Portland is 5.7°C (10.3°F) warmer by day, Portland has 13.1°C (23.6°F) warmer nights, Anchorage gets 360 mm (14.2 in) more rain a year.
Anchorage is at its warmest in July and coolest in January, while Portland peaks in August and bottoms out in January. Month for month, Portland is the warmer of the two in 12 of 12 months.
Anchorage is the wetter of the two, collecting 1,629 mm (64.1 in) of rain a year against 1,269 mm (50 in) in Portland. The most comfortable time to visit is June, July and August in Anchorage and July, August and September in Portland.
| Anchorage | Metric | Portland |
|---|---|---|
| 🌡️ Temperature | ||
| 50.2°F | 🌡️Average daytime high | 60.4°F |
| 9.7°F | 🌙Average nighttime low | 33.3°F |
| July | 🔥Hottest month | August |
| January | ❄️Coldest month | January |
| 🌧️ Rain | ||
| 64.1 in | 🌧️Annual rainfall | 50 in |
| September | ☔Wettest month | December |
| April | 🏜️Driest month | August |
| 💨 Climate | ||
| 84% | 💧Average humidity | 84% |
| 2.5 m/s | 💨Average wind speed | 3.8 m/s |
Overnight, Anchorage typically falls to around -12.4°C (9.7°F) while Portland settles near 0.7°C (33.3°F).
Anchorage is hottest in July and coldest in January, whereas Portland peaks in August and is coolest in January.
Anchorage sees the most rain in September and the least in April; Portland is wettest in December and driest in August.
Anchorage feels the more humid of the two, averaging 84% relative humidity against 84%.
For Portland, the pick of the year is July, August and September.
Month by month, here is the coldest night, the average day and the hottest afternoon each city can expect. Switch Compare to read rainfall, humidity, wind or solar instead, and Period to move between the long-term 45-year average and any single year — the shading is a quick warm-to-cool guide.
| Month | Anchorage | Portland | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | -18 | 7.2❄️ | 32.4 | 8.4 | 27.7❄️ | 46.8 |
| February | -14.4 | 9.3 | 33.1 | 10.9 | 27.7 | 44.4 |
| March | -8.5 | 13.1 | 34.7 | 16 | 32.2 | 48.6 |
| April | 2.7 | 20.8 | 39 | 30.6 | 43.2 | 55.8 |
| May | 23.4 | 43.9 | 64.2 | 39.9 | 52.2 | 64.6 |
| June | 37.6 | 56.1 | 74.5 | 48.6 | 59.5 | 70.5 |
| July | 43.9 | 60.1🔥 | 76.3 | 56.8 | 65.8 | 74.8 |
| August | 39.2 | 55.8 | 72.5 | 56.7 | 66🔥 | 75.2 |
| September | 27.3 | 44.4 | 61.7 | 49.3 | 60.4 | 71.8 |
| October | 5.7 | 26.8 | 47.8 | 39.2 | 51.8 | 64.2 |
| November | -9.6 | 11.8 | 33.4 | 28.6 | 42.8 | 57.2 |
| December | -12.5 | 9.9 | 32.2 | 15.3 | 33.3 | 51.1 |
| Annual Avg | 9.7 | 29.8 | 50.2 | 33.4 | 46.9 | 60.4 |
Min / mean / max temperature (°F). 🔥 marks each city's hottest month, ❄️ its coldest; shading runs cool blue to warm red.
The same figures plotted out, so the shape of a typical year is easier to see than in a grid. Where the two lines run close together Anchorage and Portland feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Anchorage Portland
Choose which city to keep, then search for any other city in our database — we'll build the comparison for you.
Quick answers to the questions people ask most when comparing Anchorage and Portland — each drawn straight from the climate figures above.
Portland is the warmer of the two. It averages daytime highs of 15.8°C (60.4°F) against 10.1°C (50.2°F) in Anchorage — roughly 5.7°C (10.3°F) warmer by day. Nights are milder in Portland, with average lows of 0.7°C (33.3°F) versus -12.4°C (9.7°F).
Anchorage is hottest in July, averaging highs of about 24.6°C (76.3°F), while Portland peaks in August at around 24°C (75.2°F). That makes Anchorage the hotter of the two at the height of summer.
Anchorage gets colder. In its coldest month (January) overnight lows average about -27.8°C (-18°F), compared with -13.1°C (8.5°F) at the low point of the year in Portland.
Anchorage is the wetter city, collecting about 1,629 mm (64.1 in) of rain a year versus 1,269 mm (50 in) in Portland. Anchorage is wettest in September and driest in April; Portland is wettest in December and driest in August.
Humidity is similar in both, averaging around 84% in Anchorage and 84% in Portland across the year.
The most comfortable months in Anchorage are June, July and August, when average temperatures are at their mildest.
Portland is at its most pleasant around July, August and September, based on the mildest average temperatures of the year.
Portland is the warmer city in all 12 months of the year. The gap is widest in November, about 17.2°C (31°F), and narrowest in June, about 1.9°C (3.4°F).
Anchorage has the bigger seasonal swing, about 29.4°C (52.9°F) between its coldest and hottest months versus 21.3°C (38.3°F) in Portland — so Portland has the steadier, more even climate.
On climate alone, Portland comes out ahead — it offers warmer days and less rain than Anchorage. Anchorage is the better fit only if you'd actually prefer cooler weather and more rainfall.
Every figure on this page is calculated from NASA POWER satellite climate data spanning 1981–2025 (45 years). The averages describe the long-term climate of Anchorage and Portland, not a single year's weather or a short-range forecast.
