Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 12.8 °C | 15.5 °C | 12 days | Possible, with trade-offs |
| February | 14.1 °C | 14.6 °C | 9 days | Possible, with trade-offs |
| March | 15.6 °C | 14.4 °C | 10 days | Possible, with trade-offs |
| April | 18.4 °C | 15.7 °C | 9 days | Possible, with trade-offs |
| May | 22.1 °C | 18.4 °C | 10 days | Pleasant — a good time to go |
| June | 27.5 °C | 22.7 °C | 5 days | Ideal — one of the best times of year |
| July | 30.8 °C | 25.9 °C | 3 days | Ideal — one of the best times of year |
| August | 30.6 °C | 26.6 °C | 5 days | Ideal — one of the best times of year |
| September | 26.3 °C | 25 °C | 10 days | Ideal — one of the best times of year |
| October | 22 °C | 22.2 °C | 13 days | Pleasant — a good time to go |
| November | 17.6 °C | 19.7 °C | 15 days | Possible, with trade-offs |
| December | 14.3 °C | 17.1 °C | 10 days | Possible, with trade-offs |
Nearby in September
Before you go
Three things to check once you have picked your dates.
Entry
No visa needed for stays of up to 90 days. Passport valid for at least 3 months. Passport must be issued less than 10 years before arrival; proof of accommodation, insurance, return ticket and funds may be requested.
For a British passport, per the UK Foreign Office on 7 September 2026. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 7 September 2026
Health
Vaccines · hepatitis B if you are not already vaccinated; hepatitis A and tick-borne encephalitis depending on activities and areas visited. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. No entry requirement.
Malaria · None.
Per the CDC (page reviewed 25 August 2026); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in Nettuno in September?
The sea averages 25°C in September — yes, pleasant swimming.
How hot is Nettuno in September?
Expect 26.3°C in the afternoon and 18.3°C at night, averaged over the last 10 years.
Does it rain a lot in Nettuno in September?
Around 10 days with rain (≥ 1 mm) in the month — 33% of days.