September is one of the warmer months of the year in Naples, with average highs near 29.6°C and lows around 26.7°C (mean 28.2°C). It is a relatively wet time of year, averaging 206 mm of rainfall and 79% relative humidity across the period.
September is one of the warmer months of the year in Naples. Across 45 years of records, the warmest September in Naples was 2024 — when the month averaged 29.6°C — while the coldest was 1984 at 26.8°C. Typical September days reach 29.6°C with nights near 26.7°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Naples, averaging 206 mm of rainfall. The wettest September on record was 2001 with 370 mm, while the driest was 2019 at 62 mm.
Relative humidity in Naples during September averages 79%. The most humid Septembers were 1983 and 2005 at 82%, and the least humid was 2021 at 75%.
September receives about 5 kWh/m²/day of solar energy in Naples. The sunniest September was 2019 at 5.7 kWh/m²/day, and the cloudiest was 1998 at 4.4.
Average wind speed in Naples during September is 3.2 m/s. The windiest September was 2004 at 5.1 m/s, while the calmest was 1987 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.6°C | 28.1°C | 28.1°C | 28.3°C | 28.9°C | +1.3°C |
| Avg High | 29.1°C | 29.4°C | 29.5°C | 29.8°C | 30.3°C | +1.2°C |
| Avg Low | 26.2°C | 26.7°C | 26.7°C | 26.9°C | 27.4°C | +1.2°C |
| Avg Rain | 179 mm | 187 mm | 240 mm | 209 mm | 214 mm | +34 mm |
September temperatures in Naples have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 21.9°C (1983) to a record high of 32.5°C (2022).
Rainfall in September is a relatively wet time of year, averaging 206 mm, with a wettest year of 370 mm.
A quieter season to visit Naples
If your dates are flexible, the more temperate months of March and November tend to be the most comfortable for visiting Naples. That said, September — with days averaging 29.6°C and nights around 26.7°C (mean 28.2°C) and higher rainfall (206 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.9°C | 28.5°C | 27.1°C | 31.0°C | 25.6°C | 149 mm | 80% | 2.7 m/s | 4.8 |
| 2024 🔥 | 30.9°C | 29.6°C | 28.3°C | 31.6°C | 27.3°C | 195 mm | 80% | 3 m/s | 5 |
| 2023 | 30.8°C | 29.3°C | 27.7°C | 32.4°C | 25.7°C | 196 mm | 76% | 2.5 m/s | 5.2 |
| 2022 | 30.2°C | 28.7°C | 27.2°C | 32.5°C | 22.1°C | 350 mm | 78% | 2.9 m/s | 5 |
| 2021 | 30.0°C | 28.5°C | 27.1°C | 31.1°C | 25.0°C | 152 mm | 75% | 2.3 m/s | 5 |
| 2020 | 29.9°C | 28.5°C | 27.2°C | 32.4°C | 24.9°C | 242 mm | 81% | 3.2 m/s | 4.9 |
| 2019 | 30.4°C | 28.5°C | 26.7°C | 32.2°C | 24.2°C | 62 mm | 78% | 4.3 m/s | 5.7 |
| 2018 | 29.9°C | 28.5°C | 27.1°C | 31.3°C | 25.8°C | 160 mm | 79% | 2.8 m/s | 5.6 |
| 2017 | 29.8°C | 28.3°C | 26.9°C | 31.3°C | 25.4°C | 312 mm | 79% | 3.1 m/s | 5.1 |
| 2016 | 29.9°C | 28.6°C | 27.4°C | 30.9°C | 26.2°C | 197 mm | 78% | 2.4 m/s | 5 |
| 2015 | 29.7°C | 28.5°C | 27.4°C | 31.1°C | 25.9°C | 226 mm | 79% | 2.3 m/s | 4.5 |
| 2014 | 29.4°C | 28.1°C | 26.7°C | 31.4°C | 25.2°C | 266 mm | 79% | 2.5 m/s | 4.6 |
| 2013 | 29.4°C | 27.9°C | 26.5°C | 30.8°C | 25.0°C | 251 mm | 80% | 2.9 m/s | 4.8 |
| 2012 | 29.1°C | 27.6°C | 26.1°C | 30.9°C | 24.2°C | 213 mm | 79% | 3 m/s | 5.1 |
| 2011 | 30.2°C | 28.7°C | 27.2°C | 31.4°C | 26.1°C | 196 mm | 76% | 2.7 m/s | 5.2 |
| 2010 | 30.1°C | 28.5°C | 26.9°C | 31.7°C | 25.0°C | 203 mm | 79% | 3.5 m/s | 5.4 |
| 2009 | 29.9°C | 28.6°C | 27.3°C | 31.2°C | 25.3°C | 222 mm | 77% | 2.3 m/s | 5 |
| 2008 | 29.5°C | 27.9°C | 26.3°C | 31.3°C | 24.0°C | 185 mm | 80% | 3.9 m/s | 5.1 |
| 2007 | 30.0°C | 28.4°C | 26.8°C | 31.9°C | 25.2°C | 237 mm | 78% | 3.1 m/s | 5.2 |
| 2006 | 29.7°C | 28.3°C | 26.9°C | 30.8°C | 24.1°C | 218 mm | 76% | 2.6 m/s | 5.3 |
| 2005 | 29.4°C | 27.9°C | 26.3°C | 30.9°C | 25.0°C | 152 mm | 82% | 3.5 m/s | 5.2 |
| 2004 | 29.5°C | 28.1°C | 26.7°C | 31.1°C | 24.3°C | 213 mm | 82% | 5.1 m/s | 4.6 |
| 2003 | 29.5°C | 28.1°C | 26.7°C | 30.6°C | 25.0°C | 323 mm | 81% | 3.1 m/s | 4.9 |
| 2002 | 29.6°C | 28.3°C | 27.0°C | 31.0°C | 26.0°C | 201 mm | 82% | 3.6 m/s | 5 |
| 2001 🌧️ | 28.5°C | 27.2°C | 25.9°C | 30.3°C | 22.3°C | 370 mm | 80% | 3 m/s | 4.5 |
| 2000 | 29.8°C | 28.4°C | 27.1°C | 31.5°C | 24.9°C | 280 mm | 78% | 2.8 m/s | 5 |
| 1999 | 29.5°C | 28.1°C | 26.7°C | 31.5°C | 23.4°C | 266 mm | 79% | 3.8 m/s | 4.8 |
| 1998 | 29.6°C | 28.5°C | 27.3°C | 30.9°C | 26.0°C | 269 mm | 81% | 4.4 m/s | 4.4 |
| 1997 | 29.4°C | 27.9°C | 26.5°C | 31.0°C | 24.3°C | 154 mm | 77% | 3.3 m/s | 4.9 |
| 1996 | 29.9°C | 28.4°C | 26.9°C | 31.2°C | 25.3°C | 92 mm | 75% | 3.2 m/s | 5.3 |
| 1995 | 29.7°C | 28.3°C | 26.9°C | 30.8°C | 25.9°C | 182 mm | 79% | 2.9 m/s | 4.9 |
| 1994 | 28.7°C | 27.6°C | 26.5°C | 30.7°C | 24.8°C | 268 mm | 81% | 3.2 m/s | 4.5 |
| 1993 | 29.3°C | 28.0°C | 26.6°C | 30.6°C | 23.0°C | 193 mm | 80% | 3.3 m/s | 5.1 |
| 1992 | 29.0°C | 27.7°C | 26.4°C | 30.1°C | 24.9°C | 141 mm | 80% | 3.1 m/s | 4.8 |
| 1991 | 29.2°C | 27.9°C | 26.5°C | 30.5°C | 23.4°C | 155 mm | 79% | 2.8 m/s | 5.2 |
| 1990 | 29.5°C | 28.2°C | 26.9°C | 30.7°C | 24.3°C | 155 mm | 76% | 2.9 m/s | 5.3 |
| 1989 | 29.7°C | 28.3°C | 26.8°C | 30.8°C | 25.4°C | 176 mm | 78% | 3.2 m/s | 5.5 |
| 1988 | 29.7°C | 28.2°C | 26.7°C | 30.5°C | 24.8°C | 143 mm | 78% | 4.3 m/s | 5.1 |
| 1987 | 29.5°C | 28.1°C | 26.8°C | 30.9°C | 25.3°C | 168 mm | 76% | 2.1 m/s | 4.7 |
| 1986 | 29.5°C | 28.0°C | 26.5°C | 30.4°C | 25.4°C | 128 mm | 78% | 3.3 m/s | 5.4 |
| 1985 | 28.5°C | 27.0°C | 25.5°C | 29.9°C | 24.3°C | 164 mm | 81% | 4.2 m/s | 5.3 |
| 1984 ❄️ | 28.3°C | 26.8°C | 25.3°C | 29.9°C | 23.8°C | 222 mm | 80% | 4 m/s | 4.8 |
| 1983 | 28.5°C | 27.2°C | 25.8°C | 29.2°C | 21.9°C | 230 mm | 82% | 3.5 m/s | — |
| 1982 | 29.0°C | 27.6°C | 26.3°C | 30.7°C | 24.2°C | 215 mm | 77% | 3 m/s | — |
| 1981 | 29.1°C | 27.6°C | 26.0°C | 30.4°C | 22.6°C | 169 mm | 78% | 3.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.6°C with lows near 26.7°C (mean 28.2°C), based on 45 years of NASA POWER data.
September averages 206 mm of rainfall in Naples, a relatively wet time of year. The wettest on record was 370 mm in 2001.
The hottest September reached 32.5°C in 2022. The coldest dipped to 21.9°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 28.7°C to 30.4°C and overnight lows from 25.8°C to 27.5°C over the same span.
September is one of the warmer months of the year in Naples and a relatively wet time of year, so plan for around 29.6°C daytime highs and 26.7°C at night.
Not quite — September is the 10th coolest month in Naples, averaging 28.2°C.
For September in Naples, pack light layers you can adjust through the day, with typical highs of 29.6°C and lows of 26.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 3.2 m/s. The windiest September on record averaged 5.1 m/s (2004).
The wettest September on record was 2001 with 370 mm. On average, September sees 206 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Naples behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
