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September Weather in Newcastle, United States

Last updated: June 24, 2025

In Newcastle, United States, the average temperature in September hovers around 17°C (63°F). However, be prepared for a wide range, with minimums dipping to -1°C (31°F) and maximums soaring up to 39°C (102°F). This month sees about 30 mm (1.2 in) of precipitation over 5 days and an average humidity of 76%, making it a unique blend of conditions to experience.

September Temperature in Newcastle

In September in Newcastle, the average temperature is 17°C (63°F). Maximums can reach 39°C (102°F), while minimums can drop to as low as -1°C (31°F). Be prepared for a wide range of temperatures and pack accordingly when visiting during this month.

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 17°C (63°F), with highs reaching up to 39°C (102°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec252237435468747163443627
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 30 mm (1.2 in) over the course of 5 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 30 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec152431466434473130401924
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 76%. With an average temperature of 17°C (63°F), this humidity feels like traveling through a warm, enveloping blanket, making every outdoor adventure feel sticky and heavy, yet pleasantly refreshing when you find a cool breeze.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%78%64%66%74%84%85%85%76%71%73%75%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3561091111108642
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 Weather-4°C (25°F)15 mm (0.6 inches)73%moderate
February Weather-6°C (22°F)24 mm (1.0 inches)78%moderate
March Weather3°C (37°F)31 mm (1.2 inches)64%high
April Weather6°C (43°F)46 mm (1.8 inches)66%very high
May Weather12°C (54°F)63 mm (2.5 inches)74%very high
June Weather20°C (68°F)34 mm (1.3 inches)84%extreme
July Weather24°C (75°F)47 mm (1.8 inches)85%extreme
August Weather22°C (71°F)31 mm (1.2 inches)85%very high
September Weather17°C (63°F)30 mm (1.2 inches)76%very high
October Weather7°C (44°F)40 mm (1.6 inches)71%high
November Weather2°C (36°F)19 mm (0.8 inches)73%moderate
December Weather-3°C (27°F)24 mm (0.9 inches)75%low

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