Brunei lies about five degrees north of the equator. Temperatures barely move through the year — typically 24°C at night and 31–32°C by day — and humidity is high. There is no true dry season, but some months are noticeably wetter than others, and the religious calendar affects a visit more than the weather does.
The short answer
February to April is generally the driest and most comfortable period, and the best for Ulu Temburong. June to August is also reasonable and coincides with the Sultan’s birthday celebrations in July. The wettest stretch usually runs from October to January, when heavy afternoon and evening downpours are frequent — though mornings are often fine and nothing closes.
Month by month
| Months | Weather | Good for | Watch out for |
|---|---|---|---|
| Jan | Wet, with heavy showers; slightly cooler | Museums, mosques, markets | Flooded paths, cancelled boat trips after storms |
| Feb – Apr | Driest and sunniest months | Everything; Ulu Temburong; river safaris | Strong sun; National Day crowds on 23 February |
| May – Jun | Hot; showers returning | City sightseeing, beaches | Humidity; school holidays in June |
| Jul – Sep | Mixed; sunny spells and thunderstorms | Sultan’s birthday events in July, day trips | Occasional haze from regional fires |
| Oct – Dec | Wettest months; frequent downpours | Lower hotel rates, indoor sights | High rivers in Temburong; December school holidays |
Ramadan and Hari Raya
The dates of the fasting month move about eleven days earlier every year, so check the calendar for the year you travel. During Ramadan, nobody may eat, drink or smoke in public between dawn and sunset; restaurants sell takeaway only by day, opening hours are shortened and the pace slows. In return, evenings are festive: Ramadan bazaars sell an extraordinary range of food for breaking the fast, and the mosques are full and illuminated.
Hari Raya Aidilfitri, the festival that ends the fast, is the high point of the Bruneian year. Families hold open houses, and for three days the Sultan opens Istana Nurul Iman to all comers — the only time the public can enter the palace. Many shops and restaurants close for the first days of the holiday, and flights and hotels fill up.
Other dates worth knowing
- National Day, 23 February: a large parade and mass performances in the capital.
- The Sultan’s birthday, 15 July: celebrations, illuminations and royal “meet the people” gatherings continue for weeks across all four districts.
- Chinese New Year (January or February): lion dances and family gatherings among the Chinese community.
- Royal Brunei Armed Forces Day, 31 May, and the Islamic New Year, the Prophet’s birthday and Hari Raya Aidiladha, all public holidays.
- School holidays in June and December, when Bruneians travel and Jerudong Park and the beaches are busiest.
Time of day matters more than time of year
Whatever the month, plan around the heat. Sightsee from early morning until about 11 am, retreat to a museum, a mall or your hotel in the middle of the day, and go out again from 4 pm for the waterfront, a river safari or the night market. Rain most often arrives in the late afternoon or at night and usually passes within an hour or two.
Days of the week
Build your plan around Thursday and Friday. The two great mosques are generally closed to non-Muslim visitors on Thursdays and for most or all of Friday, and every business shuts between about noon and 2 pm on Friday. Use those days for Temburong, a river safari or the coast, and visit the mosques from Saturday to Wednesday.
