Battaramulla South weather in January

In January, Battaramulla South sees average daytime highs of 31°C and overnight lows near 23°C, with 66 mm of rain across 8.4 wet days and about 11.6 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 30% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 11 h 36 min at the start of January to 11 h 42 min by month's end. Set against the rest of the year, January is Battaramulla South's 3rd-clearest and 6th-windiest month. For the whole year in context, see Battaramulla South's year-round climate.

Daytime high
31°
4th warmest
Overnight low
23°
1st coldest
Rainfall
66 mm
8.4 wet days
Daylight
11 h 36 min
6:30 AM – 6:09 PM
Cloud cover
59%
3rd clearest
Wind
10 km/h
6th windiest
Solar energy
5.3 kWh/m²
Travel score
4.4
out of 10

Battaramulla South is suburb of the city of Colombo, Sri Lanka.

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 31°C through the month.

A typical January day in Battaramulla South reaches about 31°C in the afternoon and slips back to 23°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, January runs about 1°C warmer than December and about 1°C cooler than February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183223
193223
203223
213223
223223
233223
243223
253223
263223
273223
283223
293223
303223
313223

How January really feels in Battaramulla South

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.

Battaramulla South weather by month

How January compares with the rest of the year at a glance. January is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°668.411.64.4
Feb33° / 24°658.611.83.8
Mar33° / 25°9414.8123.1
Apr32° / 25°19225.412.12.5
May31° / 26°26429.412.32.5
Jun30° / 25°27928.712.42.7
Jul29° / 25°24529.212.42.9
Aug29° / 25°21929.112.22.9
Sep29° / 25°24727.8122.9
Oct30° / 24°35928.211.82.9
Nov30° / 24°33723.911.73.2
Dec30° / 23°17816.111.64.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 18% of January, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24852
34951
44951
54951
64951
74951
85050
94951
104951
114951
124951
134951
144951
154951
164951
174951
184852
194852
204951
214852
224852
234852
244852
254951
264951
274951
284951
294951
305149
315149

Chance of precipitation in January

Any precipitation

Battaramulla South gets around 66 mm of rain over 8.4 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 28% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
234
334
433
533
633
732
832
931
1030
1130
1229
1328
1427
1527
1626
1725
1825
1924
2024
2124
2223
2323
2424
2524
2624
2725
2825
2926
3027
3127

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 54% of days. Sticky, muggy-or-worse air turns up on roughly 91% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10529615
20629605
30629614
40629614
50729604
60729604
70730603
80830593
90830593
100830593
110831583
120932563
130932563
140933553
150934543
160935533
1701036513
1801036522
1901037512
2001038492
2111039482
2211139482
2311139472
2411140472
2511140472
2611039482
2711039482
2811039492
2911038492
3011037502
3111037502

Wind in January

Winds average 10 km/h in January.

Across January, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 36 min at the start of January to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over January. Sunrise moves from 6:25 AM to 6:33 AM, and sunset from 6:02 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:256:02
211.66:266:02
311.66:266:03
411.66:276:03
511.66:276:04
611.66:276:04
711.66:286:05
811.66:286:05
911.66:286:06
1011.66:296:06
1111.66:296:07
1211.66:296:07
1311.66:306:07
1411.66:306:08
1511.66:306:08
1611.66:306:09
1711.66:316:09
1811.66:316:10
1911.66:316:10
2011.76:316:11
2111.76:326:11
2211.76:326:11
2311.76:326:12
2411.76:326:12
2511.76:326:13
2611.76:326:13
2711.76:326:13
2811.76:336:14
2911.76:336:14
3011.76:336:14
3111.76:336:15

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.3 kWh/m².

For context, solar energy here swings from a low near 4.43 kWh/m² to a high of 6.15 kWh/m² in March across the year — January's 5.3 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.9Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.1Bright
85.1Bright
95.1Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.6Bright
295.6Bright
305.6Bright
315.6Bright
Planning a trip in January

Hazard calendar for Battaramulla South

In seasonPeak

None of Battaramulla South's seasonal hazards are active in January. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Battaramulla South sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

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

Is January a good time to visit Battaramulla South?

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

4.4
Sightseeing
1st-best month of the year
6.7
Beach & pool
1st-best month of the year

January is a reasonable time to visit Battaramulla South for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Battaramulla South in January

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

In January, Battaramulla South sees daytime highs around 31°C and nights near 23°C. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Battaramulla South in January

The nearest coast averages about 28°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in April at about 30°C and coldest in August 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
Jan28Warm
Feb28Tropical
Mar29Tropical
Apr30Tropical
May29Tropical
Jun28Tropical
Jul28Warm
Aug27Warm
Sep28Warm
Oct28Tropical
Nov29Tropical
Dec28Tropical

UV index in Battaramulla South 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 Battaramulla South peaks around September 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highSep 10UV 13Dec 15UV 10
UV index (midday)Level
Jan10Extreme
Feb12Extreme
Mar12Extreme
Apr12Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov10Extreme
Dec10Very high

Air quality in Battaramulla South 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 Battaramulla South is worst in January — around 84 µg/m³ PM2.5 (unhealthy), about 2.8× the cleanest month (July, 29 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyJan 1483 µg/m³Jul 2129 µg/m³
PM2.5 (µg/m³)Level
Jan84Unhealthy
Feb78Unhealthy
Mar73Unhealthy
Apr62Unhealthy
May44Poor
Jun31Moderate
Jul29Moderate
Aug30Moderate
Sep35Poor
Oct52Poor
Nov74Unhealthy
Dec81Unhealthy
Location & terrain

Where is Battaramulla South?

Battaramulla South sits at 6.9°N, 79.9°E, 11 m above sea level, in Sri Lanka. The nearest listed city is Sri Jayewardenepura Kotte, 2.0 km away.

Topography around Battaramulla South

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

Within 3 km, the terrain around Battaramulla South has only modest variations in elevation — a maximum elevation change of 41 m around an average of 11 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 135 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,145 m.

The land around Battaramulla South is covered by artificial surfaces (53%) and trees (36%) within 3 km, trees (42%), water (27%) and artificial surfaces (25%) within 16 km, and trees (62%) and water (34%) within 80 km.

3 km
41 m
16 km
135 m
80 km
2,145 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Sri Jayewardenepura Kotte 2.0 km · Pita Kotte 2.0 km · Kotikawatta 4.0 km · Mulleriyawa 4.0 km · Maharagama 5.0 km · Kolonnawa 5.0 km · Kelaniya 7.0 km · Dehiwala-Mount Lavinia 8.0 km

Sri Lanka travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 27% of US
price level, 2025
GDP per capita
$5,002
2025
Happiness
4.0 / 10
World Happiness, 2025
Safe drinking water
47%
of population, 2024
Homicide rate
3.3
per 100k, 2019
Road deaths
19.7
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 486
Religion
Buddhist 70%Hindu 13%Muslim 10%Roman Catholic 6%

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 Battaramulla South (6.8964°, 79.9181°, 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).