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September Weather in Lancaster, United States

Last updated: June 24, 2025

In Lancaster, United States, the average temperature in September is a pleasant 23°C (74°F). However, temperatures can vary, dipping as low as 12°C (54°F) and peaking at a balmy 35°C (94°F). Visitors should prepare for some rain, as the area experiences approximately 117 mm (4.6 in) of precipitation over 11 days, accompanied by an average humidity of 78%.

September Temperature in Lancaster

In September in Lancaster, the average temperature is 23°C (74°F). The maximum can reach 35°C (94°F) and the minimum can be as low as 12°C (54°F). This pleasant temperature range makes it an ideal time for traveling and exploring the attractions in Lancaster.

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

The chart illustrates September temperature patterns in Lancaster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lancaster, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (94°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec404449586876817974655145
Data source: Temperature data for Lancaster 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 Lancaster

In Lancaster in September, the total precipitation amount reaches 117 mm (4.6 in) over the course of 11 days.

September Precipitation Trends in Lancaster

The chart displays monthly precipitation patterns in Lancaster, 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 Lancaster, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec7610592981001091331581171297997
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lancaster

In Lancaster in September humidity is 78%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace, making travel somewhat stifling and prompting frequent breaks to hydrate and seek shade.

September Average Humidity in Lancaster

This chart illustrates the average monthly humidity levels in Lancaster, 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 Lancaster is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%82%81%80%82%81%81%78%80%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lancaster

In Lancaster 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 Lancaster.

Maximum UV Index Levels in Lancaster for September

The chart shows the monthly maximum UV Index (UVI) for Lancaster 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 Lancaster typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
Data source: Lancaster 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 Lancaster Compares to Other Months

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

This table compares monthly weather conditions in Lancaster, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)76 mm (3.0 inches)84%moderate
February Weather7°C (44°F)105 mm (4.1 inches)83%moderate
March Weather9°C (49°F)92 mm (3.6 inches)82%high
April Weather15°C (59°F)97 mm (3.8 inches)81%very high
May Weather20°C (68°F)100 mm (3.9 inches)80%very high
June Weather24°C (76°F)109 mm (4.3 inches)82%very high
July Weather27°C (81°F)133 mm (5.2 inches)81%very high
August Weather26°C (79°F)158 mm (6.2 inches)81%very high
September Weather23°C (74°F)117 mm (4.6 inches)78%very high
October Weather18°C (65°F)129 mm (5.1 inches)80%high
November Weather11°C (51°F)79 mm (3.1 inches)84%moderate
December Weather7°C (45°F)96 mm (3.8 inches)84%moderate

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