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August Weather in Hillsboro, United States

Last updated: June 24, 2025

In August, the average temperature in Hillsboro, United States hovers around 21°C (70°F), making it a pleasant time to visit. However, be prepared for a significant range, as temperatures can dip to a low of 9°C (48°F) or soar to a high of 39°C (103°F). You can expect 6 mm (0.2 in) of rain over approximately 1 day, contributing to an average humidity of 74%.

August Temperature in Hillsboro

In August in Hillsboro, the average temperature is 21°C (70°F). Maximums can reach 39°C (103°F), while minimums can drop as low as 9°C (48°F). This diverse temperature range makes Hillsboro an ideal destination for travelers seeking both warm days and cooler evenings.

August Weather in Hillsboro: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Hillsboro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hillsboro, August typically has an average temperature of 21°C (70°F), with highs reaching up to 39°C (103°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec414145515763687063534641
Data source: Temperature data for Hillsboro 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.

August Precipitation in Hillsboro

In Hillsboro in August, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.

August Precipitation Trends in Hillsboro

The chart displays monthly precipitation patterns in Hillsboro, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Hillsboro, August typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec17316613211555476666101163188
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Hillsboro

In Hillsboro in August humidity is 74%. With an average temperature of 21°C (70°F), this humidity feels like a warm, moist embrace, making outdoor activities both invigorating and slightly draining, so travelers should stay hydrated and take breaks often.

August Average Humidity in Hillsboro

This chart illustrates the average monthly humidity levels in Hillsboro, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Hillsboro is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Hillsboro

In Hillsboro in August, 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 Hillsboro.

Maximum UV Index Levels in Hillsboro for August

The chart shows the monthly maximum UV Index (UVI) for Hillsboro in August, 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 August, the maximum UV index in Hillsboro typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23579101087532
Data source: Hillsboro August 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 August Weather in Hillsboro Compares to Other Months

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

This table compares monthly weather conditions in Hillsboro, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)173 mm (6.8 inches)85%low
February Weather5°C (41°F)166 mm (6.5 inches)84%moderate
March Weather7°C (46°F)132 mm (5.2 inches)85%moderate
April Weather10°C (51°F)115 mm (4.5 inches)83%high
May Weather14°C (58°F)55 mm (2.2 inches)83%very high
June Weather17°C (64°F)47 mm (1.9 inches)83%very high
July Weather20°C (69°F)5 mm (0.2 inches)82%very high
August Weather21°C (70°F)6 mm (0.2 inches)74%very high
September Weather17°C (64°F)66 mm (2.6 inches)71%high
October Weather11°C (53°F)101 mm (4.0 inches)81%moderate
November Weather8°C (46°F)163 mm (6.4 inches)87%moderate
December Weather5°C (41°F)188 mm (7.4 inches)87%low

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