Perai weather in September

In September, Perai sees average daytime highs of 31°C and overnight lows near 25°C, with 231 mm of rain across 25.5 wet days and about 12 hours of daylight. It is the 9th-warmest and 3rd-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 Perai's 11th-clearest and 7th-windiest month. For the whole year in context, see Perai's year-round climate.

Daytime high
31°
9th warmest
Overnight low
25°
6th coldest
Rainfall
231 mm
25.5 wet days
Daylight
12 hours
7:12 AM – 7:14 PM
Cloud cover
88%
11th clearest
Wind
5 km/h
7th windiest
Solar energy
4.94 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 Perai reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°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)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263125
273125
283125
293125
303125

How September really feels in Perai

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.

Perai weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 24°10915.111.73.6
Feb32° / 25°9814.611.83.2
Mar33° / 25°17322.1122.7
Apr32° / 25°2172712.12.3
May32° / 25°22026.612.22.4
Jun32° / 25°14720.112.32.9
Jul32° / 25°14820.512.33.0
Aug32° / 25°18623.312.22.8
Sep31° / 25°23125.5122.7
Oct31° / 25°3262911.92.5
Nov31° / 25°31427.211.82.6
Dec31° / 24°19120.211.73.3

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 5% of September, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1694
2694
3793
4793
5793
6694
7694
8694
9793
10793
11793
12793
13793
14793
15793
16793
17793
18793
19694
20694
21694
22694
23595
24595
25496
26496
27496
28496
29496
30397

Chance of precipitation in September

Any precipitation

Perai gets around 231 mm of rain over 25.5 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 85% and peaks near 91% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
182
283
383
483
584
684
784
884
984
1084
1184
1284
1384
1484
1584
1684
1784
1884
1984
2085
2185
2285
2386
2487
2587
2688
2789
2889
2990
3091

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 53% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
15149
25149
35149
45149
55149
65149
75149
85149
95149
105050
115050
125050
134951
144852
154852
164753
174654
184555
194456
204456
214357
224357
234357
244258
254258
264258
274258
284258
294258
304258

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 4 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
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 7:15 AM to 7:09 AM, and sunset from 7:21 PM to 7:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.17:157:21
212.17:157:21
312.17:157:20
412.17:147:20
512.17:147:19
612.17:147:19
712.17:147:18
812.17:147:18
912.17:137:17
1012.17:137:17
1112.17:137:16
1212.07:137:16
1312.07:137:15
1412.07:127:15
1512.07:127:14
1612.07:127:14
1712.07:127:13
1812.07:117:13
1912.07:117:12
2012.07:117:12
2112.07:117:11
2212.07:117:11
2312.07:107:10
2412.07:107:10
2512.07:107:09
2612.07:107:08
2712.07:107:08
2812.07:097:07
2912.07:097:07
3012.07:097:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.94 kWh/m².

For context, solar energy here swings from a low near 4.25 kWh/m² to a high of 5.72 kWh/m² in March across the year — September's 4.94 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Perai

In seasonPeak

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

Perai 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 Perai?

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
3.9
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Perai.

What to pack for Perai in September

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

In September, Perai sees daytime highs around 31°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 Perai 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 27 km away) is warmest in May at about 31°C and coldest in January near 29°C.

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

28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar30Tropical
Apr30Tropical
May31Tropical
Jun31Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov29Tropical
Dec29Tropical

UV index in Perai 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 Perai peaks around February 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 16 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 18UV 14Jul 16UV 10
UV index (midday)Level
Jan12Extreme
Feb14Extreme
Mar13Extreme
Apr13Extreme
May10Extreme
Jun11Extreme
Jul10Very high
Aug11Extreme
Sep13Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Perai 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 Perai is worst in March — around 31 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1631 µg/m³Nov 2026 µg/m³
PM2.5 (µg/m³)Level
Jan28Moderate
Feb29Moderate
Mar31Moderate
Apr28Moderate
May27Moderate
Jun28Moderate
Jul31Moderate
Aug29Moderate
Sep30Moderate
Oct30Moderate
Nov26Moderate
Dec27Moderate
Location & terrain

Where is Perai?

Perai sits at 5.4°N, 100.4°E, 5 m above sea level, in Malaysia. The nearest listed city is Butterworth, 3.0 km away.

Topography around Perai

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

Within 3 km, the terrain around Perai has only modest variations in elevation — a maximum elevation change of 33 m around an average of 4 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 842 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,832 m.

The land around Perai is covered by artificial surfaces (53%) and water (28%) within 3 km, water (34%), trees (28%) and artificial surfaces (23%) within 16 km, and trees (45%) and water (43%) within 80 km.

3 km
33 m
16 km
842 m
80 km
1,832 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Butterworth 3.0 km · George Town 6.0 km · Jelutong 7.0 km · Bukit Tengah 7.0 km · Kampung Sungai Glugur 8.0 km · Sungai Dua 8.0 km · Kubang Semang 9.0 km · Glugor 9.0 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 Perai (5.3833°, 100.3833°, elevation 5 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).