Simunjan weather in December

In December, Simunjan sees average daytime highs of 31°C and overnight lows near 24°C, with 376 mm of rain across 29.3 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 2nd-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 0% of the time in December, and the air most often feels miserable.

Daylight stretches from about 11 h 54 min at the start of December to 11 h 54 min by month's end. Set against the rest of the year, December is Simunjan's 12th-clearest and 3rd-windiest month. For the whole year in context, see Simunjan's year-round climate.

Daytime high
31°
10th warmest
Overnight low
24°
2nd coldest
Rainfall
376 mm
29.3 wet days
Daylight
11 h 54 min
6:36 AM – 6:31 PM
Cloud cover
93%
12th clearest
Wind
6 km/h
3rd windiest
Solar energy
4.38 kWh/m²
Travel score
2.5
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

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

A typical December day in Simunjan reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°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, December runs on par with November and on par with January.

20°25°30°35°151015202531
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
203024
213024
223024
233024
243024
253024
263024
273024
283024
293024
303024
313024

How December really feels in Simunjan

Once humidity and wind are folded in, December averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Simunjan weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°38528.711.92.7
Feb30° / 24°29224.4122.8
Mar31° / 24°26627.9122.5
Apr32° / 24°26127.5122.3
May32° / 25°23726.212.12.4
Jun32° / 24°19521.912.12.8
Jul32° / 24°17919.912.13.0
Aug32° / 24°20721.8122.8
Sep32° / 24°25524.7122.6
Oct31° / 24°30828.7122.4
Nov31° / 24°32929.111.92.3
Dec31° / 24°37629.311.92.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 1% of December, with mostly cloudy or overcast conditions the remaining 99%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1298
2298
3298
4298
5298
6298
7298
8298
9199
10199
11199
12199
13199
14199
15199
16199
17199
180100
190100
200100
210100
220100
230100
240100
250100
260100
270100
28199
29199
30199
31199

Chance of precipitation in December

Any precipitation

Simunjan gets around 376 mm of rain over 29.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 95% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
195
295
395
495
594
694
794
894
994
1093
1193
1294
1394
1494
1594
1694
1794
1895
1995
2095
2195
2296
2396
2496
2596
2696
2796
2896
2996
3096
3196

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the miserable band about 65% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
13070
23169
33169
43268
53268
63367
73367
83367
93367
103367
113367
123367
133466
143466
153466
163466
173565
183565
193664
203763
213763
223862
233862
243961
253961
263961
273961
283961
293961
304060
314060

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 54 min at the start of December to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 6:29 AM to 6:43 AM, and sunset from 6:25 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:296:25
211.96:296:25
311.96:306:25
411.96:306:26
511.96:316:26
611.96:316:26
711.96:316:27
811.96:326:27
911.96:326:28
1011.96:336:28
1111.96:336:29
1211.96:346:29
1311.96:346:29
1411.96:356:30
1511.96:356:30
1611.96:366:31
1711.96:366:31
1811.96:366:32
1911.96:376:32
2011.96:376:33
2111.96:386:33
2211.96:386:34
2311.96:396:34
2411.96:396:35
2511.96:406:35
2611.96:406:35
2711.96:416:36
2811.96:416:36
2911.96:426:37
3011.96:426:37
3111.96:436:38

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.38 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.38 kWh/m² to a high of 5.37 kWh/m² in August across the year — December's 4.38 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
314.3Bright
Planning a trip in December

Is December a good time to visit Simunjan?

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

2.5
Sightseeing
7th-best month of the year
3.6
Beach & pool
11th-best month of the year

December is a weaker month for outdoor sightseeing in Simunjan.

What to pack for Simunjan in December

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

In December, Simunjan sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

Sea temperature near Simunjan in December

The nearest coast averages about 29°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 30 km away) 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
Feb28Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov30Tropical
Dec29Tropical

UV index in Simunjan in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Simunjan peaks around February 19 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 19UV 15Jul 13UV 11
UV index (midday)Level
Jan14Extreme
Feb16Extreme
Mar15Extreme
Apr15Extreme
May13Extreme
Jun11Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct14Extreme
Nov12Extreme
Dec11Extreme

Air quality in Simunjan in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Simunjan is worst in September — around 32 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (January, 10 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1131 µg/m³Jan 1510 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar13Moderate
Apr13Moderate
May12Moderate
Jun13Moderate
Jul21Moderate
Aug29Moderate
Sep32Moderate
Oct18Moderate
Nov12Good
Dec11Good
Location & terrain

Where is Simunjan?

Simunjan sits at 1.4°N, 110.8°E, 7 m above sea level, in Malaysia. The nearest listed city is Serian, 32 km away.

Topography around Simunjan

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

Within 3 km, the terrain around Simunjan has only modest variations in elevation — a maximum elevation change of 23 m around an average of 7 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 391 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,408 m.

The land around Simunjan is covered by trees (66%) within 3 km, trees (85%) within 16 km, and trees (71%) and water (25%) within 80 km.

3 km
23 m
16 km
391 m
80 km
1,408 m
treesshrubsgrasslandartificial surfaceswatermangroves
December weather nearby: Serian 32 km · Siburan 39 km · Kuching 50 km · Tebedu 58 km · Bau 67 km · Saratok 76 km · Sri Aman 80 km · Betong 85 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 Simunjan (1.3833°, 110.75°, elevation 7 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).