Bau climate — normals and trends
Bau (Malaysia) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 25.7 °C and it receives 3,247 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 (26.3 °C on average) and the coldest is January (25.0 °C). Rainfall peaks in December.
Bau averages 0 frost days, 214 hot days (≥ 30 °C) and 314 rainy days per year.
Bau has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The hottest day of the period reached 36.1 °C (on 2 August 1972) and the coldest 15.6 °C (on 16 February 1949).
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
BauSarawak
- coords
- 1.42°, 110.15°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.7°C
Average daily high
30.3°C
Average daily low
22.9°C
Annual rainfall
3,247mm
Sunshine / day
9.4h
Mean relative humidity
89%
Average peak wind
7.8km/h
Seasonal range
1.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
214 d/yr
Rainy days (≥ 1 mm)
314 d/yr
Annual snowfall
0.0 cm
Average feels-like high
37.0 °C
Average feels-like low
27.5 °C
Average peak gust
24.3 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
18.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.87 · 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
36.1 °C
2 August 1972
Coldest day
15.6 °C
16 February 1949
Wettest day
268 mm
5 January 2012
Windiest day
22.0 km/h
20 January 1952
Strongest gust
55.1 km/h
21 February 1955
Hottest feels-like
43.8 °C
18 August 2016
Coldest feels-like
16.9 °C
16 February 1949
Sunniest day
11.9 h
1 February 1940
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 | 29.1 °C | +0.2 °C | 661 mm | +296 mm |
| Feb | 29.5 °C | +0.2 °C | 396 mm | +116 mm |
| Mar | 30.3 °C | +0.2 °C | 407 mm | +137 mm |
| Apr | 31.4 °C | +0.7 °C | 238 mm | -16 mm |
| May | 32.1 °C | +1.0 °C | 235 mm | +4 mm |
| Jun | 32.2 °C | +1.1 °C | 132 mm | -41 mm |
| Jul | 33.1 °C | +2.0 °C | 87 mm | -83 mm |
| Aug | 31.3 °C | +0.2 °C | 174 mm | -30 mm |
| Sep | 31.3 °C | +0.6 °C | 357 mm | +86 mm |
| Oct | 31.8 °C | +1.4 °C | 188 mm | -129 mm |
| Nov | 31.5 °C | +1.6 °C | 329 mm | -2 mm |
| Dec | 30.4 °C | +1.0 °C | 580 mm | +198 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 Bau?
Bau has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 25.7 °C and it receives 3,247 mm of precipitation per year.
What is the hottest day ever recorded in Bau?
The hottest day measured in Bau between 1940 and 2025 was 2 August 1972, reaching 36.1 °C.
What is the coldest day in Bau?
The coldest day measured in Bau between 1940 and 2025 was 16 February 1949, at 15.6 °C.
Does it snow in Bau?
Almost never: Bau sees virtually no snow, with about 0 frost days per year.
Has the climate of Bau warmed?
Yes: Bau warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bau?
The wettest day measured in Bau between 1940 and 2025 was 5 January 2012, with 268 mm of rain in 24 hours.
What was the windiest day in Bau?
The windiest day measured in Bau between 1940 and 2025 was 20 January 1952, with winds reaching 22.0 km/h.
What is the warmest month in Bau?
The warmest month in Bau is May (26.3 °C on average); the coldest is January (25.0 °C).
How much does it rain in Bau?
Bau receives on average 3,247 mm of precipitation per year, spread over about 314 rainy days.
Is it sunny in Bau?
Bau gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
Are there tropical nights in Bau?
Yes: Bau has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bau?
In Bau, between 1940 and 2025, the highest apparent temperature reached 43.8 °C on 18 August 2016, and the lowest was 16.9 °C on 16 February 1949.
Compare Bau with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bau