Siraha weather in September

In September, Siraha sees average daytime highs of 31°C and overnight lows near 25°C, with 220 mm of rain across 21.3 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 31°C through the month. The sky is clear or mostly clear about 25% 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 Siraha's 10th-clearest and 7th-windiest month. For the whole year in context, see Siraha's year-round climate.

Daytime high
31°
7th warmest
Overnight low
25°
8th coldest
Rainfall
220 mm
21.3 wet days
Daylight
12 h 12 min
5:50 AM – 5:59 PM
Cloud cover
65%
10th clearest
Wind
7 km/h
7th windiest
Solar energy
4.11 kWh/m²
Travel score
3.2
out of 10

Siraha is municipality in Siraha District, Nepal.

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 31°C through the month.

A typical September day in Siraha reaches about 31°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 33°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
113126
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263124
273124
283124
293124
303124

How September really feels in Siraha

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
16 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.

Siraha 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°121.610.58.7
Feb26° / 13°111.611.18.4
Mar32° / 18°112.411.85.0
Apr36° / 23°265.312.62.5
May36° / 25°8511.713.32.2
Jun34° / 26°22920.813.62.3
Jul32° / 26°39326.413.52.5
Aug32° / 26°25826.112.92.5
Sep31° / 25°22021.312.23.2
Oct31° / 21°50511.45.5
Nov28° / 16°20.310.77.9
Dec24° / 12°40.610.49.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12377
22476
32575
42674
52773
62872
73070
83268
93367
103466
113664
123763
133862
143862
153961
164060
174159
184159
194258
204555
214555
224753
234852
245149
255347
265446
275743
285941
296238
306436

Chance of precipitation in September

Any precipitation

Siraha gets around 220 mm of rain over 21.3 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 83% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
183
283
382
481
581
680
779
878
977
1076
1175
1274
1374
1473
1573
1672
1771
1871
1969
2068
2167
2265
2363
2461
2559
2657
2755
2852
2950
3047

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

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
10397
20397
30397
40397
50397
60496
70496
80496
90595
100595
110694
120793
130892
140991
1501090
1601189
1701387
1811485
1911683
2011881
2112079
2212178
2322375
2422573
2522771
2633067
2733265
2833562
2943759
3054055

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.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
127calm
137calm
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 5:43 AM to 5:56 AM, and sunset from 6:16 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:436:16
212.55:446:15
312.55:446:14
412.55:456:13
512.45:456:12
612.45:456:11
712.45:466:10
812.45:466:09
912.35:476:07
1012.35:476:06
1112.35:486:05
1212.35:486:04
1312.25:496:03
1412.25:496:02
1512.25:496:00
1612.25:505:59
1712.15:505:58
1812.15:515:57
1912.15:515:56
2012.05:525:54
2112.05:525:53
2212.05:525:52
2312.05:535:51
2411.95:535:50
2511.95:545:49
2611.95:545:47
2711.95:555:46
2811.85:555:45
2911.85:565:44
3011.85:565:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.11 kWh/m².

For context, solar energy here swings from a low near 3.7 kWh/m² to a high of 6.49 kWh/m² in April across the year — September's 4.11 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
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
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.3Bright
Planning a trip in September

Hazard calendar for Siraha

In seasonPeak

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

Siraha'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 Siraha?

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

3.2
Sightseeing
7th-best month of the year
4.9
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Siraha.

What to pack for Siraha in September

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

In September, Siraha sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 21 days see rain.

light clothesrain gear

UV index in Siraha 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 Siraha peaks around July 19 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 18 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 11Jan 18UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar9Very high
Apr7Very high
May8Very high
Jun7High
Jul12Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec4Moderate

Air quality in Siraha 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 Siraha 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 Siraha?

Siraha sits at 26.7°N, 86.2°E, 82 m above sea level, in Nepal. The nearest listed city is Lahān, 28 km away.

TriyugaRājbirājMalaṅgawāGaurInaruwa

Topography around Siraha

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

Within 3 km, the terrain around Siraha has only modest variations in elevation — a maximum elevation change of 15 m around an average of 75 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 67 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,775 m.

The land around Siraha is covered by cropland (67%) within 3 km, cropland (78%) within 16 km, and cropland (54%) and trees (38%) within 80 km.

3 km
15 m
16 km
67 m
80 km
2,775 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Lahān 28 km · Janakpur 29 km · Jaleshwar 41 km · Triyuga 51 km · Rājbirāj 55 km · Malaṅgawā 68 km · Gaur 93 km · Inaruwa 94 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 Siraha (26.6542°, 86.2079°, elevation 82 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).