Weather in Galle in September

How September compares

September is the 12th warmest month of the year in Galle and ranks 53rd of 134 destinations we compare for September - see where else is hot in September. Against London's average high of 18.6°C in September, Galle is 9.2°C warmer by day and 13.6°C warmer at night.

Daytime and night-time in September

The typical September day in Galle peaks at 27.8°C, but that is an average: the warmest 10% of days reach 28.7°C or more. About 100% of days top 25°C. Nights average 24.8°C; one night in ten drops to 24.1°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 29.9°C (2019-09-27) and the coldest night 23.3°C (2019-09-26).

Rain in September

Wet (more than 8 rainy days): about 28 days with 1 mm or more, 275 mm in total. Year to year it varies a lot - the wettest September was 2019 with 399 mm, the driest 2008 with 98 mm. Humidity averages 86%.

Sea temperature in September

The sea averages 27.9°C - warm enough to swim (22°c+). Depending on the year it ranges from 27.3°C to 28.4°C. For the warmest sea here, come in April (29.5°C).

Sunshine and daylight

Around 2.0 hours of sunshine a day (estimated from cloud cover), 12.0 hours of daylight: the sun rises about 06:00 and sets about 18:09 local time in mid-September. Average cloud cover is 83%.

Is September a good time to visit Galle?

It is a reasonable choice: hot days but expect showers. The best months for Galle on our scoring are March, February, January; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Hot enough for light clothing, even in the coolest month

September is Galle's coolest month by daytime temperature, but that does not make it cool by UK standards. Average highs of 27.8°C and night lows of 24.8°C mean light clothing remains useful well into the evening. Humidity of 86% is the catch: the air can feel close even without exceptionally high temperatures. Loose, breathable clothes and accommodation with cooling are sensible choices, especially if warm nights affect your sleep. Keep strenuous outdoor plans flexible and take breaks around midday rather than treating the relatively modest high as a sign of mild conditions. This is a better fit for travellers comfortable with humid heat than those seeking fresh evenings.

Plan around wet weather, not guaranteed sunshine

With about 28 rainy days, September is not a sensible choice if your holiday depends on staying dry outdoors. That frequency does not tell you how long rain will last on any particular day, so avoid assuming either constant downpours or reliably brief showers. There are about 12 hours of daylight, but only about 2 hours of sunshine: daylight should not be mistaken for clear skies. Pack a light waterproof, protect belongings from rain and leave room to change plans. The month suits a relaxed approach where wet weather is an accepted part of the trip, rather than something likely to leave you disappointed.