Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 28.1 °C | 26.1 °C | 9 days | Ideal — one of the best times of year |
| February | 27.3 °C | 25.8 °C | 8 days | Ideal — one of the best times of year |
| March | 25.1 °C | 24 °C | 8 days | Ideal — one of the best times of year |
| April | 21.7 °C | 20.9 °C | 9 days | Pleasant — a good time to go |
| May | 17.4 °C | 17.2 °C | 7 days | Possible, with trade-offs |
| June | 15.1 °C | 14.2 °C | 7 days | Possible, with trade-offs |
| July | 14.3 °C | 12.8 °C | 8 days | Possible, with trade-offs |
| August | 16.4 °C | 13.9 °C | 7 days | Possible, with trade-offs |
| September | 18 °C | 16.1 °C | 6 days | Possible, with trade-offs |
| October | 20.5 °C | 18.9 °C | 10 days | Pleasant — a good time to go |
| November | 24.4 °C | 22 °C | 8 days | Ideal — one of the best times of year |
| December | 26.7 °C | 24.3 °C | 7 days | Ideal — one of the best times of year |
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 until your return date. Passport needs at least one blank page for the entry stamp; fresh food, dairy and animal products cannot be imported.
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. No entry requirement.
Malaria · None.
Per the CDC (page reviewed 3 September 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 Colonia del Sacramento in September?
The sea averages 16.1°C in September — too cold for most swimmers.
How hot is Colonia del Sacramento in September?
Expect 18°C in the afternoon and 10.9°C at night, averaged over the last 10 years.
Does it rain a lot in Colonia del Sacramento in September?
Around 6 days with rain (≥ 1 mm) in the month — 21% of days.