Niah weather in September

In September, Niah sees average daytime highs of 31°C and overnight lows near 24°C, with 207 mm of rain across 23.9 wet days and about 12 hours of daylight. It is the 6th-warmest and 7th-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 1% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Niah's 7th-clearest and 7th-windiest month. For the whole year in context, see Niah's year-round climate.

Daytime high
31°
6th warmest
Overnight low
24°
7th coldest
Rainfall
207 mm
23.9 wet days
Daylight
12 hours
6:19 AM – 6:20 PM
Cloud cover
84%
7th clearest
Wind
5 km/h
7th windiest
Solar energy
5.37 kWh/m²
Travel score
2.7
out of 10

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 Niah reaches about 31°C in the afternoon and slips back to 24°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.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13124
23124
33124
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143124
153124
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293124
303124

How September really feels in Niah

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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Niah weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°25826.111.82.9
Feb30° / 24°19422.211.93.0
Mar31° / 24°18025.1122.8
Apr32° / 24°21825.912.12.5
May32° / 24°21524.312.22.7
Jun31° / 24°19921.812.22.9
Jul31° / 24°19421.112.23.1
Aug31° / 24°20022.412.12.9
Sep31° / 24°20723.9122.7
Oct31° / 24°27727.911.92.5
Nov31° / 24°28328.811.82.4
Dec30° / 24°31128.511.82.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 90%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11288
21288
31288
41288
51288
61288
71288
81288
91189
101189
111189
121090
13991
14991
15991
16991
17991
18991
19991
201090
211090
221090
23991
24991
25991
26991
27991
28991
29991
30892

Chance of precipitation in September

Any precipitation

Niah gets around 207 mm of rain over 23.9 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 80% and peaks near 85% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
180
280
381
481
580
680
780
880
979
1079
1179
1279
1378
1478
1578
1678
1778
1878
1978
2079
2179
2280
2380
2481
2582
2683
2783
2884
2985
3085

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 71% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
12773
22872
32971
42971
52971
63070
73070
83070
93070
103070
113169
123169
133169
143169
153070
163070
173070
182971
192971
202872
212872
222872
232872
242872
252872
262872
272872
282872
292971
302971

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 6:23 AM to 6:15 AM, and sunset from 6:27 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:236:27
212.16:226:27
312.16:226:26
412.16:226:26
512.16:226:25
612.16:216:25
712.16:216:24
812.06:216:24
912.06:216:23
1012.06:206:23
1112.06:206:22
1212.06:206:22
1312.06:206:22
1412.06:196:21
1512.06:196:21
1612.06:196:20
1712.06:196:20
1812.06:186:19
1912.06:186:19
2012.06:186:18
2112.06:186:18
2212.06:176:17
2312.06:176:17
2412.06:176:16
2512.06:176:16
2612.06:166:15
2712.06:166:15
2812.06:166:14
2912.06:166:14
3012.06:156:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.37 kWh/m².

For context, solar energy here swings from a low near 4.36 kWh/m² to a high of 5.38 kWh/m² in April across the year — September's 5.37 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.4Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.2Bright
305.2Bright
Planning a trip in September

Hazard calendar for Niah

In seasonPeak

In September, Niah sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Niah sits in the Pacific typhoon belt; the season peaks July–October.

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

Is September a good time to visit Niah?

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

2.7
Sightseeing
7th-best month of the year
4.1
Beach & pool
7th-best month of the year

September is a weaker month for outdoor sightseeing in Niah.

What to pack for Niah in September

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

In September, Niah sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Niah 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 offshore is warmest in June 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.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Warm
Mar28Tropical
Apr29Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov29Tropical
Dec29Tropical

UV index in Niah 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 Niah peaks around April 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeApr 15UV 15Nov 22UV 11
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar14Extreme
Apr15Extreme
May14Extreme
Jun12Extreme
Jul11Extreme
Aug12Extreme
Sep13Extreme
Oct14Extreme
Nov11Extreme
Dec11Extreme

Air quality in Niah 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 Niah is worst in September — around 19 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodSep 1819 µg/m³Dec 1510 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb18Moderate
Mar16Moderate
Apr17Moderate
May17Moderate
Jun15Moderate
Jul16Moderate
Aug15Moderate
Sep19Moderate
Oct17Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Niah?

Niah sits at 3.9°N, 113.7°E, 16 m above sea level, in Malaysia. The nearest listed city is Beluru, 45 km away.

Liang

Topography around Niah

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

Within 3 km, the terrain around Niah has only modest variations in elevation — a maximum elevation change of 47 m around an average of 10 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 368 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,291 m.

The land around Niah is covered by trees (88%) within 3 km, trees (81%) within 16 km, and trees (69%) and water (30%) within 80 km.

3 km
47 m
16 km
368 m
80 km
1,291 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Beluru 45 km · Miri 67 km · Marudi 76 km · Sebauh 97 km · Kuala Belait 99 km · Seria 107 km · Bintulu 108 km · Liang 125 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
Muslim 64%Buddhist 19%Christian 9%Hindu 6%

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 Niah (3.862°, 113.7152°, elevation 16 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).