Julau weather in September

In September, Julau sees average daytime highs of 31°C and overnight lows near 23°C, with 237 mm of rain across 24.7 wet days and about 12 hours of daylight. It is the 6th-warmest and 5th-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 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 Julau's 6th-clearest and 7th-windiest month. For the whole year in context, see Julau's year-round climate.

Daytime high
31°
6th warmest
Overnight low
23°
8th coldest
Rainfall
237 mm
24.7 wet days
Daylight
12 hours
6:26 AM – 6:27 PM
Cloud cover
84%
6th clearest
Wind
4 km/h
7th windiest
Solar energy
4.83 kWh/m²
Travel score
2.8
out of 10

Julau is town in Malaysia.

Density
9/km²
people per km²

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 31°C through the month.

A typical September day in Julau 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 28°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)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123

How September really feels in Julau

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.

Julau weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°30227.311.92.9
Feb30° / 23°23523.111.93.0
Mar31° / 23°22126.4122.8
Apr31° / 24°23026.7122.6
May31° / 24°20425.412.12.8
Jun31° / 24°16721.512.13.1
Jul31° / 23°1642012.13.3
Aug31° / 23°18421.512.13.1
Sep31° / 23°23724.7122.8
Oct30° / 23°25827.8122.7
Nov30° / 23°28128.311.92.6
Dec30° / 23°30728.711.92.7

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 8% 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
81189
91189
101189
111189
121189
13991
14991
15991
16991
17991
18991
19991
20991
21892
22892
23892
24892
25892
26892
27892
28793
29793
30793

Chance of precipitation in September

Any precipitation

Julau gets around 237 mm of rain over 24.7 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 82% and peaks near 88% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
180
281
381
481
581
680
780
880
980
1079
1179
1279
1380
1480
1580
1681
1781
1882
1983
2083
2184
2285
2385
2486
2586
2687
2787
2887
2988
3088

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
15941
25941
35941
45941
55941
65842
75842
85842
95743
105743
115743
125644
135644
145545
155446
165446
175347
185248
195149
205149
215149
225149
235149
245149
255149
265248
275248
285347
295446
305545

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.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 6:31 AM to 6:22 AM, and sunset from 6:33 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:316:33
212.06:316:33
312.06:306:32
412.06:306:32
512.06:306:32
612.06:296:31
712.06:296:31
812.06:296:30
912.06:296:30
1012.06:286:30
1112.06:286:29
1212.06:286:29
1312.06:276:28
1412.06:276:28
1512.06:276:27
1612.06:266:27
1712.06:266:27
1812.06:266:26
1912.06:256:26
2012.06:256:25
2112.06:256:25
2212.06:246:24
2312.06:246:24
2412.06:246:24
2512.06:246:23
2612.06:236:23
2712.06:236:22
2812.06:236:22
2912.06:226:22
3012.06:226:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.83 kWh/m².

For context, solar energy here swings from a low near 3.91 kWh/m² to a high of 4.99 kWh/m² in August across the year — September's 4.83 kWh/m² sits near the top of that range.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.9Bright
174.9Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Is September a good time to visit Julau?

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

2.8
Sightseeing
6th-best month of the year
4.1
Beach & pool
6th-best month of the year

September is a weaker month for outdoor sightseeing in Julau.

What to pack for Julau in September

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

In September, Julau 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

UV index in Julau 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 Julau peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 15UV 15Jul 14UV 11
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar16Extreme
Apr15Extreme
May14Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct14Extreme
Nov12Extreme
Dec11Extreme

Air quality in Julau 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 Julau is worst in September — around 26 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodSep 1325 µg/m³Dec 1411 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar13Moderate
Apr14Moderate
May13Moderate
Jun14Moderate
Jul16Moderate
Aug22Moderate
Sep26Moderate
Oct17Moderate
Nov11Good
Dec11Good
Location & terrain

Where is Julau?

Julau sits at 2.0°N, 111.9°E, 27 m above sea level, in Malaysia. The nearest listed city is Sibu Jaya, 26 km away.

Topography around Julau

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

Within 3 km, the terrain around Julau has only modest variations in elevation — a maximum elevation change of 114 m around an average of 42 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 249 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,241 m.

The land around Julau is covered by trees (98%) within 3 km, trees (99%) within 16 km, and trees (93%) within 80 km.

3 km
114 m
16 km
249 m
80 km
1,241 m
treesgrasslandartificial surfaceswatermangroves
September weather nearby: Sibu Jaya 26 km · Kanowit 28 km · Pakan 30 km · Sibu 33 km · Maradong 34 km · Sarikei 46 km · Saratok 72 km · Selangau 72 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 Julau (2.0167°, 111.9167°, elevation 27 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. 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).