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August Weather in Hillsboro, United States

Last updated: June 24, 2025

The average temperature in Hillsboro, United States during August is a pleasant 20°C (69°F). However, temperatures can fluctuate widely, with minimums dipping to 7°C (44°F) and maximums soaring to 35°C (96°F). Expect 85 mm (3.4 in) of precipitation spread over 9 days, contributing to an average humidity of 78%.

August Temperature in Hillsboro

In August in Hillsboro, the average temperature is 20°C (69°F). The maximum can reach 35°C (96°F), while the minimum can drop to as low as 7°C (44°F). Be sure to pack for a range of temperatures to fully enjoy your trip!

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 20°C (69°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec10927395669726860442817
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 total precipitation amount is 85 mm (3.4 in) recorded over a span of 9 days.

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 85 mm (3.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec182026435490608572802339
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 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%92%85%81%75%79%77%78%77%79%86%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec245789987432
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 Weather-12°C (10°F)18 mm (0.7 inches)90%low
February Weather-13°C (9°F)20 mm (0.8 inches)92%moderate
March Weather-3°C (27°F)26 mm (1.0 inches)85%moderate
April Weather4°C (40°F)43 mm (1.7 inches)81%high
May Weather13°C (57°F)54 mm (2.1 inches)75%very high
June Weather21°C (69°F)90 mm (3.5 inches)79%very high
July Weather22°C (73°F)60 mm (2.4 inches)76%very high
August Weather20°C (69°F)85 mm (3.4 inches)78%very high
September Weather16°C (60°F)72 mm (2.8 inches)77%high
October Weather7°C (44°F)80 mm (3.2 inches)79%moderate
November Weather-2°C (28°F)23 mm (0.9 inches)86%moderate
December Weather-8°C (18°F)39 mm (1.6 inches)86%low

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