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Seoul vs Portland
Comparing Seoul change · Portland change
Seoul and Portland have nearly identical year-round temperatures; Seoul is the wetter, with 569 mm more rain a year, and Seoul the sunnier.
How the seasons compare
The differences between Seoul and Portland, in everyday terms.
Summers
Seoul has hotter summers
Seoul: Warm
Portland: Warm
Winters
Portland has much milder winters
Seoul: Cold
Portland: Chilly
Rain & snow
Seoul is wetter
Seoul: Wet
Portland: Moderate rainfall
Sky
Seoul is sunnier
Seoul: Partly cloudy
Portland: Often cloudy
Month-by-month charts
Temperature
Seoul and Portland run remarkably close all year.
Precipitation
Seoul is the wetter — about 569 mm more across the year.
Clear skies
Seoul has the clearer skies — the higher line.
Exact monthly numbers
Tap a metric to open its full table. Desktop shows all twelve months; on a phone each metric splits into Jan–Jun and Jul–Dec.
Avg high (°C) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 2 | 5 | 11 | 18 | 24 | 28 | 29 | 30 | 26 | 20 | 12 | 4 |
| Portland | 9 | 11 | 14 | 17 | 21 | 24 | 28 | 28 | 25 | 18 | 12 | 8 |
| Difference | +7 | +6 | +3 | -1 | -3 | -4 | -1 | -2 | -1 | -2 | — | +4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | 2 | 5 | 11 | 18 | 24 | 28 |
| Portland | 9 | 11 | 14 | 17 | 21 | 24 |
| Difference | +7 | +6 | +3 | -1 | -3 | -4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 29 | 30 | 26 | 20 | 12 | 4 |
| Portland | 28 | 28 | 25 | 18 | 12 | 8 |
| Difference | -1 | -2 | -1 | -2 | — | +4 |
Avg low (°C) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | -6 | -4 | 1 | 7 | 13 | 18 | 22 | 23 | 17 | 10 | 3 | -4 |
| Portland | 2 | 3 | 4 | 7 | 10 | 12 | 15 | 15 | 12 | 8 | 5 | 2 |
| Difference | +9 | +7 | +3 | -1 | -3 | -6 | -7 | -8 | -5 | -2 | +2 | +6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | -6 | -4 | 1 | 7 | 13 | 18 |
| Portland | 2 | 3 | 4 | 7 | 10 | 12 |
| Difference | +9 | +7 | +3 | -1 | -3 | -6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 22 | 23 | 17 | 10 | 3 | -4 |
| Portland | 15 | 15 | 12 | 8 | 5 | 2 |
| Difference | -7 | -8 | -5 | -2 | +2 | +6 |
Precipitation (mm) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 21 | 32 | 41 | 75 | 104 | 138 | 440 | 362 | 154 | 58 | 56 | 25 |
| Portland | 128 | 93 | 101 | 73 | 64 | 41 | 13 | 14 | 39 | 87 | 138 | 147 |
| Difference | +106 | +61 | +59 | -2 | -40 | -96 | -427 | -349 | -116 | +29 | +83 | +122 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | 21 | 32 | 41 | 75 | 104 | 138 |
| Portland | 128 | 93 | 101 | 73 | 64 | 41 |
| Difference | +106 | +61 | +59 | -2 | -40 | -96 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 440 | 362 | 154 | 58 | 56 | 25 |
| Portland | 13 | 14 | 39 | 87 | 138 | 147 |
| Difference | -427 | -349 | -116 | +29 | +83 | +122 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | — | — | — | — | — | — | — | — | — | — | — | — |
| Portland | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | — | — | — | — | — | — |
| Portland | 4 | 3 | 0 | 0 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | — | — | — | — | — | — |
| Portland | 0 | 0 | 0 | 0 | 0 | 3 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 51 | 50 | 52 | 55 | 58 | 67 | 75 | 65 | 56 | 46 | 52 | 51 |
| Portland | 76 | 74 | 76 | 75 | 70 | 64 | 43 | 43 | 49 | 63 | 75 | 78 |
| Difference | +24 | +24 | +23 | +20 | +11 | -3 | -31 | -21 | -7 | +17 | +24 | +26 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | 51 | 50 | 52 | 55 | 58 | 67 |
| Portland | 76 | 74 | 76 | 75 | 70 | 64 |
| Difference | +24 | +24 | +23 | +20 | +11 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 75 | 65 | 56 | 46 | 52 | 51 |
| Portland | 43 | 43 | 49 | 63 | 75 | 78 |
| Difference | -31 | -21 | -7 | +17 | +24 | +26 |
Relative humidity (%) Portland runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 76 | 74 | 74 | 74 | 75 | 78 | 85 | 84 | 79 | 75 | 76 | 77 |
| Portland | 92 | 89 | 87 | 84 | 82 | 80 | 72 | 66 | 68 | 79 | 89 | 92 |
| Difference | +16 | +15 | +13 | +10 | +7 | +3 | -13 | -18 | -11 | +4 | +14 | +16 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | 76 | 74 | 74 | 74 | 75 | 78 |
| Portland | 92 | 89 | 87 | 84 | 82 | 80 |
| Difference | +16 | +15 | +13 | +10 | +7 | +3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 85 | 84 | 79 | 75 | 76 | 77 |
| Portland | 72 | 66 | 68 | 79 | 89 | 92 |
| Difference | -13 | -18 | -11 | +4 | +14 | +16 |
How both climates are changing
Both cities are warming. Each city has its own warming trend; see its trends page for the year-by-year detail. Seoul trends → · Portland trends →
Methodology & sources
Seoul
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Seoul City, a weather station, about 1 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
Portland
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Portland Intl AP (NOAA GHCN station USW00024229), about 10 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
← change Seoul · change Portland → · Seoul page · Portland page