Bay weather in December

In December, Bay sees average daytime highs of 27°C and overnight lows near 24°C, with 141 mm of rain across 10.4 wet days and about 11.2 hours of daylight. It is the 10th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 24% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 11 h 12 min at the start of December to 11 h 12 min by month's end. Set against the rest of the year, December is Bay's 5th-clearest and 1st-windiest month. For the whole year in context, see Bay's year-round climate.

Daytime high
27°
10th warmest
Overnight low
24°
4th coldest
Rainfall
141 mm
10.4 wet days
Daylight
11 h 12 min
6:16 AM – 5:26 PM
Cloud cover
66%
5th clearest
Wind
13 km/h
1st windiest
Solar energy
3.79 kWh/m²
Travel score
6.3
out of 10

Bay is municipality of the Philippines in the province of Laguna.

Density
786/km²
people per km²
Founded
1578

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 27°C through the month.

A typical December day in Bay reaches about 27°C in the afternoon and slips back to 24°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 29°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12824
22824
32824
42824
52824
62824
72824
82824
92824
102724
112724
122724
132724
142724
152724
162724
172724
182724
192724
202724
212724
222724
232724
242724
252724
262724
272724
282724
292724
302724
312724

How December really feels in Bay

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

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Bay weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 23°404.611.37.2
Feb27° / 23°273.811.57.3
Mar29° / 24°334.611.96.6
Apr30° / 25°376.112.35.3
May31° / 25°17019.212.63.5
Jun31° / 25°24325.812.82.8
Jul30° / 25°36828.912.82.8
Aug29° / 25°30127.912.53.0
Sep29° / 25°31427.112.13.0
Oct29° / 25°19419.411.74.1
Nov28° / 25°10310.611.35.6
Dec27° / 24°14110.411.26.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 21% of December, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24555
34555
44456
54456
64555
74555
84555
94555
104555
114456
124456
134456
144456
154456
164555
174555
184555
194456
204357
214357
224357
234456
244456
254555
264555
274555
284654
294654
304753
314753

Chance of precipitation in December

Any precipitation

Bay gets around 141 mm of rain over 10.4 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 32% and peaks near 38% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
234
335
436
536
637
737
838
938
1038
1138
1238
1337
1436
1535
1634
1733
1832
1932
2031
2130
2230
2329
2429
2528
2627
2726
2825
2925
3024
3123

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 80% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1057718
2067717
3067717
4057916
5058015
6058015
7058114
8058114
9058213
10058312
11068212
12068311
13068410
14078310
1508839
1609838
1709838
18011827
19012817
20013816
21014806
22015805
23016795
24017794
25018784
26019774
27020773
28021763
29022753
30022753
31123742

Wind in December

Winds average 13 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
112light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 12 min at the start of December to 11 h 12 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 6:08 AM to 6:23 AM, and sunset from 5:21 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.26:085:21
211.26:095:21
311.26:095:22
411.26:105:22
511.26:105:22
611.26:115:22
711.26:115:23
811.26:125:23
911.26:125:23
1011.26:135:24
1111.26:135:24
1211.26:145:24
1311.26:145:25
1411.26:155:25
1511.26:165:26
1611.26:165:26
1711.26:175:26
1811.26:175:27
1911.26:185:27
2011.26:185:28
2111.26:195:28
2211.26:195:29
2311.26:195:29
2411.26:205:30
2511.26:205:30
2611.26:215:31
2711.26:215:31
2811.26:225:32
2911.26:225:32
3011.26:225:33
3111.26:235:33

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.79 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.79 kWh/m² to a high of 6.37 kWh/m² in April across the year — December's 3.79 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
14.0Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.8Moderate
103.8Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.8Moderate
163.8Moderate
173.8Moderate
183.8Moderate
193.8Moderate
203.8Moderate
213.8Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
294.0Moderate
304.0Moderate
314.0Bright
Planning a trip in December

Hazard calendar for Bay

In seasonPeak

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

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

Bay's monsoon runs May–October, when most of the year's rain falls.

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

Is December a good time to visit Bay?

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

6.3
Sightseeing
4th-best month of the year
6.6
Beach & pool
6th-best month of the year

December is a reasonable time to visit Bay for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Bay in December

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

In December, Bay sees daytime highs around 27°C and nights near 24°C. Pack light clothes. Worth having: rain gear. About 10 days see rain.

light clothesrain gear

Sea temperature near Bay in December

The nearest coast averages about 27°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 49 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
Mar27Warm
Apr29Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Bay in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bay peaks around August 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 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 highAug 18UV 14Nov 22UV 9
UV index (midday)Level
Jan10Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep13Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Bay 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 Bay is worst in September — around 32 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (February, 15 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1631 µg/m³Feb 1515 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb15Moderate
Mar17Moderate
Apr17Moderate
May23Moderate
Jun29Moderate
Jul28Moderate
Aug28Moderate
Sep32Moderate
Oct27Moderate
Nov19Moderate
Dec16Moderate
Location & terrain

Where is Bay?

Bay sits at 14.2°N, 121.3°E, 11 m above sea level, in Philippines. The nearest listed city is Calauan, 5.0 km away.

Topography around Bay

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

Within 3 km, the terrain around Bay has only modest variations in elevation — a maximum elevation change of 22 m around an average of 6 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,088 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,141 m.

The land around Bay is covered by cropland (43%) and water (24%) within 3 km, trees (49%) and water (30%) within 16 km, and trees (44%) and water (43%) within 80 km.

3 km
22 m
16 km
1,088 m
80 km
2,141 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Calauan 5.0 km · Los Baños 5.0 km · Victoria 7.0 km · Pila 10 km · Del Remedio 11 km · Calamba 13 km · San Pablo 14 km · Alaminos 14 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 Bay (14.1837°, 121.2855°, elevation 11 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).