Butwāl weather in September

In September, Butwāl sees average daytime highs of 29°C and overnight lows near 23°C, with 280 mm of rain across 26.4 wet days and about 12.2 hours of daylight. It is the 6th-warmest and 4th-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 20% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Butwāl's 10th-clearest and 11th-windiest month. For the whole year in context, see Butwāl's year-round climate.

Daytime high
29°
6th warmest
Overnight low
23°
9th coldest
Rainfall
280 mm
26.4 wet days
Daylight
12 h 12 min
6:01 AM – 6:10 PM
Cloud cover
65%
10th clearest
Wind
4 km/h
11th windiest
Solar energy
4.15 kWh/m²
Travel score
3.5
out of 10

Butwāl is city in Rupandehi District, Nepal.

Density
1,920/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 29°C through the month.

A typical September day in Butwāl reaches about 29°C in the afternoon and slips back to 23°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12923
22923
32923
42923
52923
62923
72923
82923
92923
102923
112923
122923
132923
142923
152923
162923
172923
182922
192922
202922
212922
222922
232922
242922
252922
262922
272922
282922
292921
302821

How September really feels in Butwāl

Once humidity and wind are folded in, September averages 19 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
19
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.

Butwāl weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 213.110.47.4
Feb22° / 10°234.2117.9
Mar27° / 14°204.611.87.4
Apr32° / 18°418.512.64.6
May32° / 21°12718.313.43.5
Jun31° / 23°37525.313.73.0
Jul29° / 24°57430.713.62.7
Aug29° / 24°51629.9132.8
Sep29° / 23°28026.412.23.5
Oct27° / 18°5811.411.36.6
Nov24° / 13°91.410.68.8
Dec20° / 101.110.38.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 24% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12080
22179
32476
42575
52674
62773
72971
82971
93268
103466
113565
123664
133763
143961
154060
164258
174357
184654
194753
204951
215149
225446
235644
245941
256139
266436
276634
286931
297129
307426

Chance of precipitation in September

Any precipitation

Butwāl gets around 280 mm of rain over 26.4 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 87% and peaks near 95% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
195
295
395
495
594
694
794
893
992
1092
1191
1290
1389
1489
1588
1687
1787
1886
1985
2085
2184
2283
2382
2481
2580
2679
2778
2876
2975
3073

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 84% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1007030
2007228
3007327
4007525
5007723
6007921
7008020
8008218
9008416
10008515
11008713
12008812
13018811
14018910
1501909
1601918
1701927
1802926
1902935
2003934
2104924
2205923
2306913
2408893
25010882
26112852
27114832
28117811
29119791
30122761

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over September. Sunrise moves from 5:54 AM to 6:07 AM, and sunset from 6:28 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:546:28
212.65:546:27
312.55:556:26
412.55:556:25
512.55:556:24
612.45:566:22
712.45:566:21
812.45:576:20
912.45:576:19
1012.35:586:18
1112.35:586:16
1212.35:596:15
1312.25:596:14
1412.26:006:13
1512.26:006:12
1612.26:016:10
1712.16:016:09
1812.16:026:08
1912.16:026:07
2012.06:036:06
2112.06:036:04
2212.06:046:03
2312.06:046:02
2411.96:046:01
2511.96:055:59
2611.96:055:58
2711.96:065:57
2811.86:065:56
2911.86:075:55
3011.86:075:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 3.56 kWh/m² to a high of 6.48 kWh/m² in April across the year — September's 4.15 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.1Bright
44.1Bright
54.1Bright
64.1Bright
74.1Bright
84.1Bright
94.1Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.4Bright
Planning a trip in September

Hazard calendar for Butwāl

In seasonPeak

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

Butwāl's monsoon runs June–September, when most of the year's rain falls.

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

Is September a good time to visit Butwāl?

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

3.5
Sightseeing
8th-best month of the year
4.4
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Butwāl.

What to pack for Butwāl in September

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

In September, Butwāl sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. About 26 days see rain.

light clothesrain gear

UV index in Butwāl in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Butwāl peaks around July 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highModerateJul 22UV 10Nov 22UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar8Very high
Apr8Very high
May9Very high
Jun8Very high
Jul11Extreme
Aug10Extreme
Sep9Very high
Oct6High
Nov4Moderate
Dec4Moderate

Air quality in Butwāl 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 Butwāl is worst in January — around 166 µg/m³ PM2.5 (very unhealthy), about 4.5× the cleanest month (July, 37 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecVery unhealthyUnhealthyPoorUnhealthyVery unhealthyJan 12164 µg/m³Jul 2139 µg/m³
PM2.5 (µg/m³)Level
Jan166Very unhealthy
Feb138Unhealthy
Mar104Unhealthy
Apr90Unhealthy
May69Unhealthy
Jun63Unhealthy
Jul37Poor
Aug44Poor
Sep54Poor
Oct95Unhealthy
Nov140Unhealthy
Dec158Very unhealthy
Location & terrain

Where is Butwāl?

Butwāl sits at 27.7°N, 83.5°E, 141 m above sea level, in Nepal. The nearest listed city is Siddharthanagar, 21 km away.

BāgluṅPokharaChitwanTulsi̇̄pur

Topography around Butwāl

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

Within 3 km, the terrain around Butwāl has large variations in elevation — a maximum elevation change of 622 m around an average of 224 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,787 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,420 m.

The land around Butwāl is covered by trees (49%) and artificial surfaces (37%) within 3 km, trees (60%) and cropland (30%) within 16 km, and trees (59%) and cropland (36%) within 80 km.

3 km
622 m
16 km
1,787 m
80 km
3,420 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Siddharthanagar 21 km · Tānsen 22 km · Lumbini 33 km · Wāliṅ 44 km · Bāgluṅ 66 km · Pokhara 82 km · Chitwan 97 km · Tulsi̇̄pur 124 km

Nepal travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / D / M
230 V · 50 Hz
Prices
≈ 24% of US
price level, 2025
GDP per capita
$1,536
2025
Happiness
5.1 / 10
World Happiness, 2025
Safe drinking water
16%
of population, 2024
Homicide rate
2.1
per 100k, 2020
Road deaths
16.3
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Moderate
EF EPI 514
Religion
Hindu 81%Buddhist 8%Muslim 5%Kirat 3%

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 Butwāl (27.6912°, 83.4525°, elevation 141 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. 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).