Sidareja weather in January

In January, Sidareja sees average daytime highs of 30°C and overnight lows near 24°C, with 332 mm of rain across 28.4 wet days and about 12.4 hours of daylight. It is the 4th-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 2% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of January to 12 h 18 min by month's end. Set against the rest of the year, January is Sidareja's 10th-clearest and 9th-windiest month. For the whole year in context, see Sidareja's year-round climate.

Daytime high
30°
4th warmest
Overnight low
24°
9th coldest
Rainfall
332 mm
28.4 wet days
Daylight
12 h 24 min
5:42 AM – 6:06 PM
Cloud cover
89%
10th clearest
Wind
5 km/h
9th windiest
Solar energy
4.59 kWh/m²
Travel score
2.8
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 Sidareja reaches about 30°C in the afternoon and slips back to 24°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°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)
12924
22924
32924
42924
52924
63024
73024
83024
93024
103024
113024
123024
133024
143024
153024
163024
173024
183024
193024
203024
213024
223024
233024
243024
253024
263024
273024
283024
293024
303024
313024

How January really feels in Sidareja

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.

Sidareja weather by month

How January compares with the rest of the year at a glance. January is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°33228.412.42.8
Feb30° / 24°3032712.22.7
Mar30° / 24°29428.412.12.8
Apr30° / 24°23026.111.83.0
May30° / 24°14820.611.73.9
Jun29° / 23°10316.211.64.8
Jul28° / 22°7112.711.65.9
Aug27° / 22°529.211.86.5
Sep28° / 23°8112.2125.7
Oct29° / 23°17419.212.24.3
Nov29° / 24°28925.912.33.2
Dec29° / 24°31928.312.42.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 4% of January, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1892
2892
3892
4793
5793
6793
7793
8793
9892
10892
11892
12892
13892
14793
15793
16694
17694
18694
19694
20595
21595
22595
23595
24496
25496
26397
27397
28397
29397
30397
31397

Chance of precipitation in January

Any precipitation

Sidareja gets around 332 mm of rain over 28.4 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 95% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
191
291
391
491
591
690
790
890
990
1090
1191
1291
1391
1491
1591
1692
1792
1892
1993
2093
2193
2293
2393
2494
2594
2694
2794
2894
2995
3095
3195

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 78% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
18020
28020
38020
48119
58119
68119
78020
88020
98020
108020
118020
128020
138020
148020
157921
167921
177822
187822
197723
207723
217624
227624
237525
247525
257525
267525
277426
287426
297525
307525
317525

Wind in January

Winds average 5 km/h in January.

Across January, daily wind ranges from about 5 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
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 12 h 24 min at the start of January to 12 h 18 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 5:35 AM to 5:48 AM, and sunset from 6:01 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:356:01
212.45:366:01
312.45:366:02
412.45:376:02
512.45:376:02
612.45:386:03
712.45:386:03
812.45:396:03
912.45:396:04
1012.45:406:04
1112.45:406:04
1212.45:416:05
1312.45:416:05
1412.45:416:05
1512.45:426:06
1612.45:426:06
1712.45:436:06
1812.45:436:06
1912.45:446:07
2012.45:446:07
2112.45:456:07
2212.45:456:07
2312.45:456:07
2412.45:466:07
2512.45:466:08
2612.45:476:08
2712.35:476:08
2812.35:476:08
2912.35:486:08
3012.35:486:08
3112.35:486:08

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.59 kWh/m².

For context, solar energy here swings from a low near 4.37 kWh/m² to a high of 5.16 kWh/m² in September across the year — January's 4.59 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
314.5Bright
Planning a trip in January

Hazard calendar for Sidareja

In seasonPeak

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

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

Sidareja's rainy season runs October–April, when most of the year's rain falls.

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

Is January a good time to visit Sidareja?

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

2.8
Sightseeing
10th-best month of the year
3.8
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Sidareja.

What to pack for Sidareja in January

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

In January, Sidareja sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

Sea temperature near Sidareja 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 44 km away) is warmest in April at about 29°C and coldest in August near 26°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun28Warm
Jul27Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec29Tropical

UV index in Sidareja 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 Sidareja peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeExtremeMar 12UV 15Jun 15UV 7
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May9Very high
Jun7High
Jul10Very high
Aug11Extreme
Sep12Extreme
Oct13Extreme
Nov9Very high
Dec12Extreme

Air quality in Sidareja 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 Sidareja is worst in May — around 46 µg/m³ PM2.5 (poor), and holds fairly steady the rest of the year.

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateMay 1545 µg/m³Sep 1630 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb39Poor
Mar41Poor
Apr44Poor
May46Poor
Jun43Poor
Jul37Poor
Aug31Moderate
Sep30Moderate
Oct31Moderate
Nov32Moderate
Dec33Moderate
Location & terrain

Where is Sidareja?

Sidareja sits at 7.5°S, 108.8°E, 8 m above sea level, in Indonesia. The nearest listed city is Majenang, 21 km away.

Topography around Sidareja

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

Within 3 km, the terrain around Sidareja has only modest variations in elevation — a maximum elevation change of 77 m around an average of 8 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 437 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,396 m.

The land around Sidareja is covered by cropland (46%) and trees (37%) within 3 km, trees (51%) and cropland (42%) within 16 km, and trees (53%) and water (26%) within 80 km.

3 km
77 m
16 km
437 m
80 km
3,396 m
treesgrasslandcroplandartificial surfaceswaterwetland
January weather nearby: Majenang 21 km · Wangon 29 km · Cilacap 36 km · Purwokerto 49 km · Margasari 50 km · Baturaden 51 km · Ciamis 52 km · Kroya 53 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 Sidareja (-7.4846°, 108.7923°, elevation 8 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).