Bo weather in May

In May, Bo sees average daytime highs of 31°C and overnight lows near 24°C, with 275 mm of rain across 20.2 wet days and about 13 hours of daylight. It is the 4th-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 10% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 42 min at the start of May to 13 h 12 min by month's end. Set against the rest of the year, May is Bo's 9th-clearest and 6th-windiest month. For the whole year in context, see Bo's year-round climate.

Daytime high
31°
4th warmest
Overnight low
24°
9th coldest
Rainfall
275 mm
20.2 wet days
Daylight
13 hours
5:25 AM – 6:23 PM
Cloud cover
78%
9th clearest
Wind
6 km/h
6th windiest
Solar energy
4.86 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 31°C through the month.

A typical May day in Bo reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 35°C. Set against its neighbours, May runs about 3°C warmer than April and about 1°C cooler than June.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113024
123124
133124
143124
153124
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273125
283125
293125
303225
313225

How May really feels in Bo

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.

Bo weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 14°448.510.96.0
Feb21° / 15°287.211.36.3
Mar24° / 18°5910.411.96.4
Apr28° / 21°11413.512.55.3
May31° / 24°27520.2133.4
Jun32° / 26°26721.113.22.7
Jul32° / 26°32023.613.12.7
Aug31° / 25°39326.412.72.7
Sep30° / 24°29021.112.13.6
Oct27° / 21°15614.711.55.6
Nov24° / 18°668.2117.0
Dec21° / 14°356.310.86.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 11% of May, with mostly cloudy or overcast conditions the remaining 79%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22872
32872
42872
52872
62872
72773
82773
92773
102773
112476
122476
132377
142278
152179
162179
172080
182080
191882
201783
211684
221684
231684
241585
251486
261486
271387
281387
291288
301288
311288

Chance of precipitation in May

Any precipitation

Bo gets around 275 mm of rain over 20.2 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 65% and peaks near 71% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
157
258
359
459
559
660
760
861
961
1062
1162
1263
1364
1464
1565
1666
1766
1866
1967
2067
2168
2268
2369
2469
2570
2670
2770
2871
2971
3071
3171

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the miserable band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
116154830
216154831
306144733
405144635
505134536
605134438
705124340
804124242
904124043
1004113945
1104113846
1204113748
1304113749
1403113650
1503103552
1603103453
1703103354
1803103255
190293257
200293158
210293059
220292960
230282862
240282763
250172666
260172567
270162469
280162370
290152272
300152173
310042076

Wind in May

Winds average 6 km/h in May.

Across May, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 42 min at the start of May to 13 h 12 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 5:33 AM to 5:21 AM, and sunset from 6:17 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:336:17
212.85:326:18
312.85:316:18
412.85:316:19
512.85:306:19
612.85:306:19
712.85:296:20
812.95:286:20
912.95:286:21
1012.95:276:21
1112.95:276:21
1212.95:266:22
1312.95:266:22
1413.05:266:23
1513.05:256:23
1613.05:256:23
1713.05:246:24
1813.05:246:24
1913.05:246:25
2013.05:236:25
2113.05:236:26
2213.15:236:26
2313.15:226:26
2413.15:226:27
2513.15:226:27
2613.15:226:28
2713.15:216:28
2813.15:216:29
2913.15:216:29
3013.15:216:29
3113.25:216:30

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.86 kWh/m².

For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 4.97 kWh/m² in June across the year — May's 4.86 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in May

Hazard calendar for Bo

In seasonPeak

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

Bo'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 Bo?

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
5.0
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Bo.

What to pack for Bo in May

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

In May, Bo sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Bo in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bo peaks around June 20 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highHighExtremeVery highHighJun 20UV 11Nov 22UV 6
UV index (midday)Level
Jan6High
Feb7High
Mar9Very high
Apr6High
May7High
Jun12Extreme
Jul10Extreme
Aug10Extreme
Sep7High
Oct8Very high
Nov6High
Dec6High

Air quality in Bo 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 Bo is worst in December — around 171 µg/m³ PM2.5 (very unhealthy), about 3.4× the cleanest month (July, 50 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecVery unhealthyUnhealthyPoorUnhealthyVery unhealthyDec 19170 µg/m³Jul 1452 µg/m³
PM2.5 (µg/m³)Level
Jan161Very unhealthy
Feb136Unhealthy
Mar122Unhealthy
Apr106Unhealthy
May76Unhealthy
Jun59Unhealthy
Jul50Poor
Aug68Unhealthy
Sep96Unhealthy
Oct125Unhealthy
Nov152Very unhealthy
Dec171Very unhealthy
Location & terrain

Where is Bo?

Bo sits at 20.7°N, 105.5°E, 67 m above sea level, in Vietnam. The nearest listed city is Xuân Mai, 26 km away.

Topography around Bo

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

Within 3 km, the terrain around Bo has significant variations in elevation — a maximum elevation change of 427 m around an average of 122 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,185 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,622 m.

The land around Bo is covered by trees (71%) and cropland (23%) within 3 km, trees (86%) within 16 km, and trees (60%) and cropland (27%) within 80 km.

3 km
427 m
16 km
1,185 m
80 km
1,622 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Xuân Mai 26 km · Hòa Bình 26 km · Phủ Lý 42 km · Hà Đông 42 km · Dại Mỗ 42 km · Vinhomes Smart City 43 km · Tây Mỗ 43 km · Thanh Liệt 44 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 Bo (20.6726°, 105.5362°, elevation 67 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).