Monthly climate guide
Newcastle weather in September
Expect hot weather in Newcastle in September: afternoons reach about 28°C (82°F), while nights drop to around 10°C (50°F). Around 35 mm of rain falls over the month (fairly dry), and skies are mostly sunny. Daytime highs are 4°C warmer than August and about the same as October.
What stands out in September
- September brings early spring to Newcastle — the seasons are reversed south of the equator.
- Low humidity (around 47%) keeps the warmth pleasant rather than muggy.
- Evenings cool off sharply: the daily range is around 18°C, so pack a layer.
- Newcastle is usually about 2°C warmer than Pietermaritzburg, 210 km away, in September.
Avg high
28°C
82°F
Avg low
10°C
50°F
Rainfall
35 mm
fairly dry
Humidity
47%
relative
Sky
33%
cloud · mostly sunny
Newcastle weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 30°C / 86°F | 15°C / 60°F | 104 mm | 65% | 63% |
| February | 30°C / 85°F | 15°C / 59°F | 84 mm | 66% | 61% |
| March | 29°C / 83°F | 14°C / 57°F | 80 mm | 65% | 56% |
| April | 25°C / 77°F | 11°C / 51°F | 40 mm | 64% | 47% |
| May | 23°C / 74°F | 8°C / 47°F | 15 mm | 56% | 29% |
| June | 20°C / 69°F | 5°C / 41°F | 6 mm | 51% | 19% |
| July | 20°C / 68°F | 5°C / 40°F | 15 mm | 51% | 20% |
| August | 24°C / 75°F | 7°C / 44°F | 14 mm | 47% | 24% |
| September | 28°C / 82°F | 10°C / 50°F | 35 mm | 47% | 33% |
| October | 29°C / 84°F | 11°C / 53°F | 63 mm | 54% | 48% |
| November | 30°C / 86°F | 13°C / 55°F | 84 mm | 58% | 60% |
| December | 30°C / 87°F | 15°C / 59°F | 112 mm | 63% | 68% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
- Sunglasses
Is September a good time to visit Newcastle?
Compare the months in the chart above to find your ideal window.
Best time to visit Newcastle →Other South Africa cities in September
Cite or embed this data
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Newcastle weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/south-africa/newcastle-south-africa/september
<a href="https://weathercompare.eu/weather/south-africa/newcastle-south-africa/september">Newcastle weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/south-africa/newcastle-south-africa" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Newcastle weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/south-africa/newcastle-south-africa/september">Newcastle weather in September</a> – WeatherCompare</p>
Newcastle in September: quick answers
Is September a good time to visit Newcastle?
September is a reasonable time for Newcastle: highs around 28°C and about 35 mm of rain, though not one of the three best months.
How warm is Newcastle in September?
Average highs are about 28°C (82°F) and average lows about 10°C (50°F), based on 10 years of daily data.
Does it rain a lot in Newcastle in September?
Newcastle typically gets around 35 mm of rain in September — fairly dry.
Figures are long-term averages for the area around Newcastle (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.