Isabela weather in December

In December, Isabela sees average daytime highs of 30°C and overnight lows near 24°C, with 168 mm of rain across 18 wet days and about 11.4 hours of daylight. It is the 8th-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 19% of the time in December, and the air most often feels miserable.

Daylight stretches from about 11 h 24 min at the start of December to 11 h 24 min by month's end. Set against the rest of the year, December is Isabela's 5th-clearest and 4th-windiest month. For the whole year in context, see Isabela's year-round climate.

Daytime high
30°
8th warmest
Overnight low
24°
4th coldest
Rainfall
168 mm
18 wet days
Daylight
11 h 24 min
6:02 AM – 5:26 PM
Cloud cover
72%
5th clearest
Wind
8 km/h
4th windiest
Solar energy
4.22 kWh/m²
Travel score
3.9
out of 10

Isabela is municipality of the Philippines in the province of Negros Occidental.

Density
89/km²
people per km²

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

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

A typical December day in Isabela reaches about 30°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 28°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
93024
103024
113024
123024
133024
143024
153024
163024
173024
183024
193024
203024
213024
223024
233024
243024
253024
263024
273024
283024
293024
303024
313024

How December really feels in Isabela

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.

Isabela weather by month

How December compares with the rest of the year at a glance. December is the 8th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°8813.211.54.4
Feb31° / 23°819.911.74.4
Mar32° / 24°7810.511.94.0
Apr33° / 25°7911.412.23.2
May33° / 25°1952412.52.5
Jun31° / 24°29627.912.62.4
Jul30° / 24°34129.312.52.6
Aug30° / 24°29327.712.32.7
Sep30° / 24°30928.412.12.6
Oct30° / 24°27528.211.82.7
Nov31° / 24°16820.511.53.3
Dec30° / 24°1681811.43.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23169
33268
43268
53169
63268
73367
83367
93268
103268
113268
123268
133268
143367
153268
163268
173268
183268
193268
203268
213268
223268
233268
243268
253268
263268
273367
283367
293367
303466
313466

Chance of precipitation in December

Any precipitation

Isabela gets around 168 mm of rain over 18 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 57% and peaks near 64% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
161
261
362
462
563
663
764
864
964
1064
1164
1263
1362
1461
1560
1659
1757
1856
1955
2054
2153
2252
2351
2451
2550
2649
2748
2848
2947
3047
3147

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
103763
203763
303862
403961
503961
604060
704159
804159
904258
1004357
1104456
1204555
1304654
1404753
1504852
1614950
1715050
1815049
1915148
2015247
2115445
2225444
2325543
2425642
2525741
2635839
2735938
2836037
2936235
3036334
3146432

Wind in December

Winds average 8 km/h in December.

Across December, 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.

051015151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 24 min at the start of December to 11 h 24 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 5:54 AM to 6:09 AM, and sunset from 5:21 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.45:545:21
211.45:555:21
311.45:555:22
411.45:565:22
511.45:565:22
611.45:575:23
711.45:575:23
811.45:585:23
911.45:585:24
1011.45:595:24
1111.45:595:24
1211.46:005:25
1311.46:005:25
1411.46:015:26
1511.46:025:26
1611.46:025:26
1711.46:035:27
1811.46:035:27
1911.46:035:28
2011.46:045:28
2111.46:045:29
2211.46:055:29
2311.46:055:30
2411.46:065:30
2511.46:065:31
2611.46:075:31
2711.46:075:32
2811.46:085:32
2911.46:085:33
3011.46:085:33
3111.46:095:34

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.22 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.22 kWh/m² to a high of 6.17 kWh/m² in April across the year — December's 4.22 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.4Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.4Bright
304.4Bright
314.4Bright
Planning a trip in December

Hazard calendar for Isabela

In seasonPeak

In December, Isabela sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.

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

Isabela's rainy season runs May–December, 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 December a good time to visit Isabela?

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

3.9
Sightseeing
4th-best month of the year
5.5
Beach & pool
5th-best month of the year

December is a weaker month for outdoor sightseeing in Isabela.

What to pack for Isabela in December

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

In December, Isabela sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. About 18 days see rain.

light clothesrain gear

Sea temperature near Isabela in December

The nearest coast averages about 28°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 15 km away) is warmest in June at about 30°C and coldest in February near 27°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
Jan27Warm
Feb27Warm
Mar28Warm
Apr29Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in Isabela in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Isabela peaks around March 24 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 24UV 14Nov 21UV 9
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar14Extreme
Apr14Extreme
May12Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec10Very high

Air quality in Isabela 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 Isabela is worst in September — around 17 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 2317 µg/m³Feb 1113 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar14Moderate
Apr15Moderate
May16Moderate
Jun16Moderate
Jul17Moderate
Aug16Moderate
Sep17Moderate
Oct17Moderate
Nov15Moderate
Dec14Moderate
Location & terrain

Where is Isabela?

Isabela sits at 10.2°N, 123.0°E, 30 m above sea level, in Philippines. The nearest listed city is Tinongan, 5.0 km away.

Topography around Isabela

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

Within 3 km, the terrain around Isabela has significant variations in elevation — a maximum elevation change of 323 m around an average of 30 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,233 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,458 m.

The land around Isabela is covered by cropland (61%) and trees (32%) within 3 km, trees (50%) and cropland (38%) within 16 km, and trees (45%) and water (41%) within 80 km.

3 km
323 m
16 km
1,233 m
80 km
2,458 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Tinongan 5.0 km · La Castellana 14 km · Binalbagan 14 km · Hinigaran 17 km · Himamaylan 17 km · Suay 23 km · La Carlota 25 km · Kabankalan 31 km

Philippines travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
230 V · 60 Hz
Prices
≈ 33% of US
price level, 2025
GDP per capita
$4,171
2025
Happiness
6.2 / 10
World Happiness, 2025
Safe drinking water
48%
of population, 2024
Homicide rate
4.3
per 100k, 2023
Road deaths
12
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 569
Religion
Roman Catholic 79%other 8%Muslim 6%other Christian 4%

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 Isabela (10.2048°, 122.9888°, elevation 30 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).