Sarawak weather
Our guide to the weather in Sarawak during September
We've looked at the most up-to-date weather data for Sarawak, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Sarawak weather in September.
How hot is it in Sarawak during September?
The temperature reaches around 32℃ during the daytime in September, falling away to 24℃ at night. Of course, the high humidity will make it feel even hotter. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.
Does it rain in Sarawak during September?
On average, there will be 9 rainy days during the month, amounting to 140.8mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. Due to the high temperature and humidity, you might expect lots of thunderstorms, however they're actually fairly infrequent at this time of year. On average, September will see just 3 days that produce a storm.
Is it windy in Sarawak during September?
No - there is very light air movement in September so conditions should be calm with light breezes at times.
Weather in Sarawak
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