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October Weather in Mercersburg, United States

Last updated: June 24, 2025

In Mercersburg, United States, the average temperature in October is a mild 15°C (59°F). However, it's not uncommon for temperatures to dip as low as 0°C (32°F) or soar to 33°C (92°F). During this month, expect an average precipitation of 110 mm (4.3 in) over about 10 days, with humidity levels hovering around a comfortable 80%. Stay prepared for a mix of weather as you explore!

October Temperature in Mercersburg

In October in Mercersburg, the average temperature is 15°C (59°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 0°C (32°F). This makes it a perfect time to enjoy a variety of outdoor activities while being prepared for both warm and cooler conditions.

October Weather in Mercersburg: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Mercersburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mercersburg, October typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (92°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec333743546472787569594437
Data source: Temperature data for Mercersburg 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.

October Precipitation in Mercersburg

In Mercersburg in October, the precipitation amount is 110 mm (4.3 in) over a period of 10 days.

October Precipitation Trends in Mercersburg

The chart displays monthly precipitation patterns in Mercersburg, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Mercersburg, October typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6396871071261051301071221107696
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Mercersburg

In Mercersburg in October, humidity is 80%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making outdoor activities slightly uncomfortable and necessitating frequent breaks to stay hydrated.

October Average Humidity in Mercersburg

This chart illustrates the average monthly humidity levels in Mercersburg, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Mercersburg is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Mercersburg

In Mercersburg in October, 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 Mercersburg.

Maximum UV Index Levels in Mercersburg for October

The chart shows the monthly maximum UV Index (UVI) for Mercersburg in October, 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 October, the maximum UV index in Mercersburg typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098743
Data source: Mercersburg October 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 October Weather in Mercersburg Compares to Other Months

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

This table compares monthly weather conditions in Mercersburg, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)63 mm (2.5 inches)86%moderate
February Weather3°C (37°F)95 mm (3.8 inches)86%moderate
March Weather6°C (43°F)87 mm (3.4 inches)86%high
April Weather12°C (54°F)107 mm (4.2 inches)84%very high
May Weather18°C (64°F)126 mm (5.0 inches)78%very high
June Weather22°C (72°F)105 mm (4.1 inches)79%very high
July Weather25°C (78°F)130 mm (5.1 inches)70%very high
August Weather24°C (75°F)107 mm (4.2 inches)59%very high
September Weather21°C (69°F)122 mm (4.8 inches)68%very high
October Weather15°C (59°F)110 mm (4.3 inches)80%high
November Weather6°C (44°F)76 mm (3.0 inches)86%moderate
December Weather3°C (38°F)96 mm (3.8 inches)85%moderate

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