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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 22 in 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 22 in 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 (°F) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 36 | 41 | 52 | 64 | 74 | 82 | 84 | 86 | 79 | 68 | 53 | 39 |
| Portland | 48 | 52 | 57 | 62 | 69 | 74 | 82 | 82 | 77 | 64 | 54 | 47 |
| Difference | +12 | +10 | +5 | -2 | -5 | -7 | -2 | -4 | -2 | -4 | — | +8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | 36 | 41 | 52 | 64 | 74 | 82 |
| Portland | 48 | 52 | 57 | 62 | 69 | 74 |
| Difference | +12 | +10 | +5 | -2 | -5 | -7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 84 | 86 | 79 | 68 | 53 | 39 |
| Portland | 82 | 82 | 77 | 64 | 54 | 47 |
| Difference | -2 | -4 | -2 | -4 | — | +8 |
Avg low (°F) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 21 | 25 | 34 | 45 | 56 | 65 | 72 | 73 | 63 | 50 | 37 | 25 |
| Portland | 36 | 37 | 40 | 44 | 49 | 54 | 59 | 59 | 54 | 47 | 41 | 36 |
| Difference | +15 | +12 | +5 | -2 | -6 | -11 | -13 | -14 | -9 | -3 | +4 | +12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | 21 | 25 | 34 | 45 | 56 | 65 |
| Portland | 36 | 37 | 40 | 44 | 49 | 54 |
| Difference | +15 | +12 | +5 | -2 | -6 | -11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 72 | 73 | 63 | 50 | 37 | 25 |
| Portland | 59 | 59 | 54 | 47 | 41 | 36 |
| Difference | -13 | -14 | -9 | -3 | +4 | +12 |
Precipitation (in) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 0.8 | 1.3 | 1.6 | 3 | 4.1 | 5.4 | 17.3 | 14.3 | 6.1 | 2.3 | 2.2 | 1 |
| Portland | 5 | 3.7 | 4 | 2.9 | 2.5 | 1.6 | 0.5 | 0.5 | 1.5 | 3.4 | 5.5 | 5.8 |
| Difference | +4.2 | +2.4 | +2.3 | -0.1 | -1.6 | -3.8 | -16.8 | -13.7 | -4.6 | +1.1 | +3.3 | +4.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | 0.8 | 1.3 | 1.6 | 3 | 4.1 | 5.4 |
| Portland | 5 | 3.7 | 4 | 2.9 | 2.5 | 1.6 |
| Difference | +4.2 | +2.4 | +2.3 | -0.1 | -1.6 | -3.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | 17.3 | 14.3 | 6.1 | 2.3 | 2.2 | 1 |
| Portland | 0.5 | 0.5 | 1.5 | 3.4 | 5.5 | 5.8 |
| Difference | -16.8 | -13.7 | -4.6 | +1.1 | +3.3 | +4.8 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | — | — | — | — | — | — | — | — | — | — | — | — |
| Portland | 1.7 | 1.2 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.2 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Seoul | — | — | — | — | — | — |
| Portland | 1.7 | 1.2 | 0.1 | 0 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Seoul | — | — | — | — | — | — |
| Portland | 0 | 0 | 0 | 0 | 0 | 1.2 |
| 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