Hillsboro
Oregon, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Hillsboro, OR

The red tree colors of the fall along a road and amid trees in this tranquil neighborhood in Hillsboro, Oregon, and even better in the sun rays
The red tree colors of the fall along a road and amid trees in this tranquil neighborhood in Hillsboro, Oregon, and even better in the sun rays
September, the first month of the autumn, in Hillsboro, is also a moderately hot month, with temperature in the range of an average high of 75.9°F (24.4°C) and an average low of 47.5°F (8.6°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still warm 75.9°F (24.4°C). The average low-temperature, in Hillsboro, is 47.5°F (8.6°C).

Rainfall

In Hillsboro, in September, during 7 rainfall days, 1.4" (36.3mm) of precipitation is typically accumulated. In Hillsboro, during the entire year, the rain falls for 151 days and collects up to 37.7" (958.6mm) of precipitation.

Daylight

In Hillsboro, the average length of the day in September is 12.5h.

What is the temperature in September in Hillsboro?

In September, in Hillsboro, the average high-temperature is 75.9°F (24.4°C), and the average low-temperature is 47.5°F (8.6°C).

How many days does it rain in September in Hillsboro?

In Hillsboro, in September, it is raining for 7 days, with typically 1.4" (36.3mm) of accumulated precipitation.

What is the average length of the day in September in Hillsboro?

In Hillsboro, the average length of the day in September is 12.5h.
Average temperature in September - Hillsboro, OR
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (45°F).

  • Average low temperature in September: 47.4°F

The month with the highest average low temperature is July (51.9°F).
The coldest month (with the lowest average low temperature) is January (32.7°F).

Average rainfall in September - Hillsboro, OR
  • Average rainfall in September: 1.4"

The wettest month (with the highest rainfall) is December (6.8").
The driest month (with the lowest rainfall) is July (0.5").

Average rainfall days in September - Hillsboro, OR
  • Average rainfall days in September: 7 days

Months with the highest number of rainy days are January and December (20 days).
The month with the lowest number of rainy days is July (3 days).

Average daylight in September - Hillsboro, OR
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).