Rājbirāj weather in May

In May, Rājbirāj sees average daytime highs of 35°C and overnight lows near 25°C, with 121 mm of rain across 13.9 wet days and about 13.3 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 51% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 13 hours at the start of May to 13 h 30 min by month's end. Set against the rest of the year, May is Rājbirāj's 8th-clearest and 3rd-windiest month. For the whole year in context, see Rājbirāj's year-round climate.

Daytime high
35°
2nd warmest
Overnight low
25°
8th coldest
Rainfall
121 mm
13.9 wet days
Daylight
13 h 18 min
5:15 AM – 6:33 PM
Cloud cover
43%
8th clearest
Wind
11 km/h
3rd windiest
Solar energy
5.79 kWh/m²
Travel score
2.3
out of 10

Rājbirāj is municipality in Saptari District, Nepal.

Density
1,255/km²
people per km²
Founded
1950

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 35°C through the month.

A typical May day in Rājbirāj reaches about 35°C in the afternoon and slips back to 25°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 40°C. Set against its neighbours, May runs on par with April and about 2°C warmer than June.

20°25°30°35°40°45°151015202531
Avg high (°C)Avg low (°C)
13624
23625
33625
43625
53625
63625
73625
83625
93625
103625
113625
123625
133525
143525
153525
163525
173525
183525
193525
203525
213526
223526
233526
243526
253526
263526
273526
283426
293426
303426
313426

How May really feels in Rājbirāj

Once humidity and wind are folded in, May averages 31 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
31
24 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Rājbirāj weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 11°121.610.58.9
Feb27° / 14°141.911.18.2
Mar33° / 19°162.711.84.8
Apr36° / 23°406.812.62.4
May35° / 25°12113.913.32.3
Jun33° / 26°29523.313.62.3
Jul32° / 26°42729.113.52.2
Aug32° / 26°34529.112.92.2
Sep32° / 26°30823.812.22.8
Oct31° / 22°766.911.45.1
Nov29° / 17°30.510.77.5
Dec25° / 13°40.510.49.1

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 26% of May, with mostly cloudy or overcast conditions the remaining 23%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17822
27822
37822
48020
58020
68020
78119
88119
98119
108317
118317
128218
138218
148218
158119
168020
177921
187822
197723
207525
217525
227426
237327
247327
257228
267228
277129
287129
297030
306931
316931

Chance of precipitation in May

Any precipitation

Rājbirāj gets around 121 mm of rain over 13.9 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 45% and peaks near 57% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
135
236
336
437
537
638
738
838
939
1039
1140
1240
1341
1442
1543
1644
1745
1846
1947
2048
2149
2250
2351
2451
2552
2653
2754
2855
2956
3056
3157

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the oppressive band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1641046332
2531045352
343944382
443843402
533841432
633739453
733738473
823636494
923633524
1023531545
1123529556
1213427587
1313425598
14123236110
15123216112
16122206114
17022186216
18012166318
19011146320
20011136223
21011116225
22011106028
2301195930
2401185733
2501175635
2600165538
2700155440
2800155143
2900144946
3000144748
3100134551

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 hours at the start of May to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over May. Sunrise moves from 5:26 AM to 5:10 AM, and sunset from 6:25 PM to 6:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:266:25
213.05:256:25
313.05:246:26
413.15:236:27
513.15:226:27
613.15:226:28
713.15:216:28
813.15:206:29
913.25:206:29
1013.25:196:30
1113.25:186:30
1213.25:186:31
1313.25:176:32
1413.35:166:32
1513.35:166:33
1613.35:156:33
1713.35:156:34
1813.35:146:34
1913.45:146:35
2013.45:136:35
2113.45:136:36
2213.45:126:37
2313.45:126:37
2413.45:126:38
2513.45:116:38
2613.55:116:39
2713.55:116:39
2813.55:106:40
2913.55:106:40
3013.55:106:41
3113.55:106:41

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.79 kWh/m².

For context, solar energy here swings from a low near 3.71 kWh/m² to a high of 6.31 kWh/m² in April across the year — May's 5.79 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.0Intense
96.0Intense
106.0Intense
116.0Intense
126.0Bright
135.9Bright
145.9Bright
155.9Bright
165.8Bright
175.8Bright
185.8Bright
195.7Bright
205.7Bright
215.7Bright
225.6Bright
235.6Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in May

Hazard calendar for Rājbirāj

In seasonPeak

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

Rājbirāj'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 May a good time to visit Rājbirāj?

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

2.3
Sightseeing
9th-best month of the year
5.1
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in Rājbirāj.

What to pack for Rājbirāj in May

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

In May, Rājbirāj sees daytime highs around 35°C and nights near 25°C. Pack light clothes. Worth having: rain gear and sun protection. About 14 days see rain.

light clothesrain gearsun protection

UV index in Rājbirāj in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rājbirāj peaks around July 19 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 20 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 11Jan 20UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar8Very high
Apr7High
May8Very high
Jun7High
Jul11Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec4Moderate

Air quality in Rājbirāj in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Rājbirāj is worst in January — around 243 µg/m³ PM2.5 (very unhealthy), about 5.3× the cleanest month (July, 46 µg/m³).

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

0306090120150180210240270JanFebMarAprMayJunJulAugSepOctNovDecVery unhealthyUnhealthyPoorUnhealthyVery unhealthyJan 12241 µg/m³Jul 1747 µg/m³
PM2.5 (µg/m³)Level
Jan243Very unhealthy
Feb196Very unhealthy
Mar138Unhealthy
Apr97Unhealthy
May75Unhealthy
Jun62Unhealthy
Jul46Poor
Aug58Unhealthy
Sep73Unhealthy
Oct124Unhealthy
Nov191Very unhealthy
Dec231Very unhealthy
Location & terrain

Where is Rājbirāj?

Rājbirāj sits at 26.5°N, 86.7°E, 89 m above sea level, in Nepal. The nearest listed city is Triyuga, 28 km away.

BiratnagarĪṭahari̇̄SirahaDharānDhankutā

Topography around Rājbirāj

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

Within 3 km, the terrain around Rājbirāj has only modest variations in elevation — a maximum elevation change of 27 m around an average of 83 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 378 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,952 m.

The land around Rājbirāj is covered by cropland (69%) within 3 km, cropland (67%) and trees (20%) within 16 km, and cropland (56%) and trees (38%) within 80 km.

3 km
27 m
16 km
378 m
80 km
2,952 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Triyuga 28 km · Lahān 33 km · Inaruwa 40 km · Biratnagar 53 km · Īṭahari̇̄ 54 km · Siraha 55 km · Dharān 61 km · Dhankutā 76 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 Rājbirāj (26.5397°, 86.748°, elevation 89 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).