Siyabuswa weather in May

In May, Siyabuswa sees average daytime highs of 25°C and overnight lows near 11°C, with 13 mm of rain across 2.2 wet days and about 10.8 hours of daylight. It is the 10th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 24°C by the end. The sky is clear or mostly clear about 83% of the time in May, and the air most often feels dry.

Daylight stretches from about 11 h 06 min at the start of May to 10 h 36 min by month's end. Set against the rest of the year, May is Siyabuswa's 4th-clearest and 12th-windiest month. For the whole year in context, see Siyabuswa's year-round climate.

Daytime high
25°
10th warmest
Overnight low
11°
4th coldest
Rainfall
13 mm
2.2 wet days
Daylight
10 h 48 min
6:37 AM – 5:24 PM
Cloud cover
18%
4th clearest
Wind
6 km/h
12th windiest
Solar energy
4.42 kWh/m²
Travel score
8.9
out of 10

Siyabuswa is place in Mpumalanga, South Africa.

Density
2,970/km²
people per km²

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 24°C by the end.

A typical May day in Siyabuswa reaches about 25°C in the afternoon and slips back to 11°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 29°C. Set against its neighbours, May runs about 2°C cooler than April and about 3°C warmer than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12713
22713
32713
42613
52613
62612
72612
82612
92612
102612
112612
122612
132611
142611
152511
162511
172511
182511
192510
202510
212510
222510
232510
242510
25249
26249
27249
28249
29249
30249
31249

Siyabuswa weather by month

How May compares with the rest of the year at a glance. May is the 10th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 20°9112.413.44.3
Feb31° / 20°669.212.94.6
Mar30° / 19°618.312.25.6
Apr28° / 15°324.711.47.5
May25° / 11°132.210.88.9
Jun23° / 40.810.59.2
Jul23° / 30.510.69.2
Aug26° / 10°4111.19.1
Sep29° / 14°12211.87.0
Oct30° / 17°477.212.65.5
Nov30° / 18°8211.213.24.8
Dec31° / 20°8913.213.54.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 83% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 8% of May, with mostly cloudy or overcast conditions the remaining 10%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18614
28713
38713
48713
58911
68911
79010
89010
99010
10919
11919
129010
139010
149010
159010
169010
178911
188911
198911
209010
219010
229010
23919
24919
25928
26937
27937
28937
29937
30937
31937

Chance of precipitation in May

Any precipitation

Siyabuswa gets around 13 mm of rain over 2.2 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 7% and peaks near 12% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
112
211
311
410
510
69
79
89
99
108
118
128
138
148
157
167
177
187
197
206
216
226
236
245
255
265
275
284
294
304
314

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
183161
284151
385141
488120
589110
690100
79190
89280
99280
109370
119460
129550
139640
149640
159730
169730
179820
189820
199820
209910
219910
229910
239910
249910
259910
269910
2710000
2810000
2910000
3010000
3110000

Wind in May

Winds average 6 km/h in May, the calmest month.

Across May, daily wind ranges from about 6 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
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 06 min at the start of May to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over May. Sunrise moves from 6:29 AM to 6:44 AM, and sunset from 5:33 PM to 5:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.16:295:33
211.16:295:32
311.06:305:32
411.06:305:31
511.06:315:30
611.06:315:29
710.96:325:29
810.96:325:28
910.96:335:28
1010.96:335:27
1110.96:345:26
1210.96:355:26
1310.86:355:25
1410.86:365:25
1510.86:365:24
1610.86:375:24
1710.86:375:23
1810.76:385:23
1910.76:385:22
2010.76:395:22
2110.76:395:21
2210.76:405:21
2310.76:405:20
2410.76:415:20
2510.66:415:20
2610.66:425:19
2710.66:425:19
2810.66:435:19
2910.66:435:19
3010.66:445:18
3110.66:445:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.42 kWh/m².

For context, solar energy here swings from a low near 3.98 kWh/m² to a high of 6.73 kWh/m² in December across the year — May's 4.42 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
314.2Bright
Planning a trip in May

Hazard calendar for Siyabuswa

In seasonPeak

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

Siyabuswa's rainy season runs October–March, when most of the year's rain falls.

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

Is May a good time to visit Siyabuswa?

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

8.9
Sightseeing
4th-best month of the year
8.0
Beach & pool
3rd-best month of the year

May is one of the better times to visit Siyabuswa for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Siyabuswa in May

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

In May, Siyabuswa sees daytime highs around 25°C and nights near 11°C. Worth packing: light clothes.

light clothes

UV index in Siyabuswa in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Siyabuswa peaks around January 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 13UV 14Jun 17UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr8Very high
May6High
Jun5High
Jul6High
Aug7Very high
Sep9Very high
Oct10Extreme
Nov11Extreme
Dec14Extreme

Air quality in Siyabuswa 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 Siyabuswa is worst in July — around 48 µg/m³ PM2.5 (poor), about 4.8× the cleanest month (December, 10 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodJul 1447 µg/m³Dec 2310 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar17Moderate
Apr27Moderate
May40Poor
Jun45Poor
Jul48Poor
Aug43Poor
Sep34Moderate
Oct20Moderate
Nov13Moderate
Dec10Good
Location & terrain

Where is Siyabuswa?

Siyabuswa sits at 25.1°S, 29.0°E, 935 m above sea level, in South Africa. The nearest listed city is Vaalbank, 20 km away.

Topography around Siyabuswa

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

Within 3 km, the terrain around Siyabuswa has only modest variations in elevation — a maximum elevation change of 84 m around an average of 925 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 457 m; within 80 km, large variations in elevation — a maximum elevation change of 1,139 m.

The land around Siyabuswa is covered by artificial surfaces (39%), shrubs (30%) and grassland (20%) within 3 km, shrubs (46%) and grassland (25%) within 16 km, and grassland (41%) and shrubs (32%) within 80 km.

3 km
84 m
16 km
457 m
80 km
1,139 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
May weather nearby: Vaalbank 20 km · Kwaggafontein 26 km · Somaroboro 33 km · Verena 41 km · Moloto South 56 km · Ekangala 69 km · Mookgophong 74 km · Modimolle 80 km

South Africa travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / M / N
230 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$6,598
2025
Happiness
5.0 / 10
World Happiness, 2025
Safe drinking water
68%
of population, 2024
Homicide rate
43.7
per 100k, 2022
Road deaths
22.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very high
EF EPI 602
Religion
Christian 86%or other traditional African religions 5%nothing in particular 5%Muslim 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 Siyabuswa (-25.1132°, 29.0445°, elevation 935 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).