Hillsboro weather by month
Average highs run from 47°F in January to 82°F in July, and January nights average 34°F. It gets 36 inches of rain and melted snow a year and 3 inches of snow. Nights drop below freezing about 64 times a year. The most comfortable months are May to September.
Best time to visit Hillsboro
For comfortable weather, go in May to September. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 47°F | 34°F | 5.3 in | 0.6 in | 12 | 0 | 13 | cold |
| February | 51°F | 34°F | 4.0 in | 0.6 in | 10 | 0 | 13 | cool |
| March | 56°F | 37°F | 3.7 in | 0.0 in | 11 | 0 | 9 | cool |
| April | 61°F | 39°F | 2.6 in | 0.0 in | 8 | 0 | 3 | cool |
| May | 69°F | 45°F | 2.0 in | 0.0 in | 6 | 0 | 1 | mild |
| June | 74°F | 49°F | 1.3 in | 0.0 in | 4 | 2 | 0 | mild |
| July | 82°F | 52°F | 0.4 in | 0.0 in | 1 | 6 | 0 | warm |
| August | 82°F | 52°F | 0.5 in | 0.0 in | 1 | 6 | 0 | warm |
| September | 76°F | 48°F | 1.4 in | 0.0 in | 3 | 2 | 0 | warm |
| October | 64°F | 41°F | 3.4 in | 0.2 in | 8 | 0 | 3 | mild days, chilly nights |
| November | 53°F | 37°F | 5.4 in | 0.0 in | 11 | 0 | 9 | cool |
| December | 46°F | 33°F | 6.1 in | 1.3 in | 13 | 0 | 14 | cold |
| Year | 63°F avg | 42°F avg | 35.9 in | 2.7 in | 88 | 17 | 64 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Portland-Hillsboro Airport, OR (USW00094261), 0.7 miles from the city center; snowfall from Forest Grove, OR. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Hillsboro
The shortest day is December 21, with 8h 41m of daylight; the longest is June 21, with 15h 41m. The earliest sunset comes around December 8 (4:27 pm) and the latest around June 21 (9:04 pm). The sun sets after 8 pm on 131 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:48 am | 4:54 pm | 9h 06m |
| February | 7:13 am | 5:38 pm | 10h 25m |
| March | 7:24 am | 7:17 pm | 11h 54m |
| April | 6:26 am | 7:58 pm | 13h 32m |
| May | 5:41 am | 8:35 pm | 14h 55m |
| June | 5:22 am | 9:02 pm | 15h 40m |
| July | 5:38 am | 8:57 pm | 15h 19m |
| August | 6:12 am | 8:18 pm | 14h 06m |
| September | 6:50 am | 7:22 pm | 12h 32m |
| October | 7:28 am | 6:25 pm | 10h 57m |
| November | 7:11 am | 4:40 pm | 9h 29m |
| December | 7:45 am | 4:28 pm | 8h 43m |
Calculated for 2026 at the center of Hillsboro with NOAA's solar equations, in local clock time (Pacific Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Hillsboro getting warmer?
The last 10 years averaged 1.9°F warmer than the 20th century. See the climate stripes for Hillsboro.Frequently asked questions
What is the warmest month in Hillsboro?
August is the warmest month, with an average high of 82°F and an average low of 52°F (NOAA 1991-2020 normals).
What is the coldest month in Hillsboro?
December is the coldest, with average lows of 33°F and highs of 46°F.
What is the rainiest month in Hillsboro?
December gets the most precipitation, 6.1 inches on average. July is the driest at 0.4 inches.
Does it snow in Hillsboro?
Yes. Hillsboro averages 3 inches of snow a year.
When is the best time to visit Hillsboro?
For comfortable weather, May to September. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Hillsboro?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Hillsboro profile.
Compare the weather: Hillsboro vs Beaverton, Hillsboro vs Portland, Hillsboro vs Vancouver, Hillsboro vs Gresham.