Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 27.2 °C | 27.3 °C | 18 days | Possible, with trade-offs |
| February | 27.5 °C | 27.1 °C | 14 days | Possible, with trade-offs |
| March | 27.9 °C | 27.1 °C | 16 days | Possible, with trade-offs |
| April | 28.8 °C | 27.5 °C | 14 days | Possible, with trade-offs |
| May | 29.4 °C | 27.9 °C | 15 days | Possible, with trade-offs |
| June | 29.3 °C | 28.2 °C | 21 days | Unfavourable season |
| July | 29 °C | 28.5 °C | 25 days | Unfavourable season |
| August | 29.5 °C | 29 °C | 23 days | Unfavourable season |
| September | 30.2 °C | 29.6 °C | 20 days | Unfavourable season |
| October | 29.5 °C | 29.3 °C | 21 days | Unfavourable season |
| November | 28.6 °C | 28.8 °C | 20 days | Unfavourable season |
| December | 27.9 °C | 28 °C | 18 days | Possible, with trade-offs |
Nearby in August
Before you go
Three things to check once you have picked your dates.
Entry
No visa needed for stays of up to 42 days. Passport valid until your return date. Maximum stay of 6 weeks on entry; fill in the online immigration form no more than 3 days before arrival; get your passport stamped.
For a British passport, per the UK Foreign Office on 10 December 2025. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 10 December 2025
Health
Vaccines · 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 Castries in August?
The sea averages 29°C in August — yes, pleasant swimming.
How hot is Castries in August?
Expect 29.5°C in the afternoon and 25.6°C at night, averaged over the last 10 years.
Does it rain a lot in Castries in August?
Around 23 days with rain (≥ 1 mm) in the month — 73% of days.