Portland in Summer
In summer (June, July and August), Portland sees average daytime highs around 88°F and overnight lows near 78°F, with 7.4 in of rain over about 28 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 88°F. The sky is clear or mostly clear about 52% of the time across summer, and the air most often feels miserable.
Summer is Portland's weakest season of the year to visit on our travel score. For the whole year in context, see Portland's year-round climate.
- Avg daytime high
- 88°F
- warmest season of the year
- Avg overnight low
- 78°F
- Rainfall
- 7.4 in
- 28 wet days
- Avg wind
- 11 mph
- Travel score
- 4.5
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Portland in Summer
Across summer, daytime highs hold fairly steady around 88°F.
A typical summer day in Portland reaches about 88°F and drops to 78°F overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Portland
Once humidity and wind are folded in, summer brings about 92 days that feel above 90°F and 0 that feel at or below 32°F.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Portland weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 65° / 51° | 2.1 | 6.5 | 10.4 | 6.5 |
| Feb | 68° / 54° | 1.5 | 5.2 | 11 | 6.9 |
| Mar | 73° / 60° | 2.2 | 6.2 | 11.8 | 7.4 |
| Apr | 78° / 66° | 2.0 | 6.4 | 12.6 | 7.4 |
| May | 83° / 73° | 2.7 | 8.8 | 13.4 | 6.1 |
| Jun | 87° / 77° | 2.9 | 10.2 | 13.7 | 4.8 |
| Jul | 89° / 78° | 2.2 | 8.6 | 13.6 | 4.5 |
| Aug | 89° / 78° | 2.3 | 9.7 | 13 | 4.2 |
| Sep | 87° / 75° | 4.3 | 13.8 | 12.2 | 4.5 |
| Oct | 81° / 67° | 3.4 | 8.8 | 11.3 | 6.8 |
| Nov | 73° / 59° | 2.2 | 6.8 | 10.6 | 7.4 |
| Dec | 67° / 52° | 2.1 | 6.3 | 10.3 | 6.7 |
Cloud cover in Summer
The sky is clear or mostly clear about 52% of the time across summer.
Chance of precipitation in Summer
Portland gets around 7.4 in of rain over 28 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 11 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 36 min in early June to 12 h 36 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.4 kWh/m².
Hazard calendar for Portland
In summer, Portland overlaps its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Portland sits in the Atlantic hurricane belt; the season peaks August–October.
Is summer a good time to visit Portland?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Portland for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Portland in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Portland sees daytime highs around 88°F and nights near 78°F. Pack light clothes and sun protection. Worth having: rain gear. About 28 days see rain.
Sea temperature near Portland in Summer
The nearest coast averages about 83°F across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 21 mi away) is warmest in September at about 84°F and coldest in February near 64°F.
It's comfortable for a long swim from Mar 29 to Dec 20 — about 8.8 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 65 | 64 | 66 | 71 | 77 | 82 | 83 | 84 | 84 | 80 | 73 | 69 |
| Comfort | Cool | Cool | Cool | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Refreshing | Refreshing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 65 | Cool |
| Feb | 64 | Cool |
| Mar | 66 | Cool |
| Apr | 71 | Refreshing |
| May | 77 | Warm |
| Jun | 82 | Tropical |
| Jul | 83 | Tropical |
| Aug | 84 | Tropical |
| Sep | 84 | Tropical |
| Oct | 80 | Warm |
| Nov | 73 | Refreshing |
| Dec | 69 | Refreshing |
UV index in Portland in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Portland peaks around June 16 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 5 | 6 | 7 | 10 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| Level | Moderate | High | High | Very high | Extreme | Extreme | Extreme | Extreme | Very high | High | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | Moderate |
| Feb | 6 | High |
| Mar | 7 | High |
| Apr | 10 | Very high |
| May | 11 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 7 | High |
| Nov | 5 | High |
| Dec | 4 | Moderate |
Air quality in Portland in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Portland is worst in July — around 20 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (November, 6 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 9 | 12 | 12 | 16 | 17 | 20 | 13 | 11 | 6 | 6 | 7 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 9 | Good |
| Mar | 12 | Good |
| Apr | 12 | Good |
| May | 16 | Moderate |
| Jun | 17 | Moderate |
| Jul | 20 | Moderate |
| Aug | 13 | Moderate |
| Sep | 11 | Good |
| Oct | 6 | Good |
| Nov | 6 | Good |
| Dec | 7 | Good |
Where is Portland?
Portland sits at 27.9°N, 97.3°W, 43 ft above sea level, in United States. The nearest listed city is Corpus Christi, 6.8 mi away.
Topography around Portland
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Portland.
Within 2 miles, the terrain around Portland has only modest variations in elevation — a maximum elevation change of 56 ft around an average of 16 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 115 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 394 ft.
The land around Portland is covered by water (47%) and artificial surfaces (25%) within 2 miles, water (38%) and cropland (33%) within 10 miles, and water (33%), grassland (23%) and cropland (20%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Portland (27.8773°, -97.3239°, elevation 43 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.