Vavuniya weather in September

In September, Vavuniya sees average daytime highs of 34°C and overnight lows near 25°C, with 72 mm of rain across 11.6 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 11% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Vavuniya's 6th-clearest and 4th-windiest month. For the whole year in context, see Vavuniya's year-round climate.

Daytime high
34°
6th warmest
Overnight low
25°
8th coldest
Rainfall
72 mm
11.6 wet days
Daylight
12 hours
6:01 AM – 6:04 PM
Cloud cover
74%
6th clearest
Wind
17 km/h
4th windiest
Solar energy
5.7 kWh/m²
Travel score
2.9
out of 10

Vavuniya is human settlement.

Density
2,674/km²
people per km²

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 34°C through the month.

A typical September day in Vavuniya reaches about 34°C in the afternoon and slips back to 25°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 36°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13426
23426
33426
43426
53426
63426
73426
83426
93426
103426
113426
123426
133426
143426
153426
163425
173425
183425
193425
203425
213425
223425
233425
243425
253425
263325
273325
283325
293325
303325

How September really feels in Vavuniya

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.

Vavuniya weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°6910.211.55.4
Feb31° / 22°457.511.75.0
Mar33° / 23°447.311.93.6
Apr34° / 25°10215.212.22.6
May34° / 26°7512.412.42.8
Jun34° / 26°297.212.53.0
Jul34° / 26°458.612.52.9
Aug34° / 26°5810.312.32.9
Sep34° / 25°7211.612.12.9
Oct32° / 24°18920.211.83.0
Nov30° / 23°23422.911.63.5
Dec29° / 23°16318.311.54.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 72%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12476
22476
32476
42476
52575
62674
72674
82674
92773
102773
112773
122971
133070
143070
153070
163070
173268
183169
193169
203169
213070
223070
232971
242971
252872
262872
272971
282971
292971
302971

Chance of precipitation in September

Any precipitation

Vavuniya gets around 72 mm of rain over 11.6 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 39% and peaks near 54% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
132
232
332
432
533
633
732
832
932
1032
1132
1233
1333
1434
1534
1635
1736
1838
1939
2040
2142
2244
2345
2447
2549
2650
2751
2853
2953
3054

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 91% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
14924
24924
34924
45914
55914
65914
75914
86904
96904
106904
115914
125914
135914
145914
154924
164924
174924
184924
193925
203925
213925
223916
233916
243907
254897
264888
274888
284879
294879
3048610

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2914light breeze
3014light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 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 18 minutes over September. Sunrise moves from 6:03 AM to 5:59 AM, and sunset from 6:13 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:036:13
212.26:036:12
312.26:026:12
412.16:026:11
512.16:026:10
612.16:026:10
712.16:026:09
812.16:026:09
912.16:026:08
1012.16:026:07
1112.16:026:07
1212.16:016:06
1312.16:016:06
1412.16:016:05
1512.16:016:04
1612.06:016:04
1712.06:016:03
1812.06:016:03
1912.06:016:02
2012.06:006:01
2112.06:006:01
2212.06:006:00
2312.06:005:59
2412.06:005:59
2512.06:005:58
2612.06:005:58
2712.06:005:57
2811.96:005:56
2911.95:595:56
3011.95:595:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.7 kWh/m².

For context, solar energy here swings from a low near 3.84 kWh/m² to a high of 6.24 kWh/m² in March across the year — September's 5.7 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.4Bright
Planning a trip in September

Hazard calendar for Vavuniya

In seasonPeak

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

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

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

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

Is September a good time to visit Vavuniya?

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

2.9
Sightseeing
8th-best month of the year
5.5
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Vavuniya.

What to pack for Vavuniya in September

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

In September, Vavuniya sees daytime highs around 34°C and nights near 25°C. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

Sea temperature near Vavuniya 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 58 km away) is warmest in April at about 31°C and coldest in January 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
Jan27Warm
Feb28Warm
Mar29Tropical
Apr31Tropical
May30Tropical
Jun29Tropical
Jul29Tropical
Aug28Tropical
Sep28Tropical
Oct29Tropical
Nov29Tropical
Dec27Warm

UV index in Vavuniya in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vavuniya peaks around May 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highMay 10UV 13Dec 22UV 9
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar12Extreme
Apr13Extreme
May14Extreme
Jun11Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec9Very high

Air quality in Vavuniya 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 Vavuniya is worst in May — around 24 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 1323 µg/m³Sep 1516 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb19Moderate
Mar21Moderate
Apr22Moderate
May24Moderate
Jun18Moderate
Jul17Moderate
Aug18Moderate
Sep16Moderate
Oct18Moderate
Nov18Moderate
Dec19Moderate
Location & terrain

Where is Vavuniya?

Vavuniya sits at 8.8°N, 80.5°E, 104 m above sea level, in Sri Lanka. The nearest listed city is Anuradhapura, 50 km away.

AnuradhapuraMullaittivuMannarTrincomaleeSigiriyaDambullaPolonnaruwaPuttalam

Topography around Vavuniya

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

Within 3 km, the terrain around Vavuniya has only modest variations in elevation — a maximum elevation change of 29 m around an average of 96 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 169 m; within 80 km, large variations in elevation — a maximum elevation change of 732 m.

The land around Vavuniya is covered by trees (58%) within 3 km, trees (64%) within 16 km, and trees (61%) within 80 km.

3 km
29 m
16 km
169 m
80 km
732 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Anuradhapura 50 km · Mullaittivu 67 km · Mannar 73 km · Trincomalee 83 km · Sigiriya 93 km · Dambulla 101 km · Polonnaruwa 106 km · Puttalam 108 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 Vavuniya (8.7514°, 80.4971°, elevation 104 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).