Hillsboro, OR Weather & Climate Normals
What a normal year in Hillsboro actually looks like
On the 30-year record NOAA keeps for Hillsboro, OR, the comfort score comes out to 56/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Hillsboro's weather actually swings
Average temperatures in Hillsboro run from 40°F in Dec up to 67°F in Jul, a 27.4°F seasonal swing, a middling gap by national standards.
Hillsboro, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 47°F | 34°F | 5.27in |
| Feb | 51°F | 34°F | 3.97in |
| Mar | 56°F | 37°F | 3.7in |
| Apr | 61°F | 39°F | 2.57in |
| May | 69°F | 45°F | 2.02in |
| Jun | 74°F | 49°F | 1.31in |
| Jul | 82°F | 52°F | 0.37in |
| Aug | 82°F | 52°F | 0.48in |
| Sep | 76°F | 48°F | 1.38in |
| Oct | 64°F | 41°F | 3.37in |
| Nov | 53°F | 37°F | 5.44in |
| Dec | 46°F | 33°F | 6.05in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Hillsboro's mildest stretch; if you're moving there, you should plan around Dec's cold instead.
How wet Hillsboro actually gets
Hillsboro averages 35.93in of precipitation a year across roughly 159 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Hillsboro against the rest of the country
Out of 4876 cities scored here, Hillsboro comes in at 725; within OR alone it ranks 17 of 80. Population is about 110,337.
Checking the actual forecast
These figures come from Portland-Hillsboro Ap, OR US, the NOAA station 1.1 miles from Hillsboro, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · Why this uses the nearest NOAA station