The climate of Hillsboro
Marking its presence in the state of
Oregon, USA,
Hillsboro has been designated with the Csb, Mediterranean warm climate according to the Köppen climate classification. This city experiences warm summers and temperatures that remain moderate throughout the year. The annual humidity remains stable at around 70%, contributing to a climate that varies but manages to avoid extremes.
A discernible fluctuation can be observed in the temperature readings, from an absolute minimum of 34°F (1.1°C) in the month of
January to a zenith of 81.5°F (27.5°C) in
August. It should be noted that the mercury remains relatively consistent between
May and
September, with minor variations. In addition to this, the rainfall pattern reflects a certain consistency, with most precipitation taking place in the winter months, especially from
November to January, with an apex of 4.57" (116mm) in January. The summer months of
July and August bear the brunt of the dry weather with an average rainfall of 0.39" (10mm) and 0.31" (8mm), respectively.
As far as the sunshine index is concerned, the months from May to August clock in the most sunlight hours, with July leading the roster with 15.3 hours. Decreasing daylight hours can be observed from September, reaching the lowest point in
December with 8.8 hours. In tune with the Mediterranean climate type, Hillsboro also experiences a spike in UV index during the summer months, peaking at a value of 6 in July.
The best time to visit Hillsboro
Considering the temperature and rainfall, the summer months from
June through
August would be an idyllic time to plan a visit to
Hillsboro. The mercury remains in the comfortable 70s°F and the rainfall is at its lowest during the year. These months offer maximum daylight hours and a significant amount of sunlight. The UV index also reaches its peak during these months, sitting at a value of 5 in June and stretching up to 6 in
July, so sun protection measures would be advisable.
The worst time to visit Hillsboro
On the flip side, the winter months from
November to
January are characterized by relatively low temperatures, sometimes dipping down to 34°F (1.1°C) in January. In addition, these months witness the highest rainfall, often reaching over 4" (102mm) in January. Also, these months administer less sunshine with shorter daylight hours and a low UV index that hovers from 2 to 3. As such, these months might not be the most suitable for outdoor activities or travel.
Spring weather in Hillsboro
Settings change as
Hillsboro steps into spring during the months from
March to
May. Temperature rises gradually from 52.2°F (11.2°C) in March to 67.1°F (19.5°C) in May. The city receives a moderate amount of rainfall in spring, marking slight increases each month from 3.35" (85mm) in March to 1.73" (44mm) in May. Days grow longer as well, with daylight hours stretching from 12 hours in March to nearly 15 hours in May.
Summer weather in Hillsboro
Summer in
Hillsboro, spanning from
June to
August, presents warm temperatures, hovering from 72.7°F (22.6°C) in June to a peak of 81.5°F (27.5°C) in August. It is the driest season of the year with rainfall measures at their lowest; 1.1" (28mm) in June rounding off to a mere 0.31" (8mm) in August. The longest days of the year occur in this season, with sunlight spanning 15.6 hours in June and decreasing slightly to 14.1 hours by August.
Autumn weather in Hillsboro
Entering the autumn months between
September and
November,
Hillsboro experiences a gradual drop in temperatures with a significant increase in rainfall. The temperature decreases from 73.9°F (23.3°C) in September to 50.7°F (10.4°C) in November. Rainfall ascends from 1.46" (37mm) in September to a heftier 3.19" (81mm) in November, indicating a shift in climate. However, the daylight hours decrease from 12.5 hours in September to 9.5 hours in November.
Winter weather in Hillsboro
The winter months of
December to
February are characterized by the lowest temperatures and the highest rainfall of the year. Temperatures plummet to a minimum of 34°F (1.1°C) in
January and the rainfall maxes at 4.57" (116mm) in December. Daylight is at a premium during these months, with an average of only 9.2 hours in December shrinking to 8.8 hours in February. Consequently, the UV index drops to a minimum value of 2 during these months, showing a stark decrease in intensity from the summer months.
Weather in January
January temperatures in
Hillsboro,
Oregon set the tone for the year with cold highs averaging around 45.3°F (7.4°C) and the lowest typically registering at 34.7°F (1.5°C). The city has a predominantly cloud-filled sky, with humidity at its peak, leading to frequent rainfall.
Weather in January » Weather in February
In
February,
Hillsboro's weather continues the pattern set in
January, albeit with a slight increase in temperatures to nearly 47.3°F (8.5°C). Although the crispness in the air and the reduced cloudiness give an impression of spring's arrival, rain remains a constant companion in this month.
Weather in February »Weather in March
March officially marks the onset of spring in
Hillsboro, accompanied by mild temperatures, with an average high of nearly 52.2°F (11.2°C). Relatively longer, brighter days can be expected with a dip in cloud coverage, while glimpses of blue skies are abundant.
Weather in March »
Weather in April
In
April,
Hillsboro heralds a significant transition from the clammy weather to the delightful freshness of spring with temperatures rising up to 58.3°F (14.6°C). The rising warmth, along with visibly reduced rain and snow, predicts the onset of summer.
Weather in April »Weather in May
May in
Hillsboro sees a marked decrease in cloud cover and allows residents to enjoy the sun for an average of 8.3 hours a day. The warmth signifies the transition from spring to summer, driving greenery to flourish, contrasting beautifully with the clear blue skies.
Weather in May » Weather in June
June greets
Hillsboro with the arrival of summer, with temperatures that can soar up to 72.7°F (22.6°C). This relatively drier month features clearer skies and longer daylight hours, casting a warm, inviting hue over the city. Notably, the rainfall dramatically drops from
May's figures, with precipitation even more infrequent.
Weather in June »
Weather in July
As the warmest month in
Hillsboro,
July showcases peak summer with an average high temperature reaching as much as 80.6°F (27°C), reflective of the city's moderate summer weather. Humidity is relatively low, and the frequency of rainfall reaches its annual low.
Weather in July »Weather in August
August extends
Hillsboro’s warm temperatures, from
July, with high averages around 81.5°F (27.5°C). However, the dryness in the atmosphere begins to give way to increasing humidity. The rain remains rare as cloudy days become slightly more frequent compared to July, but sunshine still prevails.
Weather in August » Weather in September
September represents a noticeable transitional weather phase in
Hillsboro with temperatures beginning to cool, falling to an average high of around 73.9°F (23.3°C). The receding summer heat and the early onset of fall create a comfortable environment, allowing flora and fauna to thrive.
Weather in September »
Weather in October
October welcomes the vibrant fall with a sharp drop in temperatures, declining to a high ambient of approximately 61.2°F (16.2°C). As the landscape changes its color palette from lush greens to warm autumn hues, rainfall becomes more frequent, setting the stage for the forthcoming wet season.
Weather in October » Weather in November
In
November,
Hillsboro witnesses the onset of winter with the rapid drop in temperature to an average maximum of around 50.7°F (10.4°C). With reduced sunshine hours, the skies are often cloudy, adding to the wintery feel. The noticeable increase in humidity combined with frequent rains echoes the introduction of the colder season.
Weather in November »Weather in December
December brings the full force of winter to
Hillsboro with an average high temperature of about 43.9°F (6.6°C) and an increase in rainfall to 4.45" (113mm) on average. The dwindling daylight hours, coupled with often cloudy skies and relatively high humidity, underline the chill factor.
Weather in December »