Boyolali weather in May

In May, Boyolali sees average daytime highs of 29°C and overnight lows near 21°C, with 148 mm of rain across 20.4 wet days and about 11.7 hours of daylight. It is the 1st-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 13% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 11 h 42 min at the start of May to 11 h 36 min by month's end. Set against the rest of the year, May is Boyolali's 5th-clearest and 8th-windiest month. For the whole year in context, see Boyolali's year-round climate.

Daytime high
29°
1st warmest
Overnight low
21°
11th coldest
Rainfall
148 mm
20.4 wet days
Daylight
11 h 42 min
5:44 AM – 5:24 PM
Cloud cover
70%
5th clearest
Wind
4 km/h
8th windiest
Solar energy
4.87 kWh/m²
Travel score
4.3
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical May day in Boyolali reaches about 29°C in the afternoon and slips back to 21°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, May runs on par with April and on par with June.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12921
22921
32921
42921
52921
62921
72921
82921
92921
102921
112921
122921
132921
142921
152921
162921
172921
182921
192921
202921
212921
222921
232921
242921
252921
262921
272921
282921
292821
302821
312821

Boyolali weather by month

How May compares with the rest of the year at a glance. May is the 1st-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 21°44729.212.43.2
Feb28° / 21°45127.412.23.0
Mar29° / 21°40729.312.13.0
Apr29° / 21°28226.711.83.3
May29° / 21°14820.411.74.3
Jun28° / 20°9614.711.65.3
Jul28° / 19°6210.411.66.3
Aug28° / 19°426.811.86.8
Sep28° / 20°719.6125.7
Oct29° / 21°17919.712.24.3
Nov29° / 21°34026.912.33.3
Dec28° / 21°38727.912.43.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 20% of May, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12575
22575
32674
42674
52674
62674
72773
82773
92872
102872
113070
123070
133169
143268
153466
163565
173565
183664
193763
203763
213862
223862
233862
243862
253961
263961
273862
283763
293763
303664
313664

Chance of precipitation in May

Any precipitation

Boyolali gets around 148 mm of rain over 20.4 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 66% and peaks near 78% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
178
277
376
476
575
674
773
872
971
1070
1169
1268
1367
1466
1565
1664
1763
1862
1962
2061
2160
2260
2359
2459
2559
2658
2758
2858
2958
3058
3158

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 67% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
101684
201783
301783
401882
511980
612079
712178
812277
912376
1012574
1112673
1222771
1322870
1423068
1523167
1623266
1723365
1833463
1933562
2033661
2133760
2233859
2333958
2434057
2534156
2634156
2734255
2834255
2934354
3034354
3134354

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 11 h 42 min at the start of May to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over May. Sunrise moves from 5:43 AM to 5:47 AM, and sunset from 5:27 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:435:27
211.75:435:27
311.75:435:26
411.75:435:26
511.75:435:26
611.75:435:26
711.75:435:25
811.75:435:25
911.75:435:25
1011.75:435:25
1111.75:435:24
1211.75:445:24
1311.75:445:24
1411.75:445:24
1511.75:445:24
1611.75:445:24
1711.75:445:23
1811.65:445:23
1911.65:455:23
2011.65:455:23
2111.65:455:23
2211.65:455:23
2311.65:455:23
2411.65:465:23
2511.65:465:23
2611.65:465:23
2711.65:465:23
2811.65:465:23
2911.65:475:23
3011.65:475:23
3111.65:475:23

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.87 kWh/m².

For context, solar energy here swings from a low near 4.49 kWh/m² to a high of 5.86 kWh/m² in September across the year — May's 4.87 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
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
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in May

Hazard calendar for Boyolali

In seasonPeak

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

Boyolali sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Boyolali's rainy season runs November–April, when most of the year's rain falls.

Cyclone
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Boyolali?

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

4.3
Sightseeing
5th-best month of the year
5.2
Beach & pool
6th-best month of the year

May is a reasonable time to visit Boyolali for sightseeing.

What to pack for Boyolali in May

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

In May, Boyolali sees daytime highs around 29°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

Sea temperature near Boyolali in May

The nearest coast averages about 29°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 64 km away) is warmest in March at about 29°C and coldest in August near 25°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun28Warm
Jul26Warm
Aug25Warm
Sep25Warm
Oct26Warm
Nov28Warm
Dec29Tropical

UV index in Boyolali in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Boyolali peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 14 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highVery highExtremeExtremeMar 14UV 15Jun 14UV 6
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr12Extreme
May8Very high
Jun6High
Jul10Very high
Aug11Extreme
Sep13Extreme
Oct13Extreme
Nov9Very high
Dec11Extreme

Air quality in Boyolali 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 Boyolali is worst in April — around 58 µg/m³ PM2.5 (unhealthy), about 1.7× the cleanest month (September, 34 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorModeratePoorApr 2158 µg/m³Sep 1134 µg/m³
PM2.5 (µg/m³)Level
Jan48Poor
Feb46Poor
Mar54Poor
Apr58Unhealthy
May57Unhealthy
Jun51Poor
Jul42Poor
Aug35Moderate
Sep34Moderate
Oct37Poor
Nov42Poor
Dec42Poor
Location & terrain

Where is Boyolali?

Boyolali sits at 7.5°S, 110.6°E, 438 m above sea level, in Indonesia. The nearest listed city is Karanganom, 13 km away.

Topography around Boyolali

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

Within 3 km, the terrain around Boyolali has significant variations in elevation — a maximum elevation change of 260 m around an average of 440 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,558 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,291 m.

The land around Boyolali is covered by trees (64%) and artificial surfaces (31%) within 3 km, trees (67%) within 16 km, and trees (61%) and cropland (21%) within 80 km.

3 km
260 m
16 km
2,558 m
80 km
3,291 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Karanganom 13 km · Delanggu 13 km · Ngemplak 13 km · Gatak 14 km · Kartasura 16 km · Colomadu 17 km · Ceper 18 km · Kebonarun 19 km

Indonesia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,060
2025
Happiness
5.6 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
0.3
per 100k, 2022
Road deaths
11.3
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 471
Religion
Muslim 87%Protestant 8%Roman Catholic 3%Hindu 2%

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 Boyolali (-7.5331°, 110.5958°, elevation 438 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).