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Atlanta vs Portland weather: climate comparison
Atlanta is the warmer of the two, averaging 62°F (17°C) over the year against 54°F (12°C) in Portland. Portland is wetter, with 50.4 in (1280 mm) of precipitation a year to Atlanta's 49.0 in (1245 mm). Below: every month side by side, from 30 years of ERA5 data (1996–2025).
- Mean temperature
- 16.7°C Atlanta
12.0°C Portland - Annual precipitation
- 1245.1 mm Atlanta
1279.7 mm Portland - Rainy days a year
- 128 Atlanta
146 Portland - Sunshine per day
- 9.1 h Atlanta
8.5 h Portland
Month by month
| Month | Atlanta | Portland |
|---|---|---|
| January | 10.9°C | 8.1°C |
| February | 13.5°C | 9.5°C |
| March | 17.4°C | 12.0°C |
| April | 21.8°C | 14.8°C |
| May | 26.2°C | 18.6°C |
| June | 29.6°C | 22.2°C |
| July | 30.8°C | 27.6°C |
| August | 30.4°C | 27.9°C |
| September | 27.5°C | 23.9°C |
| October | 22.4°C | 16.8°C |
| November | 16.8°C | 11.0°C |
| December | 12.4°C | 7.7°C |
Year at a glance
| Measure | Atlanta | Portland |
|---|---|---|
| Mean annual temperature | 16.7°C | 12.0°C |
| Warmest month (avg high) | Jul · 31°C | Aug · 28°C |
| Coldest month (avg low) | Jan · 2°C | Feb · 2°C |
| Annual range (warmest high − coldest low) | 29°C | 26°C |
| Annual precipitation | 1245.1 mm | 1279.7 mm |
| Rainy days per year | 128 | 146 |
| Wettest / driest month | Jul / Oct | Dec / Jul |
| Average sunshine per day | 9.1 h | 8.5 h |
In short: Atlanta is the warmest overall (16.7°C mean); Portland gets the most precipitation (1279.7 mm a year); Atlanta is the sunniest (9.1 h a day on average); Portland has the smallest swing between its warmest and coldest months.
Record high 1996–2025: Atlanta 39.9°C (2012-06-30), Portland 46.0°C (2021-06-28). Record low: Atlanta -13.6°C (2022-12-24), Portland -15.3°C (1996-02-02).
Source: Open-Meteo Historical Weather API (CC BY 4.0). Values are ERA5 reanalysis model data on a ~9–25 km grid, not readings from a weather station, so a single town’s thermometer can differ by a few degrees and local showers can be missed. Monthly means of daily ERA5 values, 1996–2025, for the grid cells nearest Atlanta (33.78, -84.40) and Portland (45.52, -122.64).
Which months differ most?
The gap in average highs is widest in May, when Atlanta runs 14°F / 8°C warmer, and narrowest in August (5°F / 3°C apart). The biggest rainfall difference is in July: Atlanta gets 4.7 in (119 mm) more on average.
Add a third or fourth city, or swap in any other place, in the full comparison tool. For one city in depth, see the Atlanta climate and Portland climate pages.
Compare Atlanta or Portland with another city
Questions people ask
Is Atlanta warmer than Portland?
Atlanta is warmer on average: its mean annual temperature is 62°F (17°C) against 54°F (12°C) in Portland (ERA5, 1996–2025).
Which gets more rain, Atlanta or Portland?
Portland, with about 50.4 in (1280 mm) of precipitation a year and 146 days with at least 1 mm, compared with 49.0 in (1245 mm) and 128 days in Atlanta.
Which is sunnier, Atlanta or Portland?
Atlanta averages more sunshine: 9.1 h a day against 8.5 h. Sunshine duration is modelled from cloud cover.
How reliable is this comparison?
Both cities use the same 30-year reanalysis, so differences are consistent. Absolute values describe a grid cell several kilometres wide and can differ by a degree or two from the airport station.