Siyabuswa weather in December

In December, Siyabuswa sees average daytime highs of 31°C and overnight lows near 20°C, with 89 mm of rain across 13.2 wet days and about 13.5 hours of daylight. It is the 3rd-warmest and 2nd-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 35% of the time in December, and the air most often feels humid.

Daylight stretches from about 13 h 24 min at the start of December to 13 h 30 min by month's end. Set against the rest of the year, December is Siyabuswa's 12th-clearest and 4th-windiest month. For the whole year in context, see Siyabuswa's year-round climate.

Daytime high
31°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
89 mm
13.2 wet days
Daylight
13 h 36 min
5:13 AM – 6:47 PM
Cloud cover
55%
12th clearest
Wind
8 km/h
4th windiest
Solar energy
6.73 kWh/m²
Travel score
4.4
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 December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical December day in Siyabuswa reaches about 31°C in the afternoon and slips back to 20°C overnight — a 11°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, December runs on par with November and on par with January.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13019
23019
33019
43019
53019
63019
73019
83019
93019
103019
113019
123019
133019
143119
153119
163120
173120
183120
193120
203120
213120
223120
233120
243120
253120
263120
273120
283120
293120
303120
313120

Siyabuswa weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 2nd-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 December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 22% of December, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35347
45446
55347
65446
75446
85545
95644
105743
115743
125743
135842
145842
155941
165941
175941
185941
195941
205941
215941
225842
235842
245842
255842
265842
275941
286040
296040
306139
316139

Chance of precipitation in December

Any precipitation

Siyabuswa gets around 89 mm of rain over 13.2 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 42% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
241
341
442
542
643
743
843
944
1044
1144
1244
1343
1443
1542
1642
1741
1841
1940
2040
2140
2240
2340
2441
2541
2641
2741
2841
2941
3041
3141

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the humid band about 45% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12040374
21940374
31840384
41740394
51740404
61640404
71540414
81439425
91339435
101239445
111139456
121038456
131038466
14938467
15838467
16837478
17837478
18737479
197364710
207364710
217354711
227344712
237344712
247334713
256324814
267314814
277314814
287304914
297294915
308294915
318284915

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 24 min at the start of December to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:10 AM to 5:21 AM, and sunset from 6:37 PM to 6:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:106:37
213.55:106:38
313.55:106:38
413.55:106:39
513.55:106:40
613.55:116:40
713.55:116:41
813.55:116:42
913.55:116:42
1013.55:116:43
1113.55:126:44
1213.55:126:44
1313.55:126:45
1413.55:136:45
1513.65:136:46
1613.65:136:47
1713.65:146:47
1813.65:146:48
1913.65:156:48
2013.65:156:49
2113.65:156:49
2213.65:166:50
2313.65:166:50
2413.65:176:51
2513.65:176:51
2613.65:186:51
2713.65:186:52
2813.65:196:52
2913.65:206:53
3013.55:206:53
3113.55:216:53

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.73 kWh/m² — the sunniest month for solar.

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 — December's 6.73 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.6Intense
46.6Intense
56.6Intense
66.6Intense
76.6Intense
86.6Intense
96.6Intense
106.7Intense
116.7Intense
126.7Intense
136.7Intense
146.7Intense
156.8Intense
166.8Intense
176.8Intense
186.8Intense
196.8Intense
206.8Intense
216.8Intense
226.8Intense
236.8Intense
246.8Intense
256.8Intense
266.8Intense
276.8Intense
286.8Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in December

Hazard calendar for Siyabuswa

In seasonPeak

In December, Siyabuswa sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

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 December a good time to visit Siyabuswa?

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

4.4
Sightseeing
11th-best month of the year
6.3
Beach & pool
12th-best month of the year

December is a reasonable time to visit Siyabuswa for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Siyabuswa in December

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

In December, Siyabuswa sees daytime highs around 31°C and nights near 20°C. Pack light clothes and sun protection. Worth having: rain gear. About 13 days see rain.

light clothessun protectionrain gear

UV index in Siyabuswa in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). 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 December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December 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
December 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).