Newcastle weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: August – May
What is the weather like in Newcastle in September?
In September, Newcastle is mild: daytime highs average 21 °C, and nights cool down to about 13 °C. The sea averages 18.5 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain falls on about 6 days, adding up to 40 mm. All in all, September is an excellent month for a holiday in Newcastle.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 89 | 92 | 87 |
| Day | 18° | 21° | 23° |
| Night | 10° | 13° | 15° |
| Sea | 18° | 19° | 19° |
| Sun | 8 h | 8 h | 8 h |
| Rain days | 7 | 6 | 8 |
More details for September
- Daylight
- 11 h 51 min05:53 – 17:44
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 36 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+10Australia/Sydney
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %83 %
- Few rainy daysweight 30 %83 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Newcastle in September: quick answers
Is Newcastle hot in September?
No. In September, Newcastle is mild: daytime highs average 21 °C and nights drop to about 13 °C.
Can you swim in Newcastle in September?
Only if you don't mind cold water: in September the sea averages just 18.5 °C. Comfortable swimming is possible from November to May.
Does it rain much in Newcastle in September?
Rain falls on about 6 days, adding up to 40 mm.
Newcastle month by month
The whole year in NewcastleAll destinations: AustraliaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences