Hillsboro, OR weather in October
Hillsboro is cool in October, with frequent rain: highs average 63°F and nights drop to about 42°F. There are about 12 days with rain.
- Normal high
- 63°F
- Normal low
- 42°F
- Wet days
- 12
- 3.6 in total
- Muggy days
- 0
- dew point 65°F+
How October changes from start to finish
| October 1 | October 31 | |
|---|---|---|
| Normal high | 71°F | 56°F |
| Normal low | 45°F | 39°F |
| Chance of a wet day | 31% | 49% |
| Sunrise / sunset | 7:10 am / 6:52 pm | 7:50 am / 6:00 pm |
| Daylight | 11.7 h | 10.2 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical October day
- 6 am45°Fdew point 43°F
- 9 am51°Fdew point 46°F
- Noon59°Fdew point 47°F
- 3 pm62°Fdew point 46°F
- 6 pm57°Fdew point 47°F
- 9 pm51°Fdew point 46°F
NOAA hourly normals (local standard time) from Portland-Hillsboro Airport (2 mi away); average wind 4 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F13 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow12 of 31
- Notable rainat least 0.10 in8 of 31
- Freezing nightslow 32°F or below2 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per October, counted from daily records for each year 1991-2020.
Rain in October
Normal precipitation is 3.6 in; a dry October brings about 2.5 in and a wet one about 4.1 in (25th and 75th percentiles). About 2 days bring half an inch or more. Snow is very rare.
How October varies from year to year
- Warmest October, 1991-20201993: average high 71°F
- Coolest October2007: average high 60°F
- Wettest October2016: 11.5 in
- Driest October2002: 0.6 in
- Highest reading92°F (October 3, 1993)
- Lowest reading20°F (October 30, 2002)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
October compared with September and November
| September | October | November | |
|---|---|---|---|
| Normal high | 76°F | 63°F | 51°F |
| Normal low | 49°F | 42°F | 36°F |
| Wet days | 6 | 12 | 19 |
| Comfortable days | 16 | 13 | 1 |
| Daylight | 12.5 h | 10.9 h | 9.5 h |
Highs change by -13°F from September and -12°F into November.
Nearby alternatives in October
- Drier: Bend, OR130 mi · high 63°F · 4 wet days
- Cooler: Port Angeles, WA181 mi · high 57°F · 14 wet days
How Hillsboro ranks in October
- Normal high282nd warmest of 378 cities; 3rd of 6 in Oregon
- Wet days342nd driest of 378
- Comfortable days147th most of 340
What to pack for Hillsboro in October
- A rain jacket or umbrella – rain on about 12 days
Frost in October
The first fall frost typically comes around Oct 23; in 1 year in 10 it comes before Oct 3. All frost dates for Hillsboro.
Heating and cooling
October has 391 heating degree days and 2 cooling degree days (base 65°F), 7% of the year's total heating and cooling demand.
Questions
How cold is Hillsboro in October?
The normal high is 63°F and the normal low is 42°F. From 1991 to 2020 the coldest October reading was 20°F (October 30, 2002).
Does it rain a lot in Hillsboro in October?
About 12 days in October have at least 0.01 in of precipitation, and the normal total is 3.6 in. The wettest October in 1991-2020 was in 2016 (11.5 in); the driest was in 2002 (0.6 in).
Is October a good time to visit Hillsboro?
October ranks 7th of 12 months on our comfort score for Hillsboro (59 out of 100). It has about 13 comfortable days. The best month is June.
Where the numbers come from
- Temperature and snow depth: Forest Grove (USC00352997), 5.5 mi W of the city center, 180 ft . NOAA normals and daily records, 1991-2020.
- Rain and snowfall: Dilley 2 S (USC00352325), 7.3 mi SW of the city center, 194 ft . NOAA normals and daily records, 1991-2020.
- Frost dates and humidity and wind by hour: Portland-Hillsboro Airport (USW00094261), 2.3 mi ENE of the city center, 204 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Portland International Airport (726980-24229), 19 mi ENE of the city center, 22 ft (173 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).