Homagama weather in September

In September, Homagama sees average daytime highs of 29°C and overnight lows near 25°C, with 258 mm of rain across 28 wet days and about 12 hours of daylight. It is the 10th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 3% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 06 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Homagama's 7th-clearest and 4th-windiest month. For the whole year in context, see Homagama's year-round climate.

Daytime high
29°
10th warmest
Overnight low
25°
7th coldest
Rainfall
258 mm
28 wet days
Daylight
12 hours
6:03 AM – 6:05 PM
Cloud cover
82%
7th clearest
Wind
9 km/h
4th windiest
Solar energy
4.75 kWh/m²
Travel score
3.0
out of 10

Homagama is suburb in Colombo District, Western Province, Sri Lanka.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical September day in Homagama reaches about 29°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 30°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192925
202925
212925
222925
232925
242925
252925
262925
272925
282924
292924
302924

How September really feels in Homagama

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Homagama weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°9411.111.64.4
Feb32° / 24°8510.711.84.1
Mar32° / 24°10516.9123.4
Apr32° / 25°20826.612.12.6
May30° / 25°28929.912.32.6
Jun29° / 25°28329.112.42.8
Jul29° / 25°24329.312.42.9
Aug29° / 25°22429.312.23.0
Sep29° / 25°25828123.0
Oct29° / 24°35728.111.83.0
Nov30° / 24°36824.611.73.2
Dec30° / 23°21419.211.63.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 87%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11189
21189
31288
41387
51387
61387
71387
81387
91387
101486
111486
121486
131486
141486
151486
161486
171486
181486
191486
201387
211387
221387
231387
241387
251387
261387
271387
281387
291486
301486

Chance of precipitation in September

Any precipitation

Homagama gets around 258 mm of rain over 28 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 93% and peaks near 94% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
193
293
393
493
593
693
793
893
993
1093
1193
1293
1393
1493
1593
1693
1793
1893
1993
2094
2194
2293
2393
2493
2593
2693
2793
2892
2992
3092

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
12575
22674
32674
42773
52773
62773
72773
82674
92674
102674
112674
122674
132575
142575
152575
162476
172476
182476
192575
202575
212674
222674
232773
242773
252872
262872
272971
282971
293070
303070

Wind in September

Winds average 9 km/h in September.

Across September, 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.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over September. Sunrise moves from 6:06 AM to 6:01 AM, and sunset from 6:14 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:066:14
212.16:066:13
312.16:056:13
412.16:056:12
512.16:056:12
612.16:056:11
712.16:056:10
812.16:056:10
912.16:046:09
1012.16:046:09
1112.16:046:08
1212.16:046:08
1312.16:046:07
1412.06:046:07
1512.06:036:06
1612.06:036:05
1712.06:036:05
1812.06:036:04
1912.06:036:04
2012.06:026:03
2112.06:026:03
2212.06:026:02
2312.06:026:01
2412.06:026:01
2512.06:026:00
2612.06:016:00
2712.06:015:59
2812.06:015:59
2912.06:015:58
3011.96:015:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.75 kWh/m².

For context, solar energy here swings from a low near 4.41 kWh/m² to a high of 6.06 kWh/m² in March across the year — September's 4.75 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Homagama

In seasonPeak

In September, Homagama sits inside its cyclone season. The full year is below, with each hazard's peak months called out.

Homagama 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 September a good time to visit Homagama?

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

3.0
Sightseeing
6th-best month of the year
3.9
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Homagama.

What to pack for Homagama in September

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

In September, Homagama sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

Sea temperature near Homagama in September

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

The sea at the nearest coast (about 14 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
Feb28Tropical
Mar29Tropical
Apr30Tropical
May29Tropical
Jun28Tropical
Jul28Warm
Aug27Warm
Sep28Warm
Oct28Tropical
Nov29Tropical
Dec28Tropical

UV index in Homagama in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Homagama 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 Homagama in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Homagama 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 Homagama?

Homagama sits at 6.8°N, 80.0°E, 37 m above sea level, in Sri Lanka. The nearest listed city is Maharagama, 8.0 km away.

Topography around Homagama

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

Within 3 km, the terrain around Homagama has only modest variations in elevation — a maximum elevation change of 62 m around an average of 25 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 218 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,182 m.

The land around Homagama is covered by trees (73%) within 3 km, trees (73%) within 16 km, and trees (65%) and water (31%) within 80 km.

3 km
62 m
16 km
218 m
80 km
2,182 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Maharagama 8.0 km · Battaramulla South 11 km · Hanwella Ihala 11 km · Sri Jayewardenepura Kotte 11 km · Pita Kotte 12 km · Mulleriyawa 13 km · Kotikawatta 14 km · Dehiwala-Mount Lavinia 14 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 Homagama (6.844°, 80.0024°, elevation 37 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).