Dehiwala-Mount Lavinia weather in July

In July, Dehiwala-Mount Lavinia sees average daytime highs of 28°C and overnight lows near 26°C, with 205 mm of rain across 25.3 wet days and about 12.4 hours of daylight. It is the 10th-warmest and 6th-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 5% of the time in July, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of July to 12 h 18 min by month's end. Set against the rest of the year, July is Dehiwala-Mount Lavinia's 11th-clearest and 2nd-windiest month. For the whole year in context, see Dehiwala-Mount Lavinia's year-round climate.

Daytime high
28°
10th warmest
Overnight low
26°
9th coldest
Rainfall
205 mm
25.3 wet days
Daylight
12 h 24 min
6:05 AM – 6:27 PM
Cloud cover
83%
11th clearest
Wind
20 km/h
2nd windiest
Solar energy
4.93 kWh/m²
Travel score
3.7
out of 10

Dehiwala-Mount Lavinia is suburb of Colombo, Western Province, Sri Lanka.

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

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

A typical July day in Dehiwala-Mount Lavinia 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, July runs on par with June and on par with August.

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 July really feels in Dehiwala-Mount Lavinia

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

Dehiwala-Mount Lavinia weather by month

How July compares with the rest of the year at a glance. July is the 10th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 25°608.811.65.4
Feb30° / 25°578.511.85.2
Mar30° / 26°7514.9124.5
Apr30° / 26°17424.412.13.3
May29° / 27°2932912.33.0
Jun29° / 26°25726.512.43.3
Jul28° / 26°20525.312.43.7
Aug28° / 26°18324.612.23.8
Sep28° / 26°23224.3123.7
Oct28° / 25°3282611.83.6
Nov29° / 25°33023.811.73.7
Dec29° / 25°17516.711.64.6

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 9% of July, with mostly cloudy or overcast conditions the remaining 86%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11684
21585
31585
41486
51486
61486
71486
81387
91387
101387
111387
121288
131288
141288
151288
161288
171288
181288
191387
201387
211387
221387
231486
241486
251486
261585
271585
281684
291684
301783
311882

Chance of precipitation in July

Any precipitation

Dehiwala-Mount Lavinia gets around 205 mm of rain over 25.3 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 82% and peaks near 84% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
184
284
384
483
583
683
782
882
982
1082
1181
1281
1381
1481
1581
1681
1781
1881
1982
2082
2182
2281
2381
2481
2581
2681
2781
2881
2981
3081
3181

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the miserable band about 84% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
1892
2991
31090
41189
51288
61288
71387
81486
91486
101585
111684
121684
131783
141783
151783
161783
171783
181882
191882
201882
211882
221882
231882
241882
251882
261882
271783
281783
291783
301783
311783

Wind in July

Winds average 20 km/h in July.

Across July, daily wind ranges from about 20 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
120light breeze
220light breeze
320light breeze
420light breeze
520light breeze
620light breeze
720light breeze
820light breeze
920light breeze
1020light breeze
1120light breeze
1220light breeze
1320light breeze
1420light breeze
1520light breeze
1620light breeze
1720light breeze
1820light breeze
1920light breeze
2020light breeze
2120light breeze
2220light breeze
2320light breeze
2420light breeze
2520light breeze
2620light breeze
2720light breeze
2820light breeze
2920light breeze
3020light breeze
3120light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 12 h 24 min at the start of July 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 July. Sunrise moves from 6:02 AM to 6:07 AM, and sunset from 6:26 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:026:26
212.46:026:26
312.46:036:26
412.46:036:26
512.46:036:26
612.46:036:26
712.46:036:26
812.46:046:27
912.46:046:27
1012.46:046:27
1112.46:046:27
1212.46:046:27
1312.46:056:27
1412.46:056:27
1512.46:056:27
1612.46:056:27
1712.46:056:27
1812.46:066:27
1912.46:066:27
2012.36:066:27
2112.36:066:27
2212.36:066:27
2312.36:066:27
2412.36:076:27
2512.36:076:27
2612.36:076:27
2712.36:076:26
2812.36:076:26
2912.36:076:26
3012.36:076:26
3112.36:076:26

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.93 kWh/m².

For context, solar energy here swings from a low near 4.62 kWh/m² to a high of 6.26 kWh/m² in March across the year — July's 4.93 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in July

Hazard calendar for Dehiwala-Mount Lavinia

In seasonPeak

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

Dehiwala-Mount Lavinia 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 July a good time to visit Dehiwala-Mount Lavinia?

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

3.7
Sightseeing
6th-best month of the year
4.3
Beach & pool
9th-best month of the year

July is a weaker month for outdoor sightseeing in Dehiwala-Mount Lavinia.

What to pack for Dehiwala-Mount Lavinia in July

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

In July, Dehiwala-Mount Lavinia sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near Dehiwala-Mount Lavinia in July

The nearest coast averages about 28°C in July — 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 Dehiwala-Mount Lavinia in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Dehiwala-Mount Lavinia 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 Dehiwala-Mount Lavinia in July

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Dehiwala-Mount Lavinia is worst in February — around 37 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (September, 18 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateFeb 1437 µg/m³Sep 1118 µg/m³
PM2.5 (µg/m³)Level
Jan36Poor
Feb37Poor
Mar36Poor
Apr28Moderate
May24Moderate
Jun19Moderate
Jul18Moderate
Aug18Moderate
Sep18Moderate
Oct20Moderate
Nov30Moderate
Dec34Moderate
Location & terrain

Where is Dehiwala-Mount Lavinia?

Dehiwala-Mount Lavinia sits at 6.8°N, 79.9°E, 16 m above sea level, in Sri Lanka. The nearest listed city is Maharagama, 6.0 km away.

Topography around Dehiwala-Mount Lavinia

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Dehiwala-Mount Lavinia.

Within 3 km, the terrain around Dehiwala-Mount Lavinia has only modest variations in elevation — a maximum elevation change of 33 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 74 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,145 m.

The land around Dehiwala-Mount Lavinia is covered by artificial surfaces (51%) and water (32%) within 3 km, water (50%), trees (25%) and artificial surfaces (21%) within 16 km, and trees (59%) and water (37%) within 80 km.

3 km
33 m
16 km
74 m
80 km
2,145 m
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Maharagama 6.0 km · Sri Jayewardenepura Kotte 6.0 km · Pita Kotte 7.0 km · Moratuwa 8.0 km · Battaramulla South 8.0 km · Kolonnawa 10 km · Kotikawatta 11 km · Colombo 11 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 Dehiwala-Mount Lavinia (6.8402°, 79.8712°, elevation 16 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).