Brunei Darussalam will begin entering the inter-monsoon season, which is a transitional period after the Southwest Monsoon and before entering the Northeast Monsoon, in the first week of this October. The inter-monsoon period is expected to continue until the end of November 2025. Based on climatological records, thunderstorms occurrences are more frequent during the inter-monsoon period when compared to other months of the year. On average, the number of rain days for October is 21 days, while November records 22 days. Fair weather conditions in the morning, and isolated showers are possible over coastal areas around midday.

Thunderstorms occurrences especially over inland areas in the afternoon, spreading and affecting coastal and sea areas at night, and may persist to early morning of the following day. Light winds from variable directions in the morning and at night, and from the Northwest in the afternoon; and wave condition at sea is generally at slight state. Based on forecast models from international climate centres, there is a likelihood that a La Niña event will develop over the Pacific Ocean between October and December.