Brunei Climate – July 2026 Update
Summary
Brunei experienced exceptional heat through early mid-2026, recording its 4th warmest July in 87 years of weather records. Above-average temperatures stretched across the full three-month season, fitting into a wider global pattern of elevated heat. While high humidity and seasonal wind shifts continue to shape local weather, elevated temperatures are expected to persist over the next 1-3 months.
This month in numbers
In July 2026, Brunei recorded an average temperature of 27.16°C, which sits 1.4°C above the 1961-1990 baseline. This made it the 4th warmest July in 87 years of records, trailing only behind the record high of 27.69°C set in 2025. Over the three-month period from May to July 2026, the country averaged 27.2°C, an anomaly of +1.2°C that ranks as the 5th warmest such season on record.
What changed
The elevated heat in Brunei reflects wider global trends, as the global land temperature for May to July 2026 marked the 2nd warmest such period on record with a +1.5°C anomaly. July itself ranked 3rd globally at +1.6°C above baseline. Locally, Brunei has warmed by 1.26°C since the 1961-1990 baseline. While 2024 stands as the hottest year on record at 27.3°C, 2025 ranked 6th warmest at 26.8°C, showing that recent months remain consistently near historic highs.
What’s driving change?
Brunei's climate is heavily influenced by regional pressure systems, where can alter precipitation patterns and cloud formation. Ocean-atmosphere interaction across the Pacific, driven by ENSO, also modulates regional sea temperatures and convective storms across the South China Sea. Furthermore, global thermal trends reflect how waters, driving ambient heat upward even in tropical maritime settings.
Looking ahead
Seasonal outlooks suggest that ambient temperatures across the region are likely to remain above historic averages over the next 1-3 months as the southwest monsoon period continues.
Generated by Gemini from climate data and web sources
At a Glance
Temperature – Average
Climate Map – Global
Source: NOAA Climate at a Glance (countries & continents) · Met Office (UK) · US states & climate regions. Anomalies are vs the 1961–1990 baseline. See methodology.
Typical Climate – Brunei
Köppen Af · TropicalBrunei has a tropical climate (Köppen Af: Tropical rainforest), with little variation in temperature or rainfall across the year. May is typically the warmest month, averaging 27.5°C, while February is the coldest at 26.4°C. Annual precipitation averages around 3577mm, spread fairly evenly across the year.
Monthly climate normals (2016–2025) - bar colour and height show average temperature, the shaded area shows average monthly precipitation.
Data: Our World in Data / NOAA (precipitation: GPCC (DWD); frost: World Bank CCKP).
Long-Term Trends
Combined Timeline – Brunei
Right axis: everything else standardized to standard deviations (σ) from its own average, since mm/hours/days aren't directly comparable to °C or to each other.
Data: Our World in Data / NOAA (precipitation: GPCC (DWD); frost: World Bank CCKP).
Heatwave Days – Brunei
Warm Spell Duration Index (WSDI) - the WMO/ETCCDI heatwave measure: days in a 6+ day run above the local 90th-percentile temperature for that time of year.
Data: World Bank Climate Change Knowledge Portal (ERA5-derived). Refreshed roughly 1-2x/year, ~7-8 months behind present.
Year-on-Year Trends
The 4byo Climate Helix – Brunei
Data: Our World in Data / NOAA (precipitation: GPCC (DWD); frost: World Bank CCKP).
Monthly Temperature – Brunei
Background lines show the last 40 years (plus the record year and its opposite, wherever they fall).
Data: Our World in Data / NOAA (precipitation: GPCC (DWD); frost: World Bank CCKP).
Records – Brunei
Our World in Data / NOAA (precipitation: GPCC (DWD); frost: World Bank CCKP) - Anomalies vs 1901-2000 mean
Shifting Seasons
Weakly seasonalKöppen Af · TropicalBrunei is weakly seasonal - temperature barely changes across the year (1.2°C range) and rainfall is fairly even. The clearest climate signal here is overall warming: monthly temperature has risen in every month.
Baseline vs recent monthly temperature climatology. Biggest warming: Nov (+2.0°C).
Data: Our World in Data / NOAA (precipitation: GPCC (DWD); frost: World Bank CCKP).
Emissions & Energy
Explore
Explore Climate Data
Data Sources
Data Sources for Brunei
Every figure on this page is sourced from official, openly published climate datasets. Anomalies are calculated against the 1961–1990 baseline (temperature) and 1991–2020 (rainfall, sunshine, frost) - see the Methodology & Sources page for the complete dataset list and update calendar.
Country-level temperature anomaly, sourced from Copernicus ERA5 and Hadley HadCRUT5.
Annual country and global CO₂ emissions, from the Global Carbon Project.
Monthly rainfall - Global Precipitation Climatology Centre (DWD) preferred, World Bank CCKP/CRU TS fallback where GPCC lacks direct coverage.
Frost Days and Heatwave Days (Warm Spell Duration Index), ERA5-derived. World Bank Climate Change Knowledge Portal.
Monthly snow water-equivalent, Global Precipitation Climatology Centre (DWD).
FAQs
FAQs
How is the climate in Brunei changing?
Brunei is warming in line with the rest of the world. The page above shows the latest monthly temperature anomaly versus the 1961-1990 baseline, the long-term annual trend, and the region's rank in the historical record. The headline panel also shows the long-term trend rate per decade and the warmest and coolest years on file.
What is the climate like in Brunei?
Brunei has a tropical climate (Köppen Af: Tropical rainforest), with little variation in temperature or rainfall across the year. May is typically the warmest month, averaging 27.5°C, while February is the coldest at 26.4°C. Annual precipitation averages around 3577mm, spread fairly evenly across the year.
Where does the climate data for Brunei come from?
Climate data for Brunei comes from Our World in Data, sourcing Copernicus ERA5 and HadCRUT5 (national temperature anomaly) and the Global Carbon Project via Our World in Data (CO₂ emissions), refreshed every month, when the upstream temperature and rainfall data are refreshed.
What is the climate baseline used on this page?
Anomalies on this page are calculated against the 1961-1990 climatological baseline, which is the standard reference period used by the Met Office, NOAA, IPCC and most national climate services. Some panels also show the source-native 1901-2000 (NOAA) or 1991-2020 (WMO) baselines for verification. See Methodology & Sources for the full reference.
Which areas does the Brunei climate data cover?
Temperature, rainfall and emissions data for Brunei Brunei climate profile with temperature anomalies, precipitation (GPCC), warm/wet-season shift analysis, CO₂ emissions (Our World in Data) and electricity generation mix — all vs the 1961–1990 baseline..
How often is the Brunei climate update refreshed?
The Brunei climate update is refreshed monthly, typically a few days after the previous month closes and the upstream provider (Met Office HadUK-Grid, NOAA Climate at a Glance, Copernicus ERA5 or the Global Carbon Project) publishes its update. See the Climate Rankings for cross-region comparisons.
What counts as a Heatwave Day on the Brunei climate page?
Heatwave Days use the Warm Spell Duration Index (WSDI) - the WMO/ETCCDI-standard heatwave measure: days that are part of a run of 6 or more consecutive days above the local 90th-percentile temperature for that calendar day. The 90th-percentile threshold varies by time of year (a hot day in January is judged differently to one in July) but is fixed to the 1961-1990 baseline for every year shown - it does not shift as the climate warms, which is why Heatwave Days trend upward over time.
Does the Brunei climate page include frost and snow data?
Yes. Frost Days (days with a minimum temperature below 0°C, World Bank CCKP) and snow water-equivalent (GPCC) are shown alongside temperature and precipitation, each measured against the 1961-1990 baseline where a like-for-like historical comparison is available.