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September Weather in Newcastle, United States

Last updated: June 24, 2025

In Newcastle, United States, the average temperature in September is a comfortable 16°C (62°F). You'll experience a minimum of 8°C (46°F) and can enjoy highs of 30°C (86°F). Expect 100 mm (3.9 in) of precipitation spread over 12 days, and stay refreshed with an average humidity of 62%.

September Temperature in Newcastle

In September in Newcastle, the average temperature is 16°C (62°F). Maximums can reach 30°C (86°F), while minimums can drop to as low as 8°C (46°F). This makes it an ideal time for travelers to explore the outdoors, enjoying a pleasant climate for various activities.

September Weather in Newcastle: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Newcastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newcastle, September typically has an average temperature of 16°C (62°F), with highs reaching up to 30°C (86°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec424145505762666762524742
Data source: Temperature data for Newcastle generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Newcastle

In Newcastle in September, the precipitation amount is 100 mm (3.9 in) over the course of 12 days.

September Precipitation Trends in Newcastle

The chart displays monthly precipitation patterns in Newcastle, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Newcastle, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec17517712611768631916100155181196
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Newcastle

In Newcastle in September, humidity is 62%. With an average temperature of 16°C (62°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities a bit sticky but still comfortable if you plan to explore at a leisurely pace.

September Average Humidity in Newcastle

This chart illustrates the average monthly humidity levels in Newcastle, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Newcastle is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Newcastle

In Newcastle in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Newcastle.

Maximum UV Index Levels in Newcastle for September

The chart shows the monthly maximum UV Index (UVI) for Newcastle in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Newcastle typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987521
Data source: Newcastle September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Newcastle Compares to Other Months

Weather in Newcastle varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Newcastle, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Newcastle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)175 mm (6.9 inches)86%low
February Weather5°C (41°F)177 mm (7.0 inches)86%moderate
March Weather7°C (46°F)126 mm (4.9 inches)87%moderate
April Weather10°C (50°F)117 mm (4.6 inches)84%high
May Weather14°C (57°F)68 mm (2.7 inches)81%very high
June Weather17°C (62°F)63 mm (2.5 inches)82%very high
July Weather19°C (67°F)18 mm (0.7 inches)79%very high
August Weather19°C (67°F)16 mm (0.6 inches)63%very high
September Weather16°C (62°F)100 mm (3.9 inches)62%high
October Weather11°C (52°F)155 mm (6.1 inches)83%moderate
November Weather8°C (47°F)181 mm (7.1 inches)89%low
December Weather6°C (42°F)196 mm (7.7 inches)88%low

Compare Newcastle's Climate with Cities Worldwide