Delmas weather in December

In December, Delmas sees average daytime highs of 25°C and overnight lows near 15°C, with 138 mm of rain across 17.5 wet days and about 13.6 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 27% of the time in December, and the air most often feels comfortable.

Daylight stretches from about 13 h 30 min at the start of December to 13 h 36 min by month's end. Set against the rest of the year, December is Delmas's 12th-clearest and 5th-windiest month. For the whole year in context, see Delmas's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
138 mm
17.5 wet days
Daylight
13 h 36 min
5:13 AM – 6:50 PM
Cloud cover
59%
12th clearest
Wind
11 km/h
5th windiest
Solar energy
6.71 kWh/m²
Travel score
5.7
out of 10

Delmas is South African town in Mpumalanga.

Density
10,532/km²
people per km²
Founded
1907

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 25°C through the month.

A typical December day in Delmas reaches about 25°C in the afternoon and slips back to 15°C overnight — a 11°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, December runs on par with November and on par with January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12514
22514
32514
42514
52514
62514
72514
82514
92515
102515
112515
122515
132515
142515
152515
162515
172515
182615
192615
202615
212615
222615
232615
242615
252615
262615
272615
282615
292615
302615
312615

Delmas weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 15°12816.213.55.9
Feb26° / 15°10512.912.96.2
Mar25° / 14°8911.212.27.0
Apr23° / 11°406.611.47.6
May21° / 152.610.78.2
Jun18° / 71.110.48.1
Jul18° / 40.710.58.1
Aug21° / 112.111.18.5
Sep25° / 10°243.411.88.5
Oct25° / 12°8310.812.67.0
Nov25° / 14°1041413.36.2
Dec25° / 15°13817.513.65.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 25% of December, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
34951
45050
54951
65050
75149
85149
95248
105149
115248
125248
135347
145347
155446
165347
175347
185347
195347
205248
215248
225248
235149
245149
255248
265248
275248
285347
295446
305545
315545

Chance of precipitation in December

Any precipitation

Delmas gets around 138 mm of rain over 17.5 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 56% and peaks near 58% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
153
254
355
456
556
657
757
858
958
1058
1158
1257
1357
1457
1556
1655
1755
1855
1955
2054
2155
2255
2355
2455
2555
2655
2755
2855
2954
3054
3153

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the comfortable band about 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
147466
246486
345497
443507
542508
640528
739538
838539
936559
10355510
11335710
12325810
13315811
14305911
15295912
16276013
17266014
18256015
19246016
20236017
21225919
22215920
23215821
24205723
25205624
26195625
27195526
28195427
29195328
30195229
31205129

Wind in December

Winds average 11 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 30 min at the start of December to 13 h 36 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 5:09 AM to 5:20 AM, and sunset from 6:41 PM to 6:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:096:41
213.55:096:41
313.55:106:42
413.65:106:43
513.65:106:43
613.65:106:44
713.65:106:45
813.65:106:45
913.65:116:46
1013.65:116:47
1113.65:116:47
1213.65:116:48
1313.65:126:49
1413.65:126:49
1513.65:126:50
1613.65:136:50
1713.65:136:51
1813.65:136:51
1913.65:146:52
2013.65:146:52
2113.65:156:53
2213.65:156:53
2313.65:166:54
2413.65:166:54
2513.65:176:55
2613.65:176:55
2713.65:186:56
2813.65:186:56
2913.65:196:56
3013.65:196:57
3113.65:206:57

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.71 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.92 kWh/m² to a high of 6.71 kWh/m² in December across the year — December's 6.71 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
106.6Intense
116.7Intense
126.7Intense
136.7Intense
146.7Intense
156.7Intense
166.7Intense
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 Delmas

In seasonPeak

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

Delmas'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 Delmas?

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

5.7
Sightseeing
12th-best month of the year
5.3
Beach & pool
8th-best month of the year

December is a reasonable time to visit Delmas for sightseeing.

What to pack for Delmas in December

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

In December, Delmas sees daytime highs around 25°C and nights near 15°C. Pack rain gear and sun protection. Worth having: light clothes. About 18 days see rain.

rain gearsun protectionlight clothes

UV index in Delmas 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 Delmas peaks around January 1 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 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 1UV 14Jun 19UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr9Very high
May6High
Jun5High
Jul6High
Aug7Very high
Sep9Very high
Oct10Extreme
Nov12Extreme
Dec14Extreme

Air quality in Delmas 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 Delmas is worst in June — around 259 µg/m³ PM2.5 (very unhealthy), about 6.0× the cleanest month (January, 43 µg/m³).

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

0306090120150180210240270JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyVery unhealthyUnhealthyPoorJun 23259 µg/m³Jan 1344 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb63Unhealthy
Mar101Unhealthy
Apr158Very unhealthy
May232Very unhealthy
Jun259Very unhealthy
Jul259Very unhealthy
Aug200Very unhealthy
Sep144Unhealthy
Oct91Unhealthy
Nov65Unhealthy
Dec50Poor
Location & terrain

Where is Delmas?

Delmas sits at 26.1°S, 28.7°E, 1,558 m above sea level, in South Africa. The nearest listed city is Etwatwa, 23 km away.

Topography around Delmas

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

Within 3 km, the terrain around Delmas has only modest variations in elevation — a maximum elevation change of 57 m around an average of 1,559 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 191 m; within 80 km, large variations in elevation — a maximum elevation change of 795 m.

The land around Delmas is covered by cropland (46%) and grassland (33%) within 3 km, cropland (59%) and grassland (35%) within 16 km, and grassland (56%) and cropland (28%) within 80 km.

3 km
57 m
16 km
191 m
80 km
795 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Etwatwa 23 km · Springs 31 km · Brakpan 33 km · Leslie 34 km · Lebohang 35 km · Benoni 36 km · Nigel 38 km · Bronkhorstspruit 38 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 Delmas (-26.1466°, 28.6832°, elevation 1,558 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).