Brunei Darussalam will be transitioning from inter-monsoon phase to Southwest Monsoon which is expected to start by June 2024. Typically, Southwest Monsoon will persist until September. During Southwest Monsoon, atmospheric conditions over our country tend to be quite stable with minimal thunderstorms occurrences compared to the inter-monsoon period. The wind condition generally will be blowing from the Southwest direction during this period.

Southwest Monsoon is also synonym with the season of active development of tropical storm and typhoon systems over the Northwest Pacific Ocean and the South China Sea. If this happens, our country’s weather could be influenced by the presence of these tropical storm or typhoon systems. However, it depends on the intensity and distance of their locations from our country.

The influence of tropical storm or typhoon systems nearby our region may bring about the development of squall line phenomena which will cause the country to experience unsettled weather conditions with thunderstorms and occasional gusty winds. A squall line is fast-moving cells of thunderstorms in a long, narrow line formation. Meanwhile in August, dry weather conditions in the Southeast Asian region may cause the country to experience hazy conditions caused by transboundary haze from neighboring countries as well as from local burning activities.

According to our climatological data, the normal rainfall amount recorded at our Meteorological Observation Station at Brunei International Airport for the month of June, July, August and September are 237.7 mm, 241.8 mm, 231.5 mm dan 235.1 mm respectively. However, with reference to several international climate models, rainfall amount for our country for the month of June is expected to be slightly above the normal value of 260 mm which is between 290 mm to 330 mm, whereas for July and August will be above normal range which is above 340 mm for July and above 320 mm for August. While the normal amount of rain days in June, July and August is 17 days respectively and for September is 18 days.

We shall continue to monitor the weather conditions and will issue weather advisories or warnings if necessary. Latest weather information, advisories and warnings can be accessed easily through our mobile app, Brunei WX, as these weather information, advisories and warnings can be received immediately after they are issued. Latest weather information can also be obtained by contacting the duty meteorological forecaster at our Forecast Centre, through our Weather Line 114, by visiting our website at www.met.gov.bn or follow our Facebook (@bruneiweather), Instagram (@brunei.weather) and our Telegram Channel (Brunei Weather).

Wallahu a’lam Bissawab.