Climate and Average Weather Year Round in Brunei Brunei
The climate in Brunei is hot, oppressive, and overcast. Over the course of the year, the temperature typically varies from 75°F to 90°F and is rarely below 73°F or above 93°F.
Based on the beach/pool score, the best time of year to visit Brunei for hot-weather activities is from late January to late March.
Climate in Brunei
The temperature in Brunei varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.
Average High and Low Temperature in Brunei
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in Brunei
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
In Brunei, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Brunei begins around January 9 and lasts for 3.2 months, ending around April 14.
The clearest month of the year in Brunei is March, during which on average the sky is clear, mostly clear, or partly cloudy 22% of the time.
The cloudier part of the year begins around April 14 and lasts for 8.8 months, ending around January 9.
The cloudiest month of the year in Brunei is November, during which on average the sky is overcast or mostly cloudy 90% of the time.
Cloud Cover Categories in Brunei
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Brunei varies significantly throughout the year.
The wetter season lasts 9.2 months, from April 10 to January 15, with a greater than 50% chance of a given day being a wet day. The month with the most wet days in Brunei is November, with an average of 20.8 days with at least 0.04 inches of precipitation.
The drier season lasts 2.8 months, from January 15 to April 10. The month with the fewest wet days in Brunei is March, with an average of 10.6 days with at least 0.04 inches of precipitation.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Brunei is November, with an average of 20.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 71% on November 22.
Daily Chance of Precipitation in Brunei
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Brunei experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Brunei. The month with the most rain in Brunei is November, with an average rainfall of 11.0 inches.
The month with the least rain in Brunei is March, with an average rainfall of 4.0 inches.
Average Monthly Rainfall in Brunei
The length of the day in Brunei does not vary substantially over the course of the year, staying within 23 minutes of 12 hours throughout. In 2023, the shortest day is December 22, with 11 hours, 52 minutes of daylight; the longest day is June 21, with 12 hours, 23 minutes of daylight.
Hours of Daylight and Twilight in Brunei
The earliest sunrise is at 6:05 AM on October 26, and the latest sunrise is 31 minutes later at 6:36 AM on February 5. The earliest sunset is at 6:03 PM on November 9, and the latest sunset is 35 minutes later at 6:38 PM on July 18.
Daylight saving time (DST) is not observed in Brunei during 2023.
Sunrise & Sunset with Twilight in Brunei
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.
Solar Elevation and Azimuth in Brunei
The figure below presents a compact representation of key lunar data for 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.
Moon Rise, Set & Phases in Brunei
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level in Brunei, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 100% throughout.
Humidity Comfort Levels in Brunei
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Brunei experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 3.0 months, from December 13 to March 14, with average wind speeds of more than 6.0 miles per hour. The windiest month of the year in Brunei is January, with an average hourly wind speed of 7.2 miles per hour.
The calmer time of year lasts for 9.0 months, from March 14 to December 13. The calmest month of the year in Brunei is May, with an average hourly wind speed of 4.7 miles per hour.
Average Wind Speed in Brunei
The predominant average hourly wind direction in Brunei varies throughout the year.
The wind is most often from the west for 6.4 months, from May 3 to November 15, with a peak percentage of 49% on September 2. The wind is most often from the north for 5.6 months, from November 15 to May 3, with a peak percentage of 68% on January 1.
Wind Direction in Brunei
Brunei is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 5.1 months, from April 22 to September 25, with an average temperature above 85°F. The month of the year in Brunei with the warmest water is June, with an average temperature of 86°F.
The time of year with cooler water lasts for 1.9 months, from January 14 to March 12, with an average temperature below 82°F. The month of the year in Brunei with the coolest water is February, with an average temperature of 81°F.
Average Water Temperature in Brunei
To characterize how pleasant the weather is in Brunei throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Brunei for general outdoor tourist activities are from late January to late March and from late June to early July, with a peak score in the first week of March.
Tourism Score in Brunei
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Brunei for hot-weather activities is from late January to late March, with a peak score in the first week of March.
Beach/Pool Score in Brunei
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
Temperatures in Brunei are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in Brunei
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
Growing Degree Days in Brunei
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences some seasonal variation over the course of the year.
The brighter period of the year lasts for 1.5 months, from February 15 to March 31, with an average daily incident shortwave energy per square meter above 5.5 kWh. The brightest month of the year in Brunei is March, with an average of 5.7 kWh.
The darker period of the year lasts for 2.1 months, from October 17 to December 19, with an average daily incident shortwave energy per square meter below 4.5 kWh. The darkest month of the year in Brunei is November, with an average of 4.2 kWh.
Average Daily Incident Shortwave Solar Energy in Brunei
For the purposes of this report, the geographical coordinates of Brunei are 4.500 deg latitude, 114.667 deg longitude, and 0 ft elevation.
The topography within 2 miles of Brunei is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).
The area within 2 miles of Brunei is covered by trees (97%), within 10 miles by trees (96%), and within 50 miles by trees (54%) and water (31%).
This report illustrates the typical weather in Brunei, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
The details of the data sources used for this report can be found on the Brunei Airport page.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.
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