Weather in Valletta in September

How September compares

September is the 3rd warmest month of the year in Valletta and ranks 79th of 134 destinations we compare for September - see where else is hot in September. Within Malta it is 3rd of 4 (Malta in September). Against London's average high of 18.6°C in September, Valletta is 7.3°C warmer by day and 11.7°C warmer at night.

Daytime and night-time in September

The typical September day in Valletta peaks at 25.9°C, but that is an average: the warmest 10% of days reach 28.0°C or more. About 72% of days top 25°C and 1 in 91 pass 30°C. Nights average 22.9°C; one night in ten drops to 20.8°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 32.0°C (2018-09-07) and the coldest night 18.9°C (2008-09-29).

Rain in September

Some rain (4-8 rainy days): about 4 days with 1 mm or more, 34 mm in total. Year to year it varies a lot - the wettest September was 2003 with 117 mm, the driest 2001 with 0 mm. Humidity averages 73%.

Sea temperature in September

The sea averages 25.8°C - warm enough to swim (22°c+). Depending on the year it ranges from 24.9°C to 26.7°C. For the warmest sea here, come in August (26.7°C).

Sunshine and daylight

Around 8.9 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 06:45 and sets about 19:10 local time in mid-September. Average cloud cover is 27%.

Is September a good time to visit Valletta?

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

Warm days without frequent extreme heat

Valletta still feels hot in September, with 72% of days reaching 25°C. That suits travellers who want warmth for spending time outdoors, though walking around at midday may feel tiring, particularly with humidity averaging 73%. Plan more active outings for the cooler parts of the day and keep the middle of the day flexible. Nights average 22.9°C, so there is not much of a cooling-off period after sunset; a room with air conditioning is worth prioritising if you struggle to sleep in warmth. Lightweight, breathable clothes should do most of the work. A light layer can be useful, but this is not a month to pack mainly for chilly evenings.

Good swimming weather, with room for rain

The sea is a strong reason to choose September: its average temperature of 25.8°C makes swimming a realistic part of the holiday rather than a bracing extra. Sunshine averages about 8.9 hours a day, giving you plenty of scope to combine time in the water with other outdoor plans. Rain is the qualification, with about 4 rainy days across the month. That is enough to justify a compact umbrella and some flexibility, but not a reason to rule September out if warmth and swimming are your priorities. Keep sun protection handy too: a month with some rain can still leave you spending long stretches outside in strong warmth.