Bản Na Hỷ weather in May

In May, Bản Na Hỷ sees average daytime highs of 30°C and overnight lows near 22°C, with 155 mm of rain across 22.2 wet days and about 12.9 hours of daylight. It is the 2nd-warmest and 5th-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 9% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of May to 13 h 06 min by month's end. Set against the rest of the year, May is Bản Na Hỷ's 8th-clearest and 7th-windiest month. For the whole year in context, see Bản Na Hỷ's year-round climate.

Daytime high
30°
2nd warmest
Overnight low
22°
9th coldest
Rainfall
155 mm
22.2 wet days
Daylight
12 h 54 min
5:30 AM – 6:26 PM
Cloud cover
79%
8th clearest
Wind
4 km/h
7th windiest
Solar energy
5.2 kWh/m²
Travel score
3.4
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical May day in Bản Na Hỷ reaches about 30°C in the afternoon and slips back to 22°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 34°C. Set against its neighbours, May runs about 2°C warmer than April and on par with June.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13021
23021
33021
43021
53021
63021
73021
83021
93021
103021
113021
123021
133021
143022
153022
163022
173022
183022
193022
203022
213022
223022
233022
243022
253022
263022
273022
283022
293122
303122
313122

How May really feels in Bản Na Hỷ

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
heat index over the day's high
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.

Bản Na Hỷ 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
Jan20° / 12°215116.8
Feb22° / 14°175.211.37.2
Mar25° / 16°429.111.96.9
Apr28° / 19°6814.812.45.1
May30° / 22°15522.212.93.4
Jun31° / 23°15822.313.23.0
Jul30° / 23°23324.413.13.1
Aug29° / 22°29826.812.73.2
Sep28° / 21°23122.612.14.1
Oct26° / 19°11815.411.55.8
Nov23° / 16°356.911.17.2
Dec20° / 13°214.910.87.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 9% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 78%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13664
23565
33565
43367
53367
63268
73169
83070
93070
102971
112872
122773
132674
142575
152377
162278
172080
182080
191882
201783
211684
221585
231585
241387
251387
261288
271288
281189
291189
301189
311090

Chance of precipitation in May

Any precipitation

Bản Na Hỷ gets around 155 mm of rain over 22.2 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 72% and peaks near 80% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
163
264
364
465
566
666
767
867
968
1068
1168
1269
1370
1470
1571
1671
1772
1872
1973
2074
2174
2275
2375
2476
2577
2677
2778
2879
2979
3080
3180

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 79% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10731620
20730630
30629650
40627670
50626680
60525700
70524710
81522720
91521730
101520740
111419760
121418770
131417780
141417780
151316800
161316791
171315801
181214821
191214821
201213831
211213831
220112861
230112861
240111871
250110881
26019891
27019891
28018901
29017911
30017911
31006931

Wind in May

Winds average 4 km/h in May.

Across May, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 42 min at the start of May to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over May. Sunrise moves from 5:38 AM to 5:27 AM, and sunset from 6:20 PM to 6:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:386:20
212.75:376:21
312.75:376:21
412.85:366:21
512.85:366:22
612.85:356:22
712.85:356:22
812.85:346:23
912.85:336:23
1012.85:336:23
1112.95:336:24
1212.95:326:24
1312.95:326:25
1412.95:316:25
1512.95:316:25
1612.95:306:26
1712.95:306:26
1812.95:306:27
1913.05:296:27
2013.05:296:27
2113.05:296:28
2213.05:286:28
2313.05:286:29
2413.05:286:29
2513.05:286:29
2613.05:286:30
2713.05:276:30
2813.15:276:31
2913.15:276:31
3013.15:276:31
3113.15:276:32

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.2 kWh/m².

For context, solar energy here swings from a low near 2.83 kWh/m² to a high of 5.21 kWh/m² in June across the year — May's 5.2 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Hazard calendar for Bản Na Hỷ

In seasonPeak

In May, Bản Na Hỷ sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Bản Na Hỷ's monsoon runs May–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 Bản Na Hỷ?

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

3.4
Sightseeing
9th-best month of the year
4.8
Beach & pool
6th-best month of the year

May is a weaker month for outdoor sightseeing in Bản Na Hỷ.

What to pack for Bản Na Hỷ in May

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

In May, Bản Na Hỷ sees daytime highs around 30°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Bản Na Hỷ in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Bản Na Hỷ peaks around August 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 7 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highExtremeVery highHighAug 13UV 14Dec 17UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar11Extreme
Apr9Very high
May9Very high
Jun14Extreme
Jul13Extreme
Aug14Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec6High

Air quality in Bản Na Hỷ 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 Bản Na Hỷ is worst in April — around 162 µg/m³ PM2.5 (very unhealthy), about 19.2× the cleanest month (August, 8 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyModerateGoodModerateApr 14150 µg/m³Aug 159 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb30Moderate
Mar83Unhealthy
Apr162Very unhealthy
May34Moderate
Jun28Moderate
Jul10Good
Aug8Good
Sep11Good
Oct15Moderate
Nov15Moderate
Dec19Moderate
Location & terrain

Where is Bản Na Hỷ?

Bản Na Hỷ sits at 19.6°N, 104.5°E, 303 m above sea level, in Vietnam. The nearest listed city is Thái Hòa, 85 km away.

Thị Trấn Lam SơnVieng XaiXam NuaKim LiênHoàng MaiDiễn ThànhThanh Hóa

Topography around Bản Na Hỷ

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

Within 3 km, the terrain around Bản Na Hỷ has large variations in elevation — a maximum elevation change of 1,158 m around an average of 625 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,938 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,684 m.

The land around Bản Na Hỷ is covered by trees (94%) within 3 km, trees (89%) within 16 km, and trees (91%) within 80 km.

3 km
1,158 m
16 km
1,938 m
80 km
2,684 m
treesgrasslandcroplandwater
May weather nearby: Thái Hòa 85 km · Thị Trấn Lam Sơn 99 km · Vieng Xai 99 km · Xam Nua 108 km · Kim Liên 112 km · Hoàng Mai 128 km · Diễn Thành 130 km · Thanh Hóa 132 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 1%

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 Bản Na Hỷ (19.5636°, 104.5346°, elevation 303 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).