Chitwan weather in September

In September, Chitwan sees average daytime highs of 30°C and overnight lows near 23°C, with 306 mm of rain across 25.5 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 30°C through the month. The sky is clear or mostly clear about 21% 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 Chitwan's 10th-clearest and 10th-windiest month. For the whole year in context, see Chitwan's year-round climate.

Daytime high
30°
6th warmest
Overnight low
23°
9th coldest
Rainfall
306 mm
25.5 wet days
Daylight
12 h 12 min
5:57 AM – 6:06 PM
Cloud cover
67%
10th clearest
Wind
3 km/h
10th windiest
Solar energy
3.94 kWh/m²
Travel score
3.3
out of 10

Chitwan is metropolitan city in Chitwan District, Nepal.

Density
853/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 30°C through the month.

A typical September day in Chitwan reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13024
23024
33024
43024
53024
63024
73024
83024
93024
103024
113024
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243022
252922
262922
272922
282922
292922
302922

How September really feels in Chitwan

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.

Chitwan 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
Jan20° / 274.210.47.6
Feb23° / 10°324.6118.0
Mar28° / 14°265.511.87.1
Apr31° / 17°53912.64.7
May32° / 21°16719.513.43.5
Jun31° / 24°43926.113.72.8
Jul30° / 24°68330.513.62.6
Aug30° / 24°55530.2132.6
Sep30° / 23°30625.512.23.3
Oct28° / 19°569.611.36.4
Nov25° / 13°121.410.68.8
Dec22° / 10°121.210.38.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11783
21882
32179
42278
52476
62476
72674
82971
92971
103169
113367
123466
133664
143862
153862
164060
174258
184456
194555
204753
214951
225248
235446
245644
255842
266139
276436
286634
296931
307030

Chance of precipitation in September

Any precipitation

Chitwan gets around 306 mm of rain over 25.5 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 84% and peaks near 94% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
194
294
394
493
593
693
792
891
991
1090
1189
1288
1388
1487
1586
1686
1785
1884
1983
2082
2181
2279
2378
2476
2575
2673
2771
2869
2967
3065

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 81% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1005941
2006139
3006337
4006535
5006832
6007030
7007327
8007525
9007723
10008020
11008218
12008317
13018415
14018514
15018712
16018811
17018910
1802899
1902908
2003907
2103916
2204915
2305905
2406904
2508884
26010873
27112843
28114832
29117802
30120781

Wind in September

Winds average 3 km/h in September.

Across September, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm

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 5:50 AM to 6:04 AM, and sunset from 6:24 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:506:24
212.65:506:23
312.55:516:22
412.55:516:21
512.55:526:20
612.45:526:18
712.45:526:17
812.45:536:16
912.45:536:15
1012.35:546:14
1112.35:546:13
1212.35:556:11
1312.25:556:10
1412.25:566:09
1512.25:566:08
1612.25:576:06
1712.15:576:05
1812.15:586:04
1912.15:586:03
2012.05:596:02
2112.05:596:00
2212.06:005:59
2312.06:005:58
2411.96:015:57
2511.96:015:56
2611.96:025:54
2711.96:025:53
2811.86:035:52
2911.86:035:51
3011.86:045:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.94 kWh/m².

For context, solar energy here swings from a low near 3.48 kWh/m² to a high of 6.31 kWh/m² in April across the year — September's 3.94 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.8Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.9Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
184.0Moderate
194.0Moderate
204.0Moderate
214.0Moderate
224.0Bright
234.0Bright
244.0Bright
254.1Bright
264.1Bright
274.1Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Chitwan

In seasonPeak

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

Chitwan's monsoon runs June–August, 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 Chitwan?

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

3.3
Sightseeing
9th-best month of the year
4.5
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Chitwan.

What to pack for Chitwan in September

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

In September, Chitwan sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. About 26 days see rain.

light clothesrain gear

UV index in Chitwan 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 Chitwan peaks around July 21 at about 11 (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 21UV 11Nov 22UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar8Very high
Apr8Very high
May8Very high
Jun8Very high
Jul11Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec4Moderate

Air quality in Chitwan 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 Chitwan is worst in January — around 141 µg/m³ PM2.5 (unhealthy), about 4.8× the cleanest month (July, 30 µg/m³).

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

0306090120150JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyJan 14139 µg/m³Jul 2131 µg/m³
PM2.5 (µg/m³)Level
Jan141Unhealthy
Feb123Unhealthy
Mar106Unhealthy
Apr88Unhealthy
May61Unhealthy
Jun53Poor
Jul30Moderate
Aug36Poor
Sep44Poor
Oct73Unhealthy
Nov104Unhealthy
Dec132Unhealthy
Location & terrain

Where is Chitwan?

Chitwan sits at 27.7°N, 84.4°E, 206 m above sea level, in Nepal. The nearest listed city is Hetauda, 65 km away.

HetaudaWāliṅPokharaKi̇̄rtipurBirgañjPatanKathmanduTānsen

Topography around Chitwan

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

Within 3 km, the terrain around Chitwan has only modest variations in elevation — a maximum elevation change of 58 m around an average of 205 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,438 m; within 80 km, extreme variations in elevation — a maximum elevation change of 6,539 m.

The land around Chitwan is covered by artificial surfaces (43%), trees (30%) and cropland (22%) within 3 km, trees (63%) and cropland (28%) within 16 km, and trees (71%) and cropland (23%) within 80 km.

3 km
58 m
16 km
1,438 m
80 km
6,539 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hetauda 65 km · Wāliṅ 75 km · Pokhara 80 km · Ki̇̄rtipur 83 km · Birgañj 86 km · Patan 86 km · Kathmandu 87 km · Tānsen 90 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 Chitwan (27.6803°, 84.4365°, elevation 206 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).