Portland in Spring
In spring (March, April and May), Portland sees average daytime highs around 78°F and overnight lows near 66°F, with 6.9 in of rain over about 21 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs climb from about 70°F in early March to 85°F by late May. The sky is clear or mostly clear about 36% of the time across spring, and the air most often feels oppressive.
Spring is Portland's best 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
- 78°F
- 3rd-warmest season
- Avg overnight low
- 66°F
- Rainfall
- 6.9 in
- 21 wet days
- Avg wind
- 12 mph
- Travel score
- 7.0
- best season of the year
- Months
- Mar · Apr · May
Temperature in Portland in Spring
Over the season highs climb from about 70°F in early March to 85°F by late May.
A typical spring day in Portland reaches about 78°F and drops to 66°F overnight. The warmest of the three months is May, the coolest March.
How spring really feels in Portland
Once humidity and wind are folded in, spring brings about 10 days that feel above 90°F and 0 that feel at or below 32°F.
The story in spring is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Portland weather by month
How the three spring months (March, April and May) 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 Spring
The sky is clear or mostly clear about 36% of the time across spring.
Chance of precipitation in Spring
Portland gets around 6.9 in of rain over 21 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 12 mph across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 24 min in early March to 13 h 36 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 5.4 kWh/m².
Hazard calendar for Portland
None of Portland's seasonal hazards peak in spring. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
Portland sits in the Atlantic hurricane belt; the season peaks August–October.
Is spring a good time to visit Portland?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring 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 Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Portland sees daytime highs around 78°F and nights near 66°F. Pack light clothes and sun protection. Worth having: rain gear. About 21 days see rain.
Sea temperature near Portland in Spring
The nearest coast averages about 71°F across spring — 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 Spring
Clear-sky midday UV across spring averages around 9 (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 Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring 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.