Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 27.2 °C | 28.6 °C | 23 days | Unfavourable season |
| February | 27.7 °C | 29.1 °C | 17 days | Unfavourable season |
| March | 28.2 °C | 29.7 °C | 17 days | Possible, with trade-offs |
| April | 28.4 °C | 30.4 °C | 22 days | Unfavourable season |
| May | 27.9 °C | 29.7 °C | 23 days | Unfavourable season |
| June | 26.8 °C | 27.9 °C | 21 days | Unfavourable season |
| July | 25.6 °C | 26.4 °C | 20 days | Unfavourable season |
| August | 25.6 °C | 26.3 °C | 19 days | Unfavourable season |
| September | 26.2 °C | 27.2 °C | 21 days | Unfavourable season |
| October | 27.1 °C | 28.2 °C | 20 days | Unfavourable season |
| November | 27.4 °C | 28.9 °C | 20 days | Unfavourable season |
| December | 27.2 °C | 28.7 °C | 24 days | Unfavourable season |
Nearby in September
Before you go
Three things to check once you have picked your dates.
Entry
No visa, but an electronic travel authorisation (Travel Authorisation) must be obtained online before departure for stays of up to 90 days. Passport valid until your return date. Apply and pay for the travel authorisation online up to 30 days before arrival; the 3-month visitor's permit issued on arrival is free.
For a British passport, per the UK Foreign Office on 21 January 2026. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 21 January 2026
Health
Vaccines · typhoid recommended for most travellers; hepatitis A and hepatitis B if you are not already vaccinated. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. Certificate required only if you arrive from a country with yellow fever risk.
Malaria · None.
Mosquitoes · dengue and Zika reported: protect yourself from bites.
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 Cascade in September?
The sea averages 27.2°C in September — yes, pleasant swimming.
How hot is Cascade in September?
Expect 26.2°C in the afternoon and 24.8°C at night, averaged over the last 10 years.
Does it rain a lot in Cascade in September?
Around 21 days with rain (≥ 1 mm) in the month — 69% of days.