Bau weather in September

In September, Bau sees average daytime highs of 31°C and overnight lows near 23°C, with 257 mm of rain across 25 wet days and about 12 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Bau's 6th-clearest and 8th-windiest month. For the whole year in context, see Bau's year-round climate.

Daytime high: 31°; 5th warmest
Overnight low: 23°; 9th coldest
Rainfall: 257 mm; 25 wet days
Daylight: 12 hours; 6:33 AM – 6:34 PM
Cloud cover: 85%; 6th clearest
Wind: 4 km/h; 8th windiest
Solar energy: 5.2 kWh/m²
Travel score: 2.6; out of 10

Bau is human settlement in Malaysia.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Bau year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical September day in Bau reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, September runs on par with August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23

	Avg high (°C)	Avg low (°C)
1	31	23
2	31	23
3	31	23
4	31	23
5	31	23
6	31	23
7	31	23
8	31	23
9	31	23
10	31	23
11	31	23
12	31	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

How September really feels in Bau

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Bau weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	29° / 23°	423	28.9	11.9	2.8
Feb	30° / 23°	311	24.9	12	2.9
Mar	31° / 23°	276	28.2	12	2.6
Apr	31° / 24°	275	27.6	12	2.4
May	32° / 24°	245	26.4	12.1	2.6
Jun	31° / 23°	191	22.1	12.1	2.9
Jul	32° / 23°	181	20.9	12.1	3.1
Aug	32° / 23°	200	22.2	12	2.9
Sep	31° / 23°	257	25	12	2.6
Oct	31° / 23°	328	29	12	2.5
Nov	30° / 23°	361	29.4	11.9	2.4
Dec	30° / 23°	423	29.4	11.9	2.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 90%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	9	9	8	8	8	8	8
Cloudier (%)	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	91	91	92	92	92	92	92

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	10	90
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	10	90
14	10	90
15	10	90
16	10	90
17	10	90
18	10	90
19	10	90
20	10	90
21	10	90
22	10	90
23	10	90
24	9	91
25	9	91
26	8	92
27	8	92
28	8	92
29	8	92
30	8	92

Chance of precipitation in September

Any precipitation

Bau gets around 257 mm of rain over 25 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 84% and peaks near 89% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	82	82	82	82	82	82	82	82	82	82	82	82	82	82	82	82	83	83	83	84	84	85	85	86	86	87	88	88	89	89

	Rain chance (%)
1	82
2	82
3	82
4	82
5	82
6	82
7	82
8	82
9	82
10	82
11	82
12	82
13	82
14	82
15	82
16	82
17	83
18	83
19	83
20	84
21	84
22	85
23	85
24	86
25	86
26	87
27	88
28	88
29	89
30	89

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Oppressive (%)	52	53	53	53	54	54	54	54	54	54	54	54	53	53	52	51	50	49	48	48	47	47	46	46	46	46	46	46	46	46
Miserable (%)	48	47	47	47	46	46	46	46	46	46	46	46	47	47	48	49	50	51	52	52	53	53	54	54	54	54	54	54	54	54

	Oppressive (%)	Miserable (%)
1	52	48
2	53	47
3	53	47
4	53	47
5	54	46
6	54	46
7	54	46
8	54	46
9	54	46
10	54	46
11	54	46
12	54	46
13	53	47
14	53	47
15	52	48
16	51	49
17	50	50
18	49	51
19	48	52
20	48	52
21	47	53
22	47	53
23	46	54
24	46	54
25	46	54
26	46	54
27	46	54
28	46	54
29	46	54
30	46	54

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 hours at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over September. Sunrise moves from 6:38 AM to 6:29 AM, and sunset from 6:40 PM to 6:28 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	6:38	6:38	6:38	6:37	6:37	6:37	6:36	6:36	6:36	6:35	6:35	6:35	6:34	6:34	6:34	6:33	6:33	6:33	6:32	6:32	6:32	6:32	6:31	6:31	6:31	6:30	6:30	6:30	6:29	6:29
Sunset (PM)	6:40	6:40	6:39	6:39	6:38	6:38	6:38	6:37	6:37	6:36	6:36	6:36	6:35	6:35	6:34	6:34	6:34	6:33	6:33	6:32	6:32	6:31	6:31	6:31	6:30	6:30	6:30	6:29	6:29	6:28

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.0	6:38	6:40
2	12.0	6:38	6:40
3	12.0	6:38	6:39
4	12.0	6:37	6:39
5	12.0	6:37	6:38
6	12.0	6:37	6:38
7	12.0	6:36	6:38
8	12.0	6:36	6:37
9	12.0	6:36	6:37
10	12.0	6:35	6:36
11	12.0	6:35	6:36
12	12.0	6:35	6:36
13	12.0	6:34	6:35
14	12.0	6:34	6:35
15	12.0	6:34	6:34
16	12.0	6:33	6:34
17	12.0	6:33	6:34
18	12.0	6:33	6:33
19	12.0	6:32	6:33
20	12.0	6:32	6:32
21	12.0	6:32	6:32
22	12.0	6:32	6:31
23	12.0	6:31	6:31
24	12.0	6:31	6:31
25	12.0	6:31	6:30
26	12.0	6:30	6:30
27	12.0	6:30	6:30
28	12.0	6:30	6:29
29	12.0	6:29	6:29
30	12.0	6:29	6:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.2 kWh/m².

For context, solar energy here swings from a low near 4.21 kWh/m² to a high of 5.32 kWh/m² in August across the year — September's 5.2 kWh/m² sits near the top of that range.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.1	5.1	5.1
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.2	Bright
2	5.2	Bright
3	5.2	Bright
4	5.2	Bright
5	5.2	Bright
6	5.2	Bright
7	5.2	Bright
8	5.2	Bright
9	5.2	Bright
10	5.2	Bright
11	5.2	Bright
12	5.2	Bright
13	5.2	Bright
14	5.2	Bright
15	5.2	Bright
16	5.2	Bright
17	5.2	Bright
18	5.2	Bright
19	5.2	Bright
20	5.2	Bright
21	5.2	Bright
22	5.2	Bright
23	5.2	Bright
24	5.2	Bright
25	5.2	Bright
26	5.2	Bright
27	5.2	Bright
28	5.1	Bright
29	5.1	Bright
30	5.1	Bright

Planning a trip in September

Is September a good time to visit Bau?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.6

Sightseeing

6th-best month of the year

4.0

Beach & pool

4th-best month of the year

September is a weaker month for outdoor sightseeing in Bau.

What to pack for Bau in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Bau sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near Bau in September

The nearest coast averages about 30°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 51 km away) is warmest in May at about 30°C and coldest in February near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	28	28	29	30	30	30	30	30	30	30	29	29
Comfort	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	28	Tropical
Feb	28	Tropical
Mar	29	Tropical
Apr	30	Tropical
May	30	Tropical
Jun	30	Tropical
Jul	30	Tropical
Aug	30	Tropical
Sep	30	Tropical
Oct	30	Tropical
Nov	29	Tropical
Dec	29	Tropical

UV index in Bau in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bau peaks around February 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 11 (extreme).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	15	15	15	13	11	11	12	13	14	12	11
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	15	Extreme
Mar	15	Extreme
Apr	15	Extreme
May	13	Extreme
Jun	11	Extreme
Jul	11	Extreme
Aug	12	Extreme
Sep	13	Extreme
Oct	14	Extreme
Nov	12	Extreme
Dec	11	Extreme

Air quality in Bau in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Bau is worst in August — around 36 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (January, 11 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	11	12	14	15	15	15	23	36	36	21	13	12
Level	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Poor	Poor	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	11	Good
Feb	12	Moderate
Mar	14	Moderate
Apr	15	Moderate
May	15	Moderate
Jun	15	Moderate
Jul	23	Moderate
Aug	36	Poor
Sep	36	Poor
Oct	21	Moderate
Nov	13	Moderate
Dec	12	Moderate

Location & terrain

Where is Bau?

Bau sits at 1.4°N, 110.2°E, 21 m above sea level, in Malaysia. The nearest listed city is Kuching, 25 km away.

Topography around Bau

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bau.

Within 3 km, the terrain around Bau has significant variations in elevation — a maximum elevation change of 285 m around an average of 51 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 971 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,649 m.

The land around Bau is covered by trees (91%) within 3 km, trees (96%) within 16 km, and trees (71%) and water (25%) within 80 km.

3 km

285 m

trees 91%

16 km

971 m

trees 96%

80 km

1,649 m

trees 71%

treesgrasslandartificial surfaceswatermangroves

← August Bau year-round climate October →Best places to visit in September

September weather nearby: Kuching 25 km · Siburan 28 km · Lundu 44 km · Tebedu 49 km · Serian 54 km · Simunjan 67 km · Kota Sambas 95 km · Bengkayang 103 km

Malaysia travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / G / M; 230 V · 50 Hz
Prices: ≈ 32% of US; price level, 2025
GDP per capita: $13,125; 2025
Happiness: 6.0 / 10; World Happiness, 2025
Safe drinking water: 95%; of population, 2024
Homicide rate: 0.7; per 100k, 2023
Road deaths: 22.5; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: High; EF EPI 581
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Bau (1.4167°, 110.15°, elevation 21 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	31	23
2	31	23
3	31	23
4	31	23
5	31	23
6	31	23
7	31	23
8	31	23
9	31	23
10	31	23
11	31	23
12	31	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	10	90
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	10	90
14	10	90
15	10	90
16	10	90
17	10	90
18	10	90
19	10	90
20	10	90
21	10	90
22	10	90
23	10	90
24	9	91
25	9	91
26	8	92
27	8	92
28	8	92
29	8	92
30	8	92

	Rain chance (%)
1	82
2	82
3	82
4	82
5	82
6	82
7	82
8	82
9	82
10	82
11	82
12	82
13	82
14	82
15	82
16	82
17	83
18	83
19	83
20	84
21	84
22	85
23	85
24	86
25	86
26	87
27	88
28	88
29	89
30	89

	Oppressive (%)	Miserable (%)
1	52	48
2	53	47
3	53	47
4	53	47
5	54	46
6	54	46
7	54	46
8	54	46
9	54	46
10	54	46
11	54	46
12	54	46
13	53	47
14	53	47
15	52	48
16	51	49
17	50	50
18	49	51
19	48	52
20	48	52
21	47	53
22	47	53
23	46	54
24	46	54
25	46	54
26	46	54
27	46	54
28	46	54
29	46	54
30	46	54

	Avg high (°C)	Avg low (°C)
1	31	23
2	31	23
3	31	23
4	31	23
5	31	23
6	31	23
7	31	23
8	31	23
9	31	23
10	31	23
11	31	23
12	31	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	10	90
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	10	90
14	10	90
15	10	90
16	10	90
17	10	90
18	10	90
19	10	90
20	10	90
21	10	90
22	10	90
23	10	90
24	9	91
25	9	91
26	8	92
27	8	92
28	8	92
29	8	92
30	8	92

	Rain chance (%)
1	82
2	82
3	82
4	82
5	82
6	82
7	82
8	82
9	82
10	82
11	82
12	82
13	82
14	82
15	82
16	82
17	83
18	83
19	83
20	84
21	84
22	85
23	85
24	86
25	86
26	87
27	88
28	88
29	89
30	89

	Oppressive (%)	Miserable (%)
1	52	48
2	53	47
3	53	47
4	53	47
5	54	46
6	54	46
7	54	46
8	54	46
9	54	46
10	54	46
11	54	46
12	54	46
13	53	47
14	53	47
15	52	48
16	51	49
17	50	50
18	49	51
19	48	52
20	48	52
21	47	53
22	47	53
23	46	54
24	46	54
25	46	54
26	46	54
27	46	54
28	46	54
29	46	54
30	46	54

	Avg high (°C)	Avg low (°C)
1	31	23
2	31	23
3	31	23
4	31	23
5	31	23
6	31	23
7	31	23
8	31	23
9	31	23
10	31	23
11	31	23
12	31	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	10	90
4	10	90
5	10	90
6	10	90
7	10	90
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	10	90
14	10	90
15	10	90
16	10	90
17	10	90
18	10	90
19	10	90
20	10	90
21	10	90
22	10	90
23	10	90
24	9	91
25	9	91
26	8	92
27	8	92
28	8	92
29	8	92
30	8	92

	Rain chance (%)
1	82
2	82
3	82
4	82
5	82
6	82
7	82
8	82
9	82
10	82
11	82
12	82
13	82
14	82
15	82
16	82
17	83
18	83
19	83
20	84
21	84
22	85
23	85
24	86
25	86
26	87
27	88
28	88
29	89
30	89

	Oppressive (%)	Miserable (%)
1	52	48
2	53	47
3	53	47
4	53	47
5	54	46
6	54	46
7	54	46
8	54	46
9	54	46
10	54	46
11	54	46
12	54	46
13	53	47
14	53	47
15	52	48
16	51	49
17	50	50
18	49	51
19	48	52
20	48	52
21	47	53
22	47	53
23	46	54
24	46	54
25	46	54
26	46	54
27	46	54
28	46	54
29	46	54
30	46	54