Weather in Vilamoura in September

How September compares

September is the 3rd warmest month of the year in Vilamoura. Within Portugal it is 6th of 13 (Portugal in September). Against London's average high of 18.6°C in September, Vilamoura is 7.4°C warmer by day and 7.2°C warmer at night.

Daytime and night-time in September

The typical September day in Vilamoura peaks at 26.0°C, but that is an average: the warmest 10% of days reach 29.2°C or more. About 66% of days top 25°C and 1 in 16 pass 30°C. Nights average 18.4°C; one night in ten drops to 16.0°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 34.4°C (2016-09-05) and the coldest night 12.7°C (1993-09-30).

Rain in September

Some rain (4-8 rainy days): about 4 days with 1 mm or more, 25 mm in total. Year to year it varies a lot - the wettest September was 2008 with 94 mm, the driest 2017 with 0 mm. Humidity averages 67%.

Sea temperature in September

The sea averages 20.8°C - bracing (18-22°c). Depending on the year it ranges from 19.6°C to 22.2°C. For the warmest sea here, come in August (20.9°C).

Sunshine and daylight

Around 8.3 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 07:15 and sets about 19:41 local time in mid-September. Average cloud cover is 32%.

Is September a good time to visit Vilamoura?

Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Vilamoura on our scoring are July, August, June; months averaging 25°C or more: Jun, Jul, Aug, Sep.

Warm days, with some hotter spells

Expect summer clothing to be useful during the day, but do not assume every afternoon will be hot. Around 66% of days reach 25°C, while just 6% reach 30°C. That makes September a sensible choice if you enjoy warmth but would rather not plan your whole day around avoiding high temperatures. Hotter spells are still possible, so keep shade breaks and a slower pace in mind around midday. Light, loose clothing and sun protection belong in your bag. The overall balance suits travellers who want to spend plenty of time outside, rather than those seeking reliably intense heat.

Plenty of sunshine, but a bracing sea

The distinction between warm air and cooler water matters here. Average sea temperatures of 20.8°C mean swimming can feel bracing, even when the afternoon is warm. If you prefer water that feels warm as you get in, the sea may be the compromise in an otherwise appealing month. Sunshine averages about 8.3 hours a day within 12.2 hours of daylight, giving you plenty of scope for outdoor plans without expecting uninterrupted blue skies. Keep a towel and a dry layer handy after swimming, and treat sea time as something to judge by your own tolerance rather than the air temperature.

Allow for rain and cooler evenings

Rain is a possibility rather than a reason to rule September out. With about 4 rainy days during the month, it makes sense to leave outdoor plans flexible and pack a light waterproof rather than assume every day will stay dry. Evenings deserve some thought too: the average night low is 18.4°C, but the coldest 10% of nights fall to 16°C or below. A cardigan, light jumper or jacket should therefore earn its place in your luggage. This suits travellers happy to adjust their clothing and plans, rather than those who want guaranteed dry weather and warm nights.