Chilaw weather in August

In August, Chilaw sees average daytime highs of 28°C and overnight lows near 26°C, with 129 mm of rain across 21.9 wet days and about 12.2 hours of daylight. It is the 12th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 7% of the time in August, and the air most often feels miserable.

Daylight stretches from about 12 h 18 min at the start of August to 12 h 12 min by month's end. Set against the rest of the year, August is Chilaw's 10th-clearest and 3rd-windiest month. For the whole year in context, see Chilaw's year-round climate.

Daytime high
28°
12th warmest
Overnight low
26°
8th coldest
Rainfall
129 mm
21.9 wet days
Daylight
12 h 18 min
6:07 AM – 6:22 PM
Cloud cover
78%
10th clearest
Wind
22 km/h
3rd windiest
Solar energy
5.51 kWh/m²
Travel score
4.1
out of 10

Chilaw is large town in Puttalam district, Sri Lanka.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical August day in Chilaw reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, August runs on par with July and on par with September.

24°26°28°30°32°151015202531
Avg high (°C)Avg low (°C)
12826
22826
32826
42826
52826
62826
72826
82826
92826
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826
312826

How August really feels in Chilaw

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

Chilaw weather by month

How August compares with the rest of the year at a glance. August 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
Jan30° / 24°376.111.65.7
Feb31° / 25°33611.85.2
Mar31° / 26°6913.711.94.4
Apr30° / 26°15224.912.23.2
May30° / 27°22128.112.33.0
Jun29° / 27°18525.812.43.4
Jul28° / 26°13322.112.44.0
Aug28° / 26°12921.912.24.1
Sep28° / 26°18024.4123.7
Oct29° / 26°29826.111.83.5
Nov29° / 25°26122.211.73.8
Dec29° / 25°13113.511.65.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 12% of August, with mostly cloudy or overcast conditions the remaining 81%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11981
21981
32080
42080
51981
61882
71882
81882
91882
101882
111882
121882
131882
141882
151882
161882
171882
182080
192080
202080
212080
222080
232080
242080
252080
262080
272080
281981
291981
301981
311981

Chance of precipitation in August

Any precipitation

Chilaw gets around 129 mm of rain over 21.9 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 71% and peaks near 77% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
169
269
368
468
568
668
768
868
968
1069
1169
1269
1369
1469
1570
1670
1771
1871
1971
2072
2172
2272
2373
2473
2574
2674
2775
2875
2976
3076
3177

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the miserable band about 89% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
11189
21189
31189
41189
51189
61090
71090
81090
91090
101090
111090
12991
13991
14991
15991
16991
17991
18991
191090
201090
211189
221189
231189
241288
251288
261288
271387
281387
291387
301486
311486

Wind in August

Winds average 22 km/h in August.

Across August, daily wind ranges from about 21 km/h on the calmest days to 22 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
122breezy
222breezy
322breezy
422breezy
522breezy
622breezy
722breezy
822breezy
922breezy
1022breezy
1122breezy
1222breezy
1322breezy
1421breezy
1521breezy
1621breezy
1721breezy
1821breezy
1921breezy
2021breezy
2121breezy
2221breezy
2321breezy
2421breezy
2521breezy
2621breezy
2721breezy
2821breezy
2921breezy
3021breezy
3121breezy

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 18 min at the start of August to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over August. Sunrise moves from 6:07 AM to 6:06 AM, and sunset from 6:27 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:076:27
212.36:076:27
312.36:076:26
412.36:076:26
512.36:076:26
612.36:076:26
712.36:076:25
812.36:076:25
912.36:076:25
1012.36:076:25
1112.36:076:24
1212.36:076:24
1312.36:076:24
1412.36:076:23
1512.36:076:23
1612.36:076:22
1712.26:076:22
1812.26:076:22
1912.26:076:21
2012.26:076:21
2112.26:076:20
2212.26:076:20
2312.26:076:19
2412.26:076:19
2512.26:076:18
2612.26:076:18
2712.26:076:18
2812.26:076:17
2912.26:066:16
3012.26:066:16
3112.26:066:15

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.51 kWh/m².

For context, solar energy here swings from a low near 4.7 kWh/m² to a high of 6.51 kWh/m² in March across the year — August's 5.51 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in August

Hazard calendar for Chilaw

In seasonPeak

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

Chilaw 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 August a good time to visit Chilaw?

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

4.1
Sightseeing
5th-best month of the year
4.8
Beach & pool
6th-best month of the year

August is a reasonable time to visit Chilaw for sightseeing.

What to pack for Chilaw in August

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

In August, Chilaw sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection and a windbreaker. About 22 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Chilaw in August

The nearest coast averages about 27°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 20 km away) 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
Feb28Warm
Mar29Tropical
Apr30Tropical
May29Tropical
Jun28Tropical
Jul27Warm
Aug27Warm
Sep28Warm
Oct28Tropical
Nov29Tropical
Dec28Tropical

UV index in Chilaw in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chilaw peaks around April 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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 highApr 18UV 13Dec 19UV 9
UV index (midday)Level
Jan10Very high
Feb13Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun11Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov10Extreme
Dec9Very high

Air quality in Chilaw in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Chilaw is worst in March — around 30 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (August, 17 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2030 µg/m³Aug 2417 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb23Moderate
Mar30Moderate
Apr28Moderate
May24Moderate
Jun18Moderate
Jul17Moderate
Aug17Moderate
Sep17Moderate
Oct19Moderate
Nov24Moderate
Dec23Moderate
Location & terrain

Where is Chilaw?

Chilaw sits at 7.6°N, 79.8°E, 8 m above sea level, in Sri Lanka. The nearest listed city is Negombo, 41 km away.

NegomboKatunayakaPuttalamJa ElaKandanaWelisaraKurunegalaHendala

Topography around Chilaw

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

Within 3 km, the terrain around Chilaw has only modest variations in elevation — a maximum elevation change of 15 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 67 m; within 80 km, large variations in elevation — a maximum elevation change of 977 m.

The land around Chilaw is covered by water (38%) and trees (33%) within 3 km, water (52%) and trees (39%) within 16 km, and trees (53%) and water (37%) within 80 km.

3 km
15 m
16 km
67 m
80 km
977 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
August weather nearby: Negombo 41 km · Katunayaka 46 km · Puttalam 51 km · Ja Ela 57 km · Kandana 60 km · Welisara 62 km · Kurunegala 64 km · Hendala 66 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 Chilaw (7.5758°, 79.7953°, 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).