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September Weather in Lancaster, United States

Last updated: June 24, 2025

In Lancaster, United States, the average temperature in September hovers around 26°C (80°F). Expect a minimum temperature of 11°C (52°F) and a maximum soaring to 38°C (101°F). This month witnesses approximately 88 mm (3.5 in) of precipitation spread over 9 days, complemented by an average humidity of 65%.

September Temperature in Lancaster

In September in Lancaster, the average temperature is 26°C (80°F), with maximums reaching 38°C (101°F) and minimums dipping as low as 11°C (52°F). Be prepared for warm days, but also bring layers for cooler evenings.

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 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec485061667582858580685752
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 precipitation amount is 88 mm (3.5 in) over the course 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 88 mm (3.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec64101100130178975892881455368
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 65%. With an average temperature of 26°C (80°F), this humidity feels like a warm, sticky embrace, making travel less comfortable as you navigate the sights.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
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 Weather9°C (48°F)64 mm (2.5 inches)80%moderate
February Weather10°C (50°F)101 mm (4.0 inches)79%high
March Weather16°C (61°F)100 mm (3.9 inches)78%very high
April Weather19°C (66°F)130 mm (5.1 inches)78%very high
May Weather24°C (75°F)178 mm (7.0 inches)81%extreme
June Weather28°C (82°F)97 mm (3.8 inches)78%extreme
July Weather30°C (85°F)58 mm (2.3 inches)73%extreme
August Weather29°C (85°F)92 mm (3.6 inches)66%extreme
September Weather26°C (80°F)88 mm (3.5 inches)65%very high
October Weather20°C (69°F)145 mm (5.7 inches)72%very high
November Weather14°C (57°F)53 mm (2.1 inches)82%high
December Weather11°C (53°F)68 mm (2.7 inches)87%moderate

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