Climate change in Portland, Oregon

Climate change is affecting locations like Portland in a variety of ways. In fall, these impacts include more extreme rainfall, changes to fall foliage, and more frequent fire weather.

Explore these pages to learn how people in Portland are at risk in a warming world.

Since 1970, average annual temperatures in Portland have gotten 2.7°F warmer, reflecting an overall warming trend.

Warming puts people and ecosystems at risk from more frequent and intense extreme weather.
Overall, the contiguous U.S. is about 2.8°F warmer today than in 1970, based on average temperatures.
Data source: NOAA ACIS

Since 1970, Portland's annual precipitation has decreased by 0.9 inches.

Climate change is supercharging the water cycle and bringing heavier precipitation extremes across the U.S.
For every 1°F of warming, the air can hold 4% more moisture, increasing the chances of heavier downpours that contribute to flash flooding hazards.
Data source: NOAA ACIS

As of October 9, 2026, Portland has experienced 18 days this year with temperatures made twice as likely by climate change.

This is according to the Climate Shift Index (CSI), which quantifies the influence of human-caused climate change on daily average temperatures. Temperatures on these days had a CSI level 2 or higher, which indicates local temperatures were at least two times more likely due to climate change.
The CSI ranges from -5 to +5. Positive levels indicate temperatures made more likely due to climate change (while negative scores indicate conditions made less likely).
Data source: Climate Shift Index

Portland's climate threats in include:

Portland has experienced 3 more fire weather days since 1973.

Climate change is causing more frequent fire weather — a combination of hot, dry, windy conditions that prime the landscape for wildfires to ignite and spread
Wildfire seasons are lengthening and intensifying, particularly in the western U.S.
Source: NOAA Local Climatological Data

About 99% of Oregon is currently in drought or abnormally dry.

Rising temperatures are worsening the risk of drought in parts of the U.S.
Droughts can lead to crop failure or pasture losses, impact water supplies, affect public health, degrade ecosystems, and increase the amount of fuel for wildfires by drying grasses and forests.
The map shows the percentage of land area that is abnormally dry (category D0) or in drought (categories D1-4). This is according to the U.S. Drought Monitor's drought classification scale.
Data source: U.S. Drought Monitor

Since 1970, average fall temperatures in Portland have gotten 2.7°F warmer, reflecting an overall warming trend.

Fall warming means that risky heat, fire weather, and allergies linger later into the year.
Data source: NOAA ACIS

The sea level in Portland is projected to rise 0.5 feet by 2050 even if nations meet their pledged commitments to reduce heat-trapping pollution.

Increasing flood risk is driven by our warming climate, which is causing sea levels around the world to rise. Rising sea levels push tides and storm surges higher and farther inland.
Climate Central’s Coastal Risk Finder provides maps and analysis of the people, homes, and land in the U.S. projected to be at risk from worsening coastal flooding driven by rising seas.

Explore some ways climate change is affecting Portland in fall

Heavier downpours

Climate change is supercharging the water cycle, driving heavier rainfall and flood risk.

Key concepts:

Climate change is supercharging the water cycle, driving heavier rainfall and flood risk.
From 1958–2021, extreme precipitation days grew in every region, led by the Northeast (+60%) and Midwest (+45%).
Intensification will continue with future warming.
Short bursts of extreme rain threaten people, ecosystems, and infrastructure nationwide.

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Impacts to fall color

Conditions that trigger fall color are shifting with climate change.

Key concepts:

Foliage depends on temperature, day length, and rainfall — as well as other conditions including extreme weather events.
Cool fall nights can boost color, but they have warmed 2.7°F (1970–2023) in 212 U.S. locations.
Warmer falls can delay or shorten peak foliage.

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More fire weather

Wildfire seasons are lengthening and intensifying.

Key concepts:

Climate Central analyzed U.S. fire weather (hot, dry, windy conditions) from 1973–2024.
Wildfire seasons are lengthening and intensifying, especially in the West.
Fire weather is rising most in spring nationwide

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Impacts to food prices

Extreme events fueled by climate change can damage crops, reduce yields, and disrupt supply chains.

Key concepts:

Food and climate change are closely linked. Food systems account for about one-quarter of all heat-trapping pollution.
Meanwhile, extreme events fueled by climate change can damage crops, reduce yields, and disrupt supply chains — all of which can drive food prices higher.
The availability, quality, and affordability of food reflect a complex set of climatic and socioeconomic factors. Emerging research is providing insight into the role of climate change.

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More graphics about Portland and climate change

Browse climate-related graphics for all seasons localized for Portland, available for download and use consistent with our Terms of use.

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Climate change in Portland, Oregon

Portland's climate threats in fall include:

Explore some ways climate change is affecting Portland in fall

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Portland's climate threats in include: