Frost Advisory
Ends in 4 h 51 min
When
For the first Frost Advisory, until 9 AM PDT Friday. For the second Frost Advisory, from 11 PM Friday to 9 AM PDT Saturday.
Where
In Oregon, Tualatin Valley, Central Oregon Coast Range, and Central Oregon Coast Range Lowlands. In Washington, Cowlitz County Lowlands, North Clark County Lowlands, South Washington Cascade Foothills, and Willapa Hills.
Issued for this forecast zone · National Weather Service Portland OR
What, impacts and precautionsHide details
What
For the first Frost Advisory, temperatures of 33 to 36 degrees will result in frost formation. For the second Frost Advisory, temperatures of 33 to 36 degrees will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender outdoor plants from the cold. Consider temporarily moving outdoor potted plants indoors if they are sensitive to cold temperatures, or temporarily covering sensitive plants with a lightweight cotton fabric (i.e., bedsheets, thin blankets), as this will help retain heat and provide frost protection for your plants.
Areas: Central Oregon Coast Range Lowlands; Central Oregon Coast Range; Tualatin Valley; Willapa Hills; Cowlitz County Lowlands; North Clark County Lowlands; South Washington Cascade Foothills
See it on weather.gov (opens in a new tab)
Frost Advisory
Starts in 18 h 51 min
When
For the first Frost Advisory, until 9 AM PDT Friday. For the second Frost Advisory, from 11 PM Friday to 9 AM PDT Saturday.
Where
In Oregon, Tualatin Valley, Central Oregon Coast Range, and Central Oregon Coast Range Lowlands. In Washington, Cowlitz County Lowlands, North Clark County Lowlands, South Washington Cascade Foothills, and Willapa Hills.
Issued for this forecast zone · National Weather Service Portland OR
What, impacts and precautionsHide details
What
For the first Frost Advisory, temperatures of 33 to 36 degrees will result in frost formation. For the second Frost Advisory, temperatures of 33 to 36 degrees will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender outdoor plants from the cold. Consider temporarily moving outdoor potted plants indoors if they are sensitive to cold temperatures, or temporarily covering sensitive plants with a lightweight cotton fabric (i.e., bedsheets, thin blankets), as this will help retain heat and provide frost protection for your plants.
Areas: Central Oregon Coast Range Lowlands; Central Oregon Coast Range; Tualatin Valley; Willapa Hills; Cowlitz County Lowlands; North Clark County Lowlands; South Washington Cascade Foothills
See it on weather.gov (opens in a new tab)

Observed 3:30 AM PDT at KVUO

Hillsboro, OR weather

Partly cloudy and 43°6°.

Mostly agree

Now 43°6°

Partly cloudy

Wind: Calm; Light through 4 PM
Dew point: 39°4°; Comfortable
UV tomorrow: 3Moderate; Moderate 1–3 PM · peak 3
Air quality: 28Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.19 inHg1022 hPa; Rising · +0.05 inHg+1.5 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 38°3° today at 7 AM
Above 50°10° today by 11 AM
High 61°16° today at 4 PM
Below 50°10° tonight after 8 PM
Fog tonight 3–10 AM

TonightNear 41°5° · Clear
This morningUp to 52°11° by 11 AM · Clear
This afternoonUp to 61°16° by 4 PM · Clear
TonightDown to 37°3° by 4 AM · Partly cloudy
Tomorrow morningUp to 49°9° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 62°17° by 4 PM · Mostly cloudy
Tomorrow nightDown to 42°6° by 3 AM · rain chance 20% · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Fri 4a	Clear	41°5° (likely 40°4° to 45°7°)	41°5°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	95%	7%	0
Fri 5a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	98%	7%	0
Fri 6a	Clear	39°4° (likely 38°3° to 42°6°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	98%	11%	0
Fri 7a	Clear	38°3° (likely 37°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	13%	0
Fri 8a	Sunny	38°3° (likely 37°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	15%	0
Fri 9a	Sunny	40°4° (likely 40°4° to 44°7°)	40°4°	0%	0 mph0 km/h, gusts 3 mph6 km/h	97%	12%	0
Fri 10a	Sunny	47°8° (likely 47°8° to 49°9°)	47°8°	0%	0 mph0 km/h, gusts 3 mph4 km/h	85%	15%	1
Fri 11a	Sunny	52°11° (likely 52°11° to 53°12°)	52°11°	0%	0 mph0 km/h, gusts 5 mph9 km/h	74%	15%	1
Fri 12p	Mostly sunny	55°13° (likely 55°13° to 56°13°)	55°13°	0%	0 mph0 km/h, gusts 6 mph9 km/h	64%	14%	2
Fri 1p	Mostly sunny	58°14° (likely 56°13° to 59°15°)	58°14°	0%	0 mph0 km/h, gusts 7 mph11 km/h	58%	18%	2
Fri 2p	Mostly sunny	60°16° (likely 57°14° to 61°16°)	60°16°	0%	0 mph0 km/h, gusts 8 mph12 km/h	52%	24%	2
Fri 3p	Mostly sunny	60°16° (likely 58°14° to 62°17°)	60°16°	0%	1 mph2 km/h from NNW, gusts 7 mph11 km/h	49%	25%	2
Fri 4p	Mostly sunny	61°16° (likely 57°14° to 63°17°)	61°16°	0%	1 mph2 km/h from NNW, gusts 6 mph10 km/h	47%	22%	1
Fri 5p	Mostly sunny	60°16° (likely 57°14° to 62°17°)	60°16°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	47%	20%	1
Fri 6p	Mostly clear	57°14° (likely 54°12° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	54%	26%	0
Fri 7p	Partly cloudy	54°12° (likely 51°11° to 54°12°)	54°12°	0%	0 mph0 km/h, gusts 3 mph4 km/h	63%	40%	0
Fri 8p	Cloudy	49°9° (likely 49°9° to 51°11°)	49°9°	0%	0 mph0 km/h, gusts 4 mph7 km/h	73%	85%	0
Fri 9p	Partly cloudy	47°8° (likely 47°8° to 48°9°)	47°8°	0%	0 mph0 km/h, gusts 5 mph8 km/h	80%	82%	0
Fri 10p	Cloudy	45°7° (likely 45°7° to 46°8°)	45°7°	0%	0 mph0 km/h, gusts 6 mph9 km/h	84%	73%	0
Fri 11p	Mostly clear	44°7° (likely 43°6° to 45°7°)	44°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	88%	54%	0
Sat 12a	Partly cloudy	43°6° (likely 41°5° to 43°6°)	43°6°	0%	0 mph0 km/h, gusts 4 mph7 km/h	90%	55%	0
Sat 1a	Partly cloudy	41°5° (likely 40°4° to 42°6°)	41°5°	0%	0 mph0 km/h, gusts 4 mph6 km/h	93%	45%	0
Sat 2a	Cloudy	40°4° (likely 39°4° to 41°5°)	40°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	67%	0
Sat 3a	Fog	39°4° (likely 38°3° to 41°5°)	39°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	98%	71%	0
Sat 4a	Fog	37°3° (likely 37°3° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	99%	56%	0
Sat 5a	Fog	37°3° (likely 37°3° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	58%	0
Sat 6a	Fog	37°3° (likely 36°2° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 1 mph2 km/h	100%	70%	0
Sat 7a	Fog	36°2° (likely 35°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	81%	0
Sat 8a	Fog	36°2° (likely 35°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	80%	0
Sat 9a	Fog	38°3° (likely 38°3° to 42°6°)	38°3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	97%	76%	0
Sat 10a	Cloudy	45°7° (likely 43°6° to 46°8°)	45°7°	0%	0 mph0 km/h, gusts 2 mph4 km/h	88%	65%	1
Sat 11a	Cloudy	49°9° (likely 46°8° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 2 mph4 km/h	77%	82%	2
Sat 12p	Cloudy	53°12° (likely 49°9° to 57°14°)	53°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	67%	81%	2
Sat 1p	Cloudy	57°14° (likely 53°12° to 61°16°)	57°14°	0%	0 mph0 km/h, gusts 2 mph3 km/h	59%	82%	3
Sat 2p	Cloudy	60°16° (likely 55°13° to 63°17°)	60°16°	0%	0 mph0 km/h, gusts 2 mph4 km/h	51%	83%	3
Sat 3p	Cloudy	60°16° (likely 56°13° to 64°18°)	60°16°	0%	0 mph0 km/h, gusts 4 mph7 km/h	47%	86%	2
Sat 4p	Cloudy	62°17° (likely 56°13° to 65°18°)	62°17°	0%	0 mph0 km/h, gusts 4 mph7 km/h	46%	82%	2
Sat 5p	Cloudy	60°16° (likely 56°13° to 64°18°)	60°16°	0%	0 mph0 km/h, gusts 4 mph6 km/h	46%	81%	1
Sat 6p	Cloudy	58°14° (likely 56°13° to 59°15°)	58°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	51%	81%	0
Sat 7p	Cloudy	54°12° (likely 53°12° to 54°12°)	54°12°	0%	0 mph0 km/h, gusts 6 mph9 km/h	60%	81%	0
Sat 8p	Cloudy	50°10° (likely 50°10° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 6 mph9 km/h	68%	80%	0
Sat 9p	Cloudy	48°9° (likely 47°8° to 51°11°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	72%	81%	0
Sat 10p	Cloudy	47°8° (likely 44°7° to 49°9°)	47°8°	0%	0 mph0 km/h, gusts 3 mph5 km/h	77%	80%	0
Sat 11p	Cloudy	45°7° (likely 42°6° to 50°10°)	45°7°	20%	0 mph0 km/h, gusts 3 mph5 km/h	81%	83%	0
Sun 12a	Rain	44°7° (likely 36°2° to 51°11°)	44°7°	20%	0 mph0 km/h, gusts 3 mph4 km/h	83%	79%	0
Sun 1a	Rain	44°7° (likely 35°2° to 50°10°)	44°7°	20%	0 mph0 km/h, gusts 3 mph5 km/h	85%	80%	0
Sun 2a	Rain	43°6° (likely 34°1° to 50°10°)	43°6°	20%	0 mph0 km/h, gusts 3 mph5 km/h	87%	81%	0
Sun 3a	Rain	42°6° (likely 34°1° to 50°10°)	42°6°	20%	0 mph0 km/h, gusts 4 mph6 km/h	89%	77%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 23. Fog. High 61°16°, low 38°3°. Typical 60°16° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Fog, 37°3°
  Dry
Official NWS forecast
Today: Areas of fog before 10am. Sunny, with a high near 61. North wind around 1 mph.
Tonight: Patchy fog. Mostly clear. Low around 38, with temperatures rising to around 40 overnight. West wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–63°17°
Low, likely
37°3°–41°5°
Typical high / low
60°16° / 46°8°
Wind
10 mph16 km/h, gusts 18 mph29 km/h
UV peak
4
Tomorrow, Oct 24. Fog. High 62°17°, low 37°3°. Typical 59°15° / 46°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Fog, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Rain, 42°6°
  20% chance
Official NWS forecast
Day: Areas of fog and patchy frost before 10am. Partly sunny, with a high near 62. Wind around 0 mph.
Night: Rain likely after 11pm. Mostly cloudy, with a low around 37. Wind around 0 mph. Chance of precipitation is 60%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
56°13°–65°18°
Low, likely
35°2°–39°4°
Typical high / low
59°15° / 46°8°
Wind
5 mph9 km/h
UV peak
3
Sunday, Oct 25. Rain. High 60°16°, low 42°6°. Typical 59°15° / 46°8°. Rain 0.48 in12 mm, 70% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 43°6°
  60% chance · 0.14 in3.7 mm
2. Afternoon
  noon–6 PM
  Rain, 56°14°
  70% chance · 0.14 in3.4 mm
3. Evening
  6 PM–midnight
  Rain, 53°12°
  60% chance · 0.16 in4.1 mm
4. Overnight
  midnight–6 AM
  Drizzle, 50°10°
  60% chance · 0.03 in0.9 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely before 7am, then rain likely and patchy fog. Mostly cloudy, with a high near 60. Chance of precipitation is 70%.
Night: Rain likely before 5am, then rain likely and patchy fog. Mostly cloudy, with a low around 42.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
53°12°–61°16°
Low, likely
35°2°–48°9°
Typical high / low
59°15° / 46°8°
Wind
13 mph20 km/h, gusts 23 mph36 km/h
UV peak
3
Monday, Oct 26. Rain. High 60°16°, low 40°4°. Typical 59°15° / 45°7°. Rain 0.23 in5.8 mm, 70% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 49°9°
  60% chance · 0.03 in0.9 mm
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  60% chance · 0.11 in2.7 mm
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  40% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Cloudy, 48°9°
  20% chance · 0.02 in0.4 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely and patchy fog. Mostly cloudy, with a high near 60.
Night: A chance of rain before 5am. Mostly cloudy, with a low around 40.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
53°12°–60°16°
Low, likely
40°4°–49°9°
Typical high / low
59°15° / 45°7°
Wind
10 mph17 km/h, gusts 20 mph31 km/h
UV peak
3
Tuesday, Oct 27. Rain. High 60°16°, low 38°3°. Typical 58°14° / 45°7°. Rain 0.07 in1.8 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 58°14°
  20% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Cloudy, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain between 11am and 5pm. Partly sunny, with a high near 60.
Night: A slight chance of rain after 5am. Mostly cloudy, with a low around 38.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–60°16°
Low, likely
38°3°–48°9°
Typical high / low
58°14° / 45°7°
Wind
6 mph9 km/h, gusts 14 mph23 km/h
UV peak
3
Wednesday, Oct 28. Rain. High 61°16°, low 39°4°. Typical 58°14° / 45°7°. Rain 0.07 in1.8 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 56°14°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Partly sunny, with a high near 61.
Night: A slight chance of rain before 5am. Mostly cloudy, with a low around 39.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
51°11°–62°17°
Low, likely
39°4°–46°8°
Typical high / low
58°14° / 45°7°
Wind
10 mph17 km/h, gusts 22 mph35 km/h
UV peak
3
Thursday, Oct 29. Rain. High 61°16°, low 44°7°. Typical 58°14° / 45°7°. Rain 0.08 in2 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain between 11am and 5pm. Partly sunny, with a high near 61.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
52°11°–62°17°
Low, likely
42°6°–46°8°
Typical high / low
58°14° / 45°7°
Wind
9 mph14 km/h, gusts 20 mph33 km/h
UV peak
3
Friday, Oct 30. Sunny. High 55°13°, low 43°6°. Typical 57°14° / 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
49°9°–60°16°
Low, likely
40°4°–46°8°
Typical high / low
57°14° / 45°7°
Wind
6 mph9 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 56°13°, low 44°7°. Typical 57°14° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
51°11°–65°18°
Low, likely
41°5°–48°9°
Typical high / low
57°14° / 44°7°
Wind
6 mph10 km/h, gusts 15 mph23 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 59°15°, low 44°7°. Typical 57°14° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
55°13°–61°16°
Low, likely
42°6°–48°9°
Typical high / low
57°14° / 44°7°
Wind
6 mph9 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 38°.
Tomorrow
Dry, high 62°, low 37°.
Sunday
67% chance of rain, high 60°, low 42°.
Rest of week
Highs 55–61°; chance of precipitation on Monday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (PQR) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 63% less heating than a typical week.

This week 34Typical 91

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 26
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 15 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 39°F).

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Portland Kgw-Tv · official normals 1991–2020 · records 1874–2026

Oct 23, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

On average 4°2° warmer than normal (daily mean temperature).

+4°+2°SatOct 17
+1°±0°SunOct 18
+3°+2°MonOct 19
+7°+4°TueOct 20
+6°+3°WedOct 21
+4°+2°ThuOct 22
—FriOct 23

Hillsboro weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 33 min; Losing 2 min 53 s a day; shortest Dec 21, 1 h 51 min less
Golden hour: 5:30–6:30 PM; Morning 7:20–8:20 AM
Blue hour: 6:30–6:42 PM; Morning 7:08–7:20 AM; first light 7:08 AM

Stars tonight? Good

Clear 4:09–7:08 AM; moon 91% lit, sets 4:44 AM.

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:44 AM · rises 4:52 PM
Full moon: Oct 25
New moon: Nov 8

Looking east from Hillsboro. The highest point on the skyline is about 11,100 ft, 60 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

2 active weather alerts

Frost Advisory