Seria climate — normals and trends
Seria (Brunei) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 26.4 °C and it receives 2,609 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is May (27.0 °C on average) and the coldest is January (25.8 °C). Rainfall peaks in November.
Seria averages 0 frost days, 100 hot days (≥ 30 °C) and 301 rainy days per year.
Seria has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The hottest day of the period reached 33.2 °C (on 10 August 2009) and the coldest 21.5 °C (on 20 January 1965).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
SeriaBelait
- coords
- 4.61°, 114.32°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.4°C
Average daily high
29.2°C
Average daily low
24.5°C
Annual rainfall
2,609mm
Sunshine / day
9.8h
Mean relative humidity
86%
Average peak wind
13.1km/h
Seasonal range
1.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
100 d/yr
Rainy days (≥ 1 mm)
301 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.5 °C
Average feels-like low
28.9 °C
Average peak gust
25.4 km/h
Tropical nights (≥ 20 °C)
365 d/yr
Solar radiation
19.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.85 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
33.2 °C
10 August 2009
Coldest day
21.5 °C
20 January 1965
Wettest day
170 mm
6 June 1942
Windiest day
40.5 km/h
22 December 2024
Strongest gust
67.7 km/h
22 December 2024
Hottest feels-like
41.4 °C
12 May 2023
Coldest feels-like
22.7 °C
21 January 1950
Sunniest day
12.3 h
2 July 1956
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 29.2 °C | +0.8 °C | 651 mm | +425 mm |
| Feb | 29.2 °C | +0.7 °C | 196 mm | +49 mm |
| Mar | 29.6 °C | +0.5 °C | 274 mm | +121 mm |
| Apr | 30.1 °C | +0.5 °C | 204 mm | +25 mm |
| May | 30.7 °C | +0.8 °C | 164 mm | -44 mm |
| Jun | 30.7 °C | +0.9 °C | 153 mm | -47 mm |
| Jul | 31.0 °C | +1.4 °C | 86 mm | -103 mm |
| Aug | 29.9 °C | +0.3 °C | 276 mm | +73 mm |
| Sep | 29.9 °C | +0.5 °C | 367 mm | +130 mm |
| Oct | 30.1 °C | +1.0 °C | 221 mm | -61 mm |
| Nov | 29.6 °C | +0.7 °C | 300 mm | -4 mm |
| Dec | 29.4 °C | +0.8 °C | 438 mm | +155 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Seria?
Seria has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 26.4 °C and it receives 2,609 mm of precipitation per year.
What is the hottest day ever recorded in Seria?
The hottest day measured in Seria between 1940 and 2025 was 10 August 2009, reaching 33.2 °C.
What is the coldest day in Seria?
The coldest day measured in Seria between 1940 and 2025 was 20 January 1965, at 21.5 °C.
Does it snow in Seria?
Almost never: Seria sees virtually no snow, with about 0 frost days per year.
Has the climate of Seria warmed?
Yes: Seria warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Seria?
The wettest day measured in Seria between 1940 and 2025 was 6 June 1942, with 170 mm of rain in 24 hours.
What was the windiest day in Seria?
The windiest day measured in Seria between 1940 and 2025 was 22 December 2024, with winds reaching 40.5 km/h.
What is the warmest month in Seria?
The warmest month in Seria is May (27.0 °C on average); the coldest is January (25.8 °C).
How much does it rain in Seria?
Seria receives on average 2,609 mm of precipitation per year, spread over about 301 rainy days.
Is it sunny in Seria?
Seria gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.
Are there tropical nights in Seria?
Yes: Seria has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Seria?
In Seria, between 1940 and 2025, the highest apparent temperature reached 41.4 °C on 12 May 2023, and the lowest was 22.7 °C on 21 January 1950.
Compare Seria with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Seria