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August Weather in Portland, United Kingdom

Last updated: August 27, 2025

In August, the average temperature in Portland, United Kingdom hovers around 17°C (63°F), making it a pleasantly mild destination. Expect minimum temperatures to dip to 12°C (53°F) and rise to comfortable highs of 26°C (78°F). However, be prepared for some rain, as 77 mm (3.0 in) of precipitation may fall over the course of 11 days. With an average humidity of 73%, it's advisable to pack for both warmth and moisture!

August Temperature in Portland

In August in Portland, the average temperature is 17°C (63°F). Maximum temperatures can reach 26°C (78°F), while minimums can drop as low as 12°C (53°F). This makes it an ideal time for travelers to enjoy comfortable weather and explore the attractions without extreme heat.

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

The chart illustrates August temperature patterns in Portland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portland, August typically has an average temperature of 17°C (63°F), with highs reaching up to 26°C (78°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec464647495358626261575148
Data source: Temperature data for Portland 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 Portland

In Portland in August, the precipitation amount is 77 mm (3.0 in) over the course of 11 days.

August Precipitation Trends in Portland

The chart displays monthly precipitation patterns in Portland, 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 Portland, August typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec758382416874507758144108136
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Portland

In Portland in August humidity is 73%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making it ideal for leisurely strolling through vibrant markets or exploring outdoor attractions, though travelers may want to stay hydrated and take breaks in shaded areas to fully enjoy the atmosphere.

August Average Humidity in Portland

This chart illustrates the average monthly humidity levels in Portland, 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 Portland is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Portland

In Portland in August, 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 Portland.

Maximum UV Index Levels in Portland for August

The chart shows the monthly maximum UV Index (UVI) for Portland 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 Portland typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234679876421
Data source: Portland 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 Portland Compares to Other Months

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

This table compares monthly weather conditions in Portland, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)74 mm (2.9 inches)88%low
February Weather8°C (46°F)83 mm (3.3 inches)88%moderate
March Weather8°C (47°F)82 mm (3.2 inches)86%moderate
April Weather9°C (49°F)41 mm (1.6 inches)84%high
May Weather12°C (54°F)68 mm (2.7 inches)80%high
June Weather15°C (59°F)74 mm (2.9 inches)80%very high
July Weather17°C (62°F)50 mm (2.0 inches)70%very high
August Weather17°C (63°F)77 mm (3.0 inches)73%high
September Weather16°C (61°F)58 mm (2.3 inches)79%high
October Weather14°C (57°F)144 mm (5.7 inches)89%moderate
November Weather11°C (51°F)107 mm (4.2 inches)90%low
December Weather9°C (49°F)136 mm (5.4 inches)89%low

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