%) within 10 miles, and water (43%) and trees (24%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Naples (26.1423°, -81.796°, elevation 3 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).