Janakpur weather in September

In September, Janakpur sees average daytime highs of 32°C and overnight lows near 25°C, with 225 mm of rain across 21.4 wet days and about 12.2 hours of daylight. It is the 7th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 26% of the time in September, and the air most often feels miserable.

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 Janakpur's 10th-clearest and 7th-windiest month. For the whole year in context, see Janakpur's year-round climate.

Daytime high
32°
7th warmest
Overnight low
25°
8th coldest
Rainfall
225 mm
21.4 wet days
Daylight
12 h 12 min
5:51 AM – 6:00 PM
Cloud cover
65%
10th clearest
Wind
7 km/h
7th windiest
Solar energy
4.17 kWh/m²
Travel score
3.0
out of 10

Janakpur is city in Dhanusha District, Nepal.

Density
1,950/km²
people per km²
Founded
1800

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 32°C through the month.

A typical September day in Janakpur reaches about 32°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 34°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)
13226
23226
33226
43226
53226
63226
73226
83226
93226
103226
113226
123226
133226
143226
153226
163225
173225
183225
193225
203225
213225
223225
233225
243225
253225
263225
273225
283225
293224
303224

How September really feels in Janakpur

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
20 feel dangerously hot (≥ 39°C)
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.

Janakpur weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 10°141.910.58.7
Feb27° / 13°13211.18.3
Mar32° / 18°112.111.84.9
Apr36° / 23°275.112.62.3
May36° / 26°8711.713.32.0
Jun34° / 27°22920.713.62.1
Jul32° / 26°39826.813.52.3
Aug32° / 26°27026.112.92.4
Sep32° / 25°22521.412.23.0
Oct31° / 22°535.511.45.3
Nov29° / 16°30.410.77.7
Dec25° / 12°50.710.49.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% 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 59%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12377
22476
32575
42674
52872
62971
73169
83268
93367
103466
113565
123664
133763
143763
153961
163961
174159
184258
194357
204555
214753
224852
235050
245248
255545
265644
275941
286139
296337
306634

Chance of precipitation in September

Any precipitation

Janakpur gets around 225 mm of rain over 21.4 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 70% and peaks near 82% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
182
281
381
481
580
680
779
879
978
1077
1176
1276
1375
1474
1573
1673
1772
1871
1969
2068
2167
2265
2363
2462
2560
2658
2756
2854
2952
3049

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 87% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
10298
20298
30298
40298
50397
60397
70397
80397
90496
100496
110496
120595
130694
140793
150892
160991
1701090
1801189
1911386
2011485
2111683
2211881
2322078
2422276
2522474
2622672
2732869
2833067
2943363
3043660

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:44 AM to 5:57 AM, and sunset from 6:18 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:446:18
212.55:456:17
312.55:456:15
412.55:466:14
512.45:466:13
612.45:476:12
712.45:476:11
812.45:476:10
912.35:486:09
1012.35:486:07
1112.35:496:06
1212.35:496:05
1312.25:506:04
1412.25:506:03
1512.25:516:01
1612.25:516:00
1712.15:515:59
1812.15:525:58
1912.15:525:57
2012.05:535:56
2112.05:535:54
2212.05:545:53
2312.05:545:52
2411.95:555:51
2511.95:555:50
2611.95:555:49
2711.95:565:47
2811.85:565:46
2911.85:575:45
3011.85:575:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.17 kWh/m².

For context, solar energy here swings from a low near 3.75 kWh/m² to a high of 6.59 kWh/m² in April across the year — September's 4.17 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.2Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Janakpur

In seasonPeak

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

Janakpur'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 Janakpur?

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

3.0
Sightseeing
7th-best month of the year
4.8
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Janakpur.

What to pack for Janakpur in September

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

In September, Janakpur sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. About 21 days see rain.

light clothesrain gear

UV index in Janakpur 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 Janakpur peaks around July 19 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 highVery highModerateJul 19UV 11Nov 22UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar8Very high
Apr7Very high
May8Very high
Jun7High
Jul11Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec4Moderate

Air quality in Janakpur 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 Janakpur is worst in January — around 169 µg/m³ PM2.5 (very unhealthy), about 4.9× the cleanest month (July, 35 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecVery unhealthyUnhealthyPoorUnhealthyJan 12167 µg/m³Jul 2036 µg/m³
PM2.5 (µg/m³)Level
Jan169Very unhealthy
Feb138Unhealthy
Mar107Unhealthy
Apr87Unhealthy
May70Unhealthy
Jun57Unhealthy
Jul35Moderate
Aug43Poor
Sep55Unhealthy
Oct87Unhealthy
Nov125Unhealthy
Dec160Very unhealthy
Location & terrain

Where is Janakpur?

Janakpur sits at 26.7°N, 85.9°E, 83 m above sea level, in Nepal. The nearest listed city is Jaleshwar, 15 km away.

LahānGaurTriyugaRājbirājPanauti

Topography around Janakpur

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

Within 3 km, the terrain around Janakpur has only modest variations in elevation — a maximum elevation change of 17 m around an average of 75 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 70 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,457 m.

The land around Janakpur is covered by cropland (49%) and artificial surfaces (32%) within 3 km, cropland (74%) within 16 km, and cropland (55%) and trees (39%) within 80 km.

3 km
17 m
16 km
70 m
80 km
2,457 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Jaleshwar 15 km · Siraha 29 km · Malaṅgawā 39 km · Lahān 55 km · Gaur 65 km · Triyuga 77 km · Rājbirāj 84 km · Panauti 103 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 Janakpur (26.7288°, 85.9263°, elevation 83 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).