Hillsboro (OR) Weather and Climate: A Comprehensive Guide
The temperature in Hillsboro can vary quite a bit throughout the year.
Temperatures can be warm during the warmest months,
and cold during the cooler months.
It receives a reasonable amount of rain/snowfall.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
Visitors to Hillsboro can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 28°C in August. In December, the coolest month of the year, temperatures drop to a chilly 7°C.
At night, you can expect cooler temperatures, with averages dropping to around 1°C during this month. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Generally, Hillsboro experiences moderate precipitation patterns, averaging 963 mm yearly. Hillsboro can be quite wet during December, receiving approximately 185 mm of precipitation over 22 rainy days. In contrast July, experiences much drier conditions, with 8.8 mm of rainfall, spread across 4 rainy days. For more details, please visit our Hillsboro Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Hillsboro can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 11.1 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 2.1 hours of sunlight per day. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Average humidity
The relative humidity is high throughout the year in Hillsboro.
The city experiences its highest humidity in December, reaching 83%. In July, the humidity drops to its lowest level at 63%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
broken clouds and rain overcast and heavy rain broken clouds and slight rainForecast for Hillsboro (OR)
4 m/s
3 m/s
3 m/s
The best time of year to visit Hillsboro in the United States of America
During the months of June and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Most rainfall (rainy season) is seen in November and December.
Yes, the months of July and August are very dry.
August has an average maximum temperature of 28°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 7°C.
December tops the wettest month list with 185 mm of rainfall.
July is the driest month with 9 mm of precipitation.
July is the sunniest month with an average of 332 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
