30YearWeather
Portland in August
Portland weather in August - United States
😊Warm & Pleasant

Portland Weather in August

Plan your August trip to Portland, United States. Based on 30 years of NASA data, expect temperatures of 28°C (high) to 15°C (low), with 6% rain probability and 8 hours of daily sunshine. Great conditions with only 0 rainy days expected.

Avg High
28°C

Hottest around day 12

Avg Low
15°C

Coolest around day 31

Rainy Days
0days

6% avg rain chance

Sunshine
8hrs/day

Summer season

Portland August Weather Calendar

Click any day to see detailed weather information

Day 1
clear-day
Sunny
29°C4%
Day 2
clear-day
Sunny
29°C2%
Day 3
clear-day
Sunny
29°C2%
Day 4
clear-day
Sunny
29°C5%
Day 5
clear-day
Sunny
28°C6%
Day 6
clear-day
Sunny
28°C5%
Day 7
clear-day
Sunny
28°C7%
Day 8
clear-day
Sunny
28°C8%
Day 9
clear-day
Sunny
28°C5%
Day 10
clear-day
Sunny
29°C4%
Day 11
clear-day
Sunny
29°C5%
Day 12
clear-day
Sunny
29°C4%
Day 13
clear-day
Sunny
29°C4%
Day 14
clear-day
Sunny
29°C6%
Day 15
clear-day
Sunny
29°C5%
Day 16
clear-day
Sunny
29°C6%
Day 17
clear-day
Sunny
29°C7%
Day 18
clear-day
Sunny
28°C6%
Day 19
clear-day
Sunny
28°C6%
Day 20
clear-day
Sunny
28°C7%
Day 21
clear-day
Sunny
27°C7%
Day 22
clear-day
Sunny
27°C8%
Day 23
clear-day
Sunny
27°C8%
Day 24
clear-day
Sunny
27°C9%
Day 25
clear-day
Sunny
28°C7%
Day 26
clear-day
Sunny
28°C7%
Day 27
clear-day
Sunny
28°C6%
Day 28
clear-day
Sunny
27°C5%
Day 29
clear-day
Sunny
27°C5%
Day 30
clear-day
Sunny
27°C5%
Day 31
clear-day
Sunny
27°C6%

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Portland

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Well Connected
62/ 100
Traffic Index

Popular destination

Peak Daily Arrivals

0

slots per day

Peak

Aug

Low

Jan

Monthly Traffic Distribution

203
Jan
204
Feb
225
Mar
256
Apr
287
May
297
Jun
324
Jul
326
Aug
305
Sep
275
Oct
209
Nov
253
Dec
Traffic Level
Low Season

Key Connections

Seattle Tacoma (SEA)
Los Angeles (LAX)
Denver (DEN)
Phoenix Sky Harbor (PHX)
San Francisco (SFO)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is August a Good Time to Visit Portland?

👍Very good conditions overall
Short Answer

Portland's August delivers on its reputation: 28°C, 6% rain, 11.6h sunshine. The trade-off? Peak crowds and prices at 100% capacity.

Decision Factors

Peak tourist season

100% of annual peak - expect crowds and peak prices

Excellent dry conditions

Only 6% rain probability - ideal for outdoor activities

Near active volcano: Mount St. Helens

Medium volcanic risk

Plenty of sunshine

11.6h of sunshine daily

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 28.2°C temperatures and low 6% rain risk

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 28.2°C, 6% rain chance

  • 📸
    Photographers

    11.6h sunshine, 64% clear skies for golden hour shots

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💑
    Honeymoon couples

    Wedding score 100/100 with romantic weather conditions

Who Should Avoid

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

930 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Portland in August averages 28°C with 6% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Portland in August

What are the temperatures in Portland in August?

Daytime highs average 28°C, nights drop to 15°C. There's a significant day/night temperature swing.

How many rainy days in Portland in August?

Expect around 0 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Portland in August?

Comfortable casual wear with a light jacket for evenings.

Is August peak season in Portland?

This is typically peak season with higher prices. Book 2-3 months ahead.