nomadseason

September Weather in Lancaster, United States

Last updated: June 24, 2025

In Lancaster, United States during September, the average temperature hovers around 22°C (71°F), with pleasant lows of 8°C (47°F) and warm highs of 35°C (96°F). Expect a precipitation amount of 126 mm (4.9 in) spread over 9 days, contributing to an average humidity of 67%. It's a perfect time to explore the vibrant atmosphere while staying prepared for occasional rain!

September Temperature in Lancaster

In September in Lancaster, the average temperature is 22°C (71°F). Maximum temperatures can reach 35°C (96°F), while minimums can dip as low as 8°C (47°F). This mild climate makes Lancaster an ideal destination for travelers seeking comfortable weather and outdoor adventures.

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 22°C (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec374249566773777671614642
Data source: Temperature data for Lancaster generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 is 126 mm (4.9 in) spread over a duration of 9 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 126 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9716713613813515810211412611785140
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Lancaster

In Lancaster in September, humidity is 67%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet slightly uncomfortable, as the air hangs thick, reminding travelers to stay hydrated and seek shade during the midday sun.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109753
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 Weather3°C (37°F)97 mm (3.8 inches)88%moderate
February Weather6°C (42°F)167 mm (6.6 inches)88%high
March Weather9°C (49°F)136 mm (5.4 inches)87%high
April Weather13°C (56°F)138 mm (5.4 inches)84%very high
May Weather19°C (67°F)135 mm (5.3 inches)84%very high
June Weather23°C (73°F)158 mm (6.2 inches)83%extreme
July Weather25°C (78°F)102 mm (4.0 inches)79%extreme
August Weather24°C (76°F)114 mm (4.5 inches)66%very high
September Weather22°C (71°F)126 mm (4.9 inches)67%very high
October Weather16°C (61°F)117 mm (4.6 inches)76%high
November Weather8°C (46°F)85 mm (3.3 inches)89%moderate
December Weather5°C (42°F)140 mm (5.5 inches)88%moderate

Compare Lancaster's Climate with Cities Worldwide