Mersing weather in September

In September, Mersing sees average daytime highs of 30°C and overnight lows near 25°C, with 169 mm of rain across 25.7 wet days and about 12 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 5% of the time in September, and the air most often feels miserable.

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 Mersing's 8th-clearest and 8th-windiest month. For the whole year in context, see Mersing's year-round climate.

Daytime high
30°
4th warmest
Overnight low
25°
2nd coldest
Rainfall
169 mm
25.7 wet days
Daylight
12 hours
6:59 AM – 6:59 PM
Cloud cover
79%
8th clearest
Wind
8 km/h
8th windiest
Solar energy
5.46 kWh/m²
Travel score
3.0
out of 10

Mersing is town in Johor and district capital of Mersing District.

Founded
1977

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical September day in Mersing reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 31°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)
13025
23025
33025
43025
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
253025
263025
273025
283025
293025
303025

How September really feels in Mersing

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.

Mersing weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 25°28222.511.94.3
Feb29° / 25°12417.111.94.4
Mar29° / 25°17122.1123.7
Apr30° / 25°17125.112.13.0
May31° / 26°16726.812.12.8
Jun30° / 25°13724.312.13.1
Jul30° / 25°1342412.13.3
Aug30° / 25°14925.912.13.1
Sep30° / 25°16925.7123.0
Oct30° / 25°23027.111.93.0
Nov29° / 25°36628.811.92.9
Dec28° / 25°41927.411.93.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12278
22278
32278
42278
52278
62278
72179
82080
92080
101981
111981
121981
131882
141882
151882
161882
171783
181783
191783
201783
211684
221684
231684
241684
251684
261585
271585
281585
291585
301585

Chance of precipitation in September

Any precipitation

Mersing gets around 169 mm of rain over 25.7 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 86% and peaks near 88% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
188
288
387
487
587
687
787
887
986
1086
1186
1286
1386
1485
1585
1685
1785
1885
1985
2085
2185
2285
2384
2484
2584
2684
2784
2884
2984
3084

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 70% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
13070
23070
33169
43169
53169
63268
73268
83268
93268
103268
113268
123268
133169
143169
153070
163070
172971
182872
192872
202872
212872
222872
232872
242872
252872
262872
272872
282872
292872
302872

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
287calm
297calm
307calm

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 7:03 AM to 6:55 AM, and sunset from 7:06 PM to 6:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.07:037:06
212.07:037:05
312.07:027:05
412.07:027:05
512.07:027:04
612.07:027:04
712.07:017:03
812.07:017:03
912.07:017:02
1012.07:007:02
1112.07:007:02
1212.07:007:01
1312.06:597:01
1412.06:597:00
1512.06:597:00
1612.06:596:59
1712.06:586:59
1812.06:586:58
1912.06:586:58
2012.06:576:58
2112.06:576:57
2212.06:576:57
2312.06:566:56
2412.06:566:56
2512.06:566:55
2612.06:566:55
2712.06:556:55
2812.06:556:54
2912.06:556:54
3012.06:556:53

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.46 kWh/m².

For context, solar energy here swings from a low near 4.01 kWh/m² to a high of 5.59 kWh/m² in March across the year — September's 5.46 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Hazard calendar for Mersing

In seasonPeak

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

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

Mersing's rainy season runs October–January, when most of the year's rain falls.

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

Is September a good time to visit Mersing?

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

3.0
Sightseeing
8th-best month of the year
4.1
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Mersing.

What to pack for Mersing in September

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

In September, Mersing sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

Sea temperature near Mersing in September

The nearest coast averages about 29°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 22 km away) is warmest in May at about 30°C and coldest in January 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
Jan28Warm
Feb28Warm
Mar29Tropical
Apr30Tropical
May30Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in Mersing in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mersing peaks around February 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeExtremeFeb 21UV 15Jul 11UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Very high
Aug13Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Mersing 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 Mersing is worst in September — around 33 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (January, 12 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1633 µg/m³Jan 1912 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar15Moderate
Apr20Moderate
May24Moderate
Jun25Moderate
Jul28Moderate
Aug29Moderate
Sep33Moderate
Oct28Moderate
Nov17Moderate
Dec13Moderate
Location & terrain

Where is Mersing?

Mersing sits at 2.4°N, 103.8°E, 8 m above sea level, in Malaysia. The nearest listed city is Tioman, 54 km away.

Topography around Mersing

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

Within 3 km, the terrain around Mersing has only modest variations in elevation — a maximum elevation change of 92 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 270 m; within 80 km, large variations in elevation — a maximum elevation change of 1,017 m.

The land around Mersing is covered by trees (42%) and water (39%) within 3 km, trees (55%) and water (40%) within 16 km, and water (52%) and trees (46%) within 80 km.

3 km
92 m
16 km
270 m
80 km
1,017 m
treesgrasslandartificial surfacesbare terrainwater
September weather nearby: Tioman 54 km · Bandar Tenggara 67 km · Kampung Batu Empat 73 km · Kluang 73 km · Kota Tinggi 77 km · Kampung Sedenak 87 km · Simpang Renggam 89 km · Kampung Simpang Renggam 90 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 Mersing (2.4312°, 103.8405°, elevation 8 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).