Monthly climate guide
Newcastle weather in September
With highs near 20°C (69°F) and lows around 14°C (58°F), September feels mild in Newcastle. Rainfall averages about 45 mm (fairly dry) and the sky is a mix of sun and cloud. Daytime highs are 2°C warmer than August and 2°C cooler than October.
What stands out in September
- Skies are at their clearest this time of year.
- Just 360 km apart, but Newcastle runs about 5°C warmer than Canberra this month.
- Rain is well below Newcastle's usual level (around 43% less).
- September brings early spring to Newcastle — the seasons are reversed south of the equator.
Avg high
20°C
69°F
Avg low
14°C
58°F
Rainfall
45 mm
fairly dry
Humidity
67%
relative
Sky
39%
cloud · a mix of sun and cloud
Newcastle weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 27°C / 80°F | 21°C / 70°F | 102 mm | 74% | 56% |
| February | 26°C / 79°F | 21°C / 70°F | 126 mm | 75% | 56% |
| March | 25°C / 77°F | 20°C / 69°F | 123 mm | 76% | 56% |
| April | 23°C / 73°F | 18°C / 65°F | 85 mm | 74% | 49% |
| May | 20°C / 68°F | 15°C / 59°F | 43 mm | 71% | 43% |
| June | 18°C / 64°F | 14°C / 56°F | 89 mm | 75% | 51% |
| July | 17°C / 63°F | 12°C / 54°F | 47 mm | 71% | 40% |
| August | 18°C / 64°F | 12°C / 54°F | 48 mm | 68% | 37% |
| September | 20°C / 69°F | 14°C / 58°F | 45 mm | 67% | 39% |
| October | 23°C / 73°F | 16°C / 61°F | 67 mm | 69% | 49% |
| November | 24°C / 75°F | 18°C / 64°F | 85 mm | 71% | 55% |
| December | 25°C / 78°F | 20°C / 67°F | 84 mm | 72% | 58% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- 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 Australia 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/australia/newcastle/september
<a href="https://weathercompare.eu/weather/australia/newcastle/september">Newcastle weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/australia/newcastle" 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/australia/newcastle/september">Newcastle weather in September</a> – WeatherCompare</p>
Newcastle in September: quick answers
Is September a good time to visit Newcastle?
Yes. September is one of the best months for Newcastle, with highs around 20°C and about 45 mm of rain.
How warm is Newcastle in September?
Average highs are about 20°C (69°F) and average lows about 14°C (58°F), based on 10 years of daily data.
Does it rain a lot in Newcastle in September?
Newcastle typically gets around 45 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.