Northam weather in September

In September, Northam sees average daytime highs of 29°C and overnight lows near 14°C, with 12 mm of rain across 1.9 wet days and about 11.8 hours of daylight. It is the 6th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 27°C in the first days to 30°C by the end. The sky is clear or mostly clear about 78% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Northam's 5th-clearest and 2nd-windiest month. For the whole year in context, see Northam's year-round climate.

Daytime high
29°
6th warmest
Overnight low
14°
5th coldest
Rainfall
12 mm
1.9 wet days
Daylight
11 h 54 min
6:10 AM – 6:01 PM
Cloud cover
22%
5th clearest
Wind
9 km/h
2nd windiest
Solar energy
6.09 kWh/m²
Travel score
7.5
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 27°C in the first days to 30°C by the end.

A typical September day in Northam reaches about 29°C in the afternoon and slips back to 14°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 33°C. Set against its neighbours, September runs about 4°C warmer than August and about 2°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12712
22712
32713
42713
52713
62813
72813
82813
92814
102814
112814
122814
132814
142914
152914
162915
172915
182915
192915
202915
212915
222915
232916
242916
253016
263016
273016
283016
293016
303016

Northam weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 20°9912.313.44.8
Feb30° / 20°869.812.95.1
Mar29° / 18°738.812.26.2
Apr26° / 15°365.211.47.8
May24° / 10°152.110.89.0
Jun22° / 60.810.58.9
Jul21° / 30.610.68.9
Aug25° / 10°30.611.19.3
Sep29° / 14°121.911.87.5
Oct30° / 17°416.812.65.6
Nov30° / 19°7710.713.24.8
Dec30° / 20°10413.413.54.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 78% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 13%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1928
2928
3919
4919
5919
69010
79010
89010
98911
108911
118812
128812
138812
148614
158614
168614
178614
188515
198515
208515
218515
228515
238416
248416
258416
268416
278416
288416
298416
308416

Chance of precipitation in September

Any precipitation

Northam gets around 12 mm of rain over 1.9 wet days in September. 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 13% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
15
25
35
45
55
65
75
85
96
106
116
126
136
146
156
166
176
186
196
206
217
227
238
249
259
2610
2711
2812
2913
3013

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59910
69910
79910
89910
99910
109910
119910
129910
139910
149910
159910
169820
179820
189820
199820
209820
219730
229730
239640
249640
259550
269460
279370
289280
299190
3089101

Wind in September

Winds average 9 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over September. Sunrise moves from 6:26 AM to 5:54 AM, and sunset from 5:55 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:265:55
211.56:255:56
311.56:245:56
411.66:235:56
511.66:225:57
611.66:215:57
711.66:205:58
811.76:185:58
911.76:175:58
1011.76:165:59
1111.76:155:59
1211.86:145:59
1311.86:136:00
1411.86:126:00
1511.86:116:01
1611.96:106:01
1711.96:086:01
1811.96:076:02
1911.96:066:02
2012.06:056:02
2112.06:046:03
2212.06:036:03
2312.06:026:04
2412.16:016:04
2512.16:006:04
2612.15:586:05
2712.15:576:05
2812.25:566:06
2912.25:556:06
3012.25:546:06

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.09 kWh/m².

For context, solar energy here swings from a low near 3.95 kWh/m² to a high of 6.73 kWh/m² in December across the year — September's 6.09 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.7Bright
35.7Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.9Bright
95.9Bright
105.9Bright
116.0Bright
126.0Bright
136.0Intense
146.0Intense
156.1Intense
166.1Intense
176.1Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.5Intense
Planning a trip in September

Hazard calendar for Northam

In seasonPeak

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

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

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

Is September a good time to visit Northam?

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

7.5
Sightseeing
6th-best month of the year
8.7
Beach & pool
1st-best month of the year

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

What to pack for Northam in September

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

In September, Northam sees daytime highs around 29°C and nights near 14°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Northam in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Northam peaks around January 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 16 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 16UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr9Very high
May6High
Jun5Moderate
Jul6High
Aug7Very high
Sep9Very high
Oct10Extreme
Nov12Extreme
Dec14Extreme

Air quality in Northam in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Northam is worst in July — around 35 µg/m³ PM2.5 (poor), about 4.5× the cleanest month (December, 8 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1135 µg/m³Dec 208 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb12Moderate
Mar15Moderate
Apr22Moderate
May31Moderate
Jun34Moderate
Jul35Poor
Aug29Moderate
Sep30Moderate
Oct18Moderate
Nov10Good
Dec8Good
Location & terrain

Where is Northam?

Northam sits at 25.0°S, 27.3°E, 1,016 m above sea level, in South Africa. The nearest listed city is Amandelbult, 16 km away.

Topography around Northam

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

Within 3 km, the terrain around Northam has only modest variations in elevation — a maximum elevation change of 40 m around an average of 1,010 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 342 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,207 m.

The land around Northam is covered by shrubs (39%) and grassland (30%) within 3 km, shrubs (50%) and grassland (24%) within 16 km, and shrubs (55%) and grassland (25%) within 80 km.

3 km
40 m
16 km
342 m
80 km
1,207 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Amandelbult 16 km · Thabazimbi 43 km · Hartbeestfontein-A 59 km · Rustenburg 79 km · Letlhabile 82 km · Marikana 85 km · Brits 91 km · Mabopane 101 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 Northam (-24.9578°, 27.2654°, elevation 1,016 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).