Bay weather in January

In January, Bay sees average daytime highs of 27°C and overnight lows near 23°C, with 40 mm of rain across 4.6 wet days and about 11.3 hours of daylight. It is the 12th-warmest and 9th-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 27% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 11 h 12 min at the start of January to 11 h 24 min by month's end. Set against the rest of the year, January is Bay's 4th-clearest and 2nd-windiest month. For the whole year in context, see Bay's year-round climate.

Daytime high
27°
12th warmest
Overnight low
23°
2nd coldest
Rainfall
40 mm
4.6 wet days
Daylight
11 h 12 min
6:27 AM – 5:42 PM
Cloud cover
60%
4th clearest
Wind
13 km/h
2nd windiest
Solar energy
4.28 kWh/m²
Travel score
7.2
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 January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical January day in Bay reaches about 27°C in the afternoon and slips back to 23°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 28°C. Set against its neighbours, January runs on par with December and on par with February.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12724
22724
32723
42723
52723
62723
72723
82723
92723
102723
112723
122723
132723
142723
152723
162723
172723
182723
192723
202723
212723
222723
232723
242723
252723
262723
272723
282723
292723
302723
312723

How January really feels in Bay

Once humidity and wind are folded in, January 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

January 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 January compares with the rest of the year at a glance. January is the 12th-warmest and 9th-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 January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 27% of January, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24951
34951
45149
55050
65149
75149
85149
95149
105050
115149
125149
135149
145149
155149
165248
175248
185248
195347
205347
215446
225545
235644
245743
255743
265842
275941
285941
295941
305941
316040

Chance of precipitation in January

Any precipitation

Bay gets around 40 mm of rain over 4.6 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 16% and peaks near 22% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
122
221
320
419
518
617
716
816
915
1015
1115
1215
1315
1415
1515
1615
1715
1815
1915
2015
2115
2215
2315
2415
2515
2614
2714
2814
2914
3014
3114

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 71% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1123742
2123742
3124732
4124741
5125731
6125731
7126721
8126721
9127720
10127720
11128710
12128710
13128710
14128710
15128710
16128710
17128710
18128710
19128710
20129700
21129700
22129700
23129700
24129700
25129700
26130690
27130690
28131680
29131680
30132670
31132670

Wind in January

Winds average 13 km/h in January.

Across January, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light 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
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 12 min at the start of January to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over January. Sunrise moves from 6:23 AM to 6:27 AM, and sunset from 5:33 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.26:235:33
211.26:235:34
311.26:235:34
411.26:245:35
511.26:245:35
611.26:245:36
711.26:255:37
811.26:255:37
911.26:255:38
1011.26:265:38
1111.26:265:39
1211.26:265:39
1311.26:265:40
1411.26:265:40
1511.26:275:41
1611.26:275:42
1711.36:275:42
1811.36:275:43
1911.36:275:43
2011.36:275:44
2111.36:275:44
2211.36:275:45
2311.36:275:45
2411.36:275:46
2511.36:275:46
2611.36:275:47
2711.36:275:47
2811.36:275:48
2911.36:275:48
3011.46:275:49
3111.46:275:49

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.28 kWh/m².

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 — January's 4.28 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Bright
44.1Bright
54.1Bright
64.1Bright
74.1Bright
84.1Bright
94.1Bright
104.1Bright
114.1Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.5Bright
294.5Bright
304.5Bright
314.5Bright
Planning a trip in January

Hazard calendar for Bay

In seasonPeak

In January, 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 January a good time to visit Bay?

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

7.2
Sightseeing
2nd-best month of the year
7.3
Beach & pool
4th-best month of the year

January is one of the better times to visit Bay for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Bay in January

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

In January, Bay sees daytime highs around 27°C and nights near 23°C. Worth packing: light clothes. About 5 days see rain.

light clothes

Sea temperature near Bay in January

The nearest coast averages about 27°C in January — 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 January

LowModerateHighVery highExtreme

Clear-sky midday UV in January 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 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 January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January 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
January 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).