Boyolangu weather in January

In January, Boyolangu sees average daytime highs of 30°C and overnight lows near 23°C, with 349 mm of rain across 28.7 wet days and about 12.4 hours of daylight. It is the 6th-warmest and 1st-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 1% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of January to 12 h 24 min by month's end. Set against the rest of the year, January is Boyolangu's 10th-clearest and 9th-windiest month. For the whole year in context, see Boyolangu's year-round climate.

Daytime high
30°
6th warmest
Overnight low
23°
10th coldest
Rainfall
349 mm
28.7 wet days
Daylight
12 h 24 min
5:29 AM – 5:54 PM
Cloud cover
90%
10th clearest
Wind
4 km/h
9th windiest
Solar energy
4.48 kWh/m²
Travel score
2.6
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

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

A typical January day in Boyolangu reaches about 30°C in the afternoon and slips back to 23°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, January runs on par with December and on par with February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243023
253023
263023
273023
283023
293023
303023
313023

How January really feels in Boyolangu

Once humidity and wind are folded in, January 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 January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Boyolangu weather by month

How January compares with the rest of the year at a glance. January is the 6th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°34928.712.42.6
Feb30° / 23°33026.812.32.5
Mar30° / 23°28827.912.12.7
Apr30° / 23°18324.511.83.1
May30° / 22°8314.311.64.4
Jun30° / 22°508.711.55.3
Jul29° / 21°255.111.66.1
Aug29° / 20°122.511.76.4
Sep30° / 21°304.1125.7
Oct31° / 22°8413.212.24.3
Nov31° / 23°22123.812.43.0
Dec30° / 23°30627.112.52.7

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 6% of January, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1793
2793
3793
4892
5892
6892
7991
8991
9991
10991
11991
12991
13991
14892
15892
16892
17793
18793
19694
20694
21694
22595
23595
24397
25397
26397
27397
28397
29397
30397
31397

Chance of precipitation in January

Any precipitation

Boyolangu gets around 349 mm of rain over 28.7 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 92% and peaks near 98% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
189
289
390
490
590
690
790
889
989
1089
1189
1289
1390
1490
1590
1691
1791
1892
1992
2093
2194
2295
2395
2496
2596
2697
2797
2898
2998
3098
3198

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 96% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
11963
21963
31963
41963
51963
61963
71963
81963
90973
100973
110973
120973
130973
140973
150973
160964
170964
180964
190964
200964
210964
220964
230955
240955
250955
260955
270955
280955
290946
300946
310946

Wind in January

Winds average 4 km/h in January.

Across January, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
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
314calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 12 h 30 min at the start of January to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over January. Sunrise moves from 5:22 AM to 5:35 AM, and sunset from 5:50 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:225:50
212.55:225:50
312.55:235:50
412.55:235:51
512.55:245:51
612.55:245:51
712.55:255:52
812.55:255:52
912.45:265:52
1012.45:265:53
1112.45:275:53
1212.45:275:53
1312.45:285:54
1412.45:285:54
1512.45:285:54
1612.45:295:54
1712.45:295:55
1812.45:305:55
1912.45:305:55
2012.45:315:55
2112.45:315:55
2212.45:325:56
2312.45:325:56
2412.45:325:56
2512.45:335:56
2612.45:335:56
2712.45:345:56
2812.45:345:56
2912.45:345:56
3012.45:355:56
3112.45:355:56

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.48 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 5.77 kWh/m² in October across the year — January's 4.48 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
314.4Bright
Planning a trip in January

Hazard calendar for Boyolangu

In seasonPeak

In January, Boyolangu sits inside its cyclone and monsoon season. The full year is below, with each hazard's peak months called out.

Boyolangu sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Boyolangu's monsoon runs November–April, when most of the year's rain falls.

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

Is January a good time to visit Boyolangu?

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

2.6
Sightseeing
11th-best month of the year
3.7
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Boyolangu.

What to pack for Boyolangu in January

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

In January, Boyolangu sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

Sea temperature near Boyolangu in January

The nearest coast averages about 29°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 29 km away) is warmest in March at about 29°C and coldest in August near 25°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Tropical
Jun27Warm
Jul26Warm
Aug25Warm
Sep25Warm
Oct26Warm
Nov28Warm
Dec29Tropical

UV index in Boyolangu in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Boyolangu peaks around March 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 16 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 17UV 14Jun 16UV 8
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar14Extreme
Apr13Extreme
May10Very high
Jun7Very high
Jul10Very high
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov10Very high
Dec13Extreme

Air quality in Boyolangu 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 Boyolangu is worst in April — around 34 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 2133 µg/m³Sep 1723 µg/m³
PM2.5 (µg/m³)Level
Jan25Moderate
Feb25Moderate
Mar29Moderate
Apr34Moderate
May33Moderate
Jun31Moderate
Jul27Moderate
Aug24Moderate
Sep23Moderate
Oct24Moderate
Nov25Moderate
Dec23Moderate
Location & terrain

Where is Boyolangu?

Boyolangu sits at 8.1°S, 111.9°E, 94 m above sea level, in Indonesia. The nearest listed city is Tulungagung, 6.0 km away.

Topography around Boyolangu

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

Within 3 km, the terrain around Boyolangu has significant variations in elevation — a maximum elevation change of 340 m around an average of 96 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 678 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,838 m.

The land around Boyolangu is covered by cropland (52%), trees (25%) and artificial surfaces (21%) within 3 km, trees (53%) and cropland (29%) within 16 km, and trees (51%) and water (26%) within 80 km.

3 km
340 m
16 km
678 m
80 km
2,838 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Tulungagung 6.0 km · Kedungwaru 6.0 km · Ngunut 14 km · Trenggalek 21 km · Blitar 30 km · Kediri 36 km · Gampengrejo 42 km · Pare 51 km

Indonesia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,060
2025
Happiness
5.6 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
0.3
per 100k, 2022
Road deaths
11.3
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 471
Religion
Muslim 87%Protestant 8%Roman Catholic 3%Hindu 2%

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 Boyolangu (-8.1181°, 111.8935°, elevation 94 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).