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October Weather in Harlingen, United States

Last updated: June 24, 2025

In October, the average temperature in Harlingen, United States hovers around 25°C (77°F). Expect a minimum dip to 7°C (45°F), while the mercury can rise to a sweltering 37°C (98°F). With an average humidity of 76% and 64 mm (2.5 in) of precipitation spread across 9 days, be prepared for a mix of warmth and occasional showers!

October Temperature in Harlingen

In October in Harlingen, the average temperature is 25°C (77°F), with maximums reaching up to 37°C (98°F) and minimums dipping as low as 7°C (45°F). This climate makes Harlingen an ideal destination for travelers seeking warm weather with the flexibility to enjoy cooler evenings.

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

The chart illustrates October temperature patterns in Harlingen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harlingen, October typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (98°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec626572768284868783776964
Data source: Temperature data for Harlingen 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 Harlingen

In Harlingen in October, the precipitation amount is 64 mm (2.5 in) over a span of 9 days.

October Precipitation Trends in Harlingen

The chart displays monthly precipitation patterns in Harlingen, 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 Harlingen, October typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec2421353081919433114653023
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Harlingen

In Harlingen in October, humidity is 76%. With an average temperature of 25°C (77°F), this humidity feels like a warm, heavy blanket wrapping around you, making traveling feel muggy and requiring frequent breaks to stay refreshed.

October Average Humidity in Harlingen

This chart illustrates the average monthly humidity levels in Harlingen, 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 Harlingen is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Harlingen

In Harlingen in October, 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 Harlingen.

Maximum UV Index Levels in Harlingen for October

The chart shows the monthly maximum UV Index (UVI) for Harlingen 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 Harlingen typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69101112121212111076
Data source: Harlingen 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 Harlingen Compares to Other Months

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

This table compares monthly weather conditions in Harlingen, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (62°F)24 mm (1.0 inches)83%high
February Weather18°C (65°F)21 mm (0.8 inches)79%very high
March Weather22°C (72°F)35 mm (1.4 inches)76%very high
April Weather25°C (77°F)30 mm (1.2 inches)77%extreme
May Weather28°C (82°F)81 mm (3.2 inches)80%extreme
June Weather29°C (85°F)91 mm (3.6 inches)73%extreme
July Weather30°C (86°F)94 mm (3.7 inches)66%extreme
August Weather30°C (87°F)33 mm (1.3 inches)65%extreme
September Weather28°C (83°F)114 mm (4.5 inches)73%extreme
October Weather25°C (77°F)64 mm (2.5 inches)76%very high
November Weather21°C (69°F)30 mm (1.2 inches)80%high
December Weather18°C (65°F)23 mm (0.9 inches)86%high

Compare Harlingen's Climate with Cities Worldwide