Īṭahari̇̄ weather in September

In September, Īṭahari̇̄ sees average daytime highs of 29°C and overnight lows near 23°C, with 277 mm of rain across 24.7 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 18% 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 Īṭahari̇̄'s 9th-clearest and 7th-windiest month. For the whole year in context, see Īṭahari̇̄'s year-round climate.

Daytime high
29°
6th warmest
Overnight low
23°
9th coldest
Rainfall
277 mm
24.7 wet days
Daylight
12 h 12 min
5:46 AM – 5:55 PM
Cloud cover
70%
9th clearest
Wind
5 km/h
7th windiest
Solar energy
3.85 kWh/m²
Travel score
3.5
out of 10

Īṭahari̇̄ is city in Sunsari District, Nepal.

Density
512/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 Īṭahari̇̄ 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 1°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52924
62924
72924
82924
92924
102924
112924
122924
132924
142924
152924
162924
172923
182923
192923
202923
212923
222923
232923
242923
252923
262923
272923
282923
292922
302922

How September really feels in Īṭahari̇̄

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.

Īṭahari̇̄ 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
Jan21° / 10°10210.58.2
Feb24° / 12°132.411.18.5
Mar29° / 16°153.411.87.0
Apr32° / 20°448.412.64.4
May31° / 23°12718.413.33.6
Jun30° / 24°31826.513.62.9
Jul30° / 25°48029.813.52.7
Aug30° / 25°37129.812.92.7
Sep29° / 23°27724.712.23.5
Oct28° / 20°738.111.46.6
Nov26° / 15°71.110.78.9
Dec22° / 11°50.910.48.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 66%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11684
21783
31783
41981
52080
62080
72179
82476
92575
102674
112773
122872
132971
143169
153169
163169
173367
183466
193664
203763
213961
224159
234357
244456
254654
264951
275149
285347
295644
305842

Chance of precipitation in September

Any precipitation

Īṭahari̇̄ gets around 277 mm of rain over 24.7 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 82% 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
393
492
591
691
790
889
988
1087
1186
1285
1385
1484
1583
1683
1782
1881
1980
2079
2178
2277
2376
2474
2573
2671
2769
2867
2965
3062

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 73% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
105347
205446
305545
405743
505941
606139
706337
806535
906733
1006931
1117029
1217227
1317425
1417623
1527721
1627820
1737819
1838017
1948016
2048115
2158213
2268212
2378211
2478310
258839
269838
2710837
2811827
2913816
3015805

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:39 AM to 5:52 AM, and sunset from 6:12 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:396:12
212.55:396:11
312.55:406:10
412.55:406:09
512.45:416:08
612.45:416:07
712.45:426:05
812.45:426:04
912.35:436:03
1012.35:436:02
1112.35:436:01
1212.35:446:00
1312.25:445:58
1412.25:455:57
1512.25:455:56
1612.25:465:55
1712.15:465:54
1812.15:465:53
1912.15:475:51
2012.05:475:50
2112.05:485:49
2212.05:485:48
2312.05:495:47
2411.95:495:45
2511.95:505:44
2611.95:505:43
2711.95:505:42
2811.85:515:41
2911.85:515:40
3011.85:525:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.85 kWh/m².

For context, solar energy here swings from a low near 3.5 kWh/m² to a high of 5.95 kWh/m² in April across the year — September's 3.85 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.8Moderate
103.8Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.9Moderate
264.0Moderate
274.0Moderate
284.0Bright
294.0Bright
304.1Bright
Planning a trip in September

Hazard calendar for Īṭahari̇̄

In seasonPeak

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

Īṭahari̇̄'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 Īṭahari̇̄?

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

3.5
Sightseeing
9th-best month of the year
4.6
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Īṭahari̇̄.

What to pack for Īṭahari̇̄ in September

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

In September, Īṭahari̇̄ sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. About 25 days see rain.

light clothesrain gear

UV index in Īṭahari̇̄ in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Īṭahari̇̄ peaks around July 19 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 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 19UV 12Nov 21UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar9Very high
Apr8Very high
May9Very high
Jun8Very high
Jul12Extreme
Aug10Very high
Sep10Extreme
Oct7High
Nov4Moderate
Dec4Moderate

Air quality in Īṭahari̇̄ 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 Īṭahari̇̄ is worst in January — around 112 µg/m³ PM2.5 (unhealthy), about 4.6× the cleanest month (July, 24 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyJan 14112 µg/m³Jul 2025 µg/m³
PM2.5 (µg/m³)Level
Jan112Unhealthy
Feb103Unhealthy
Mar87Unhealthy
Apr70Unhealthy
May55Unhealthy
Jun42Poor
Jul24Moderate
Aug30Moderate
Sep39Poor
Oct61Unhealthy
Nov85Unhealthy
Dec107Unhealthy
Location & terrain

Where is Īṭahari̇̄?

Īṭahari̇̄ sits at 26.7°N, 87.3°E, 118 m above sea level, in Nepal. The nearest listed city is Inaruwa, 14 km away.

RājbirājTriyugaIlāmLahān

Topography around Īṭahari̇̄

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

Within 3 km, the terrain around Īṭahari̇̄ has only modest variations in elevation — a maximum elevation change of 29 m around an average of 112 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 655 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,441 m.

The land around Īṭahari̇̄ is covered by cropland (50%), artificial surfaces (29%) and trees (20%) within 3 km, cropland (54%) and trees (39%) within 16 km, and trees (49%) and cropland (45%) within 80 km.

3 km
29 m
16 km
655 m
80 km
3,441 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Inaruwa 14 km · Dharān 17 km · Biratnagar 23 km · Dhankutā 36 km · Rājbirāj 54 km · Triyuga 59 km · Ilām 70 km · Lahān 79 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 Īṭahari̇̄ (26.6637°, 87.274°, elevation 118 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).