Portland in January
January in Portland is peak summer, and the weather reflects it. You're looking at average daily highs of 21.2 degrees.
The average daily maximum is 21.2 degrees with overnight lows of 14.6 degrees. That's solidly pleasant territory. Great for being outdoors.
January is 3.3 degrees warmer than the yearly average here.
Rainfall in January averages 71mm over about 12 days. That means roughly a 40% chance of rain on any given day, pack a compact umbrella just in case.
Sunshine-wise, January delivers around 22.7 MJ/m2 of daily solar radiation. UV sits in the extreme category. Sunscreen, hat, and sunnies are all essential. You can burn in under 10 minutes.
Our Comfort Score rates January at 8.2/10. That's about as good as it gets.
For your suitcase: a decent jumper or fleece, a rain jacket or compact umbrella, and serious sun protection.
The full data breakdown is below. You can also see how other Australian cities compare in January.
January at a Glance
Temperature Range
Daily temperature range in January. The bar shows the typical spread between overnight lows and afternoon highs.
What to Pack
- Layered clothing for mild to cool conditions
- A waterproof jacket or compact umbrella
- High SPF sunscreen (50+), sunglasses, and UV-protective clothing
Coming From Overseas?
How January in Portland stacks up against major cities around the world.
About 13 degrees warmer and considerably wetter.
About 17 degrees warmer and considerably drier.
About 11 degrees warmer and considerably wetter.
How January Compares
Portland's monthly climate at a glance. January is highlighted.
| Month | Max | Min | Rain | Comfort |
|---|---|---|---|---|
| Jan | 21.2 | 14.6 | 71mm | 8.2 |
| Feb | 22.2 | 13.5 | 5mm | 10.0 |
| Mar | 21.9 | 13.7 | 14mm | 9.2 |
| Apr | 16.9 | 11.3 | 54mm | 4.0 |
| May | 15.9 | 9.7 | 23mm | 3.5 |
| Jun | 13.2 | 7.6 | 37mm | 1.5 |
| Jul | 13.0 | 7.4 | 84mm | 1.0 |
| Aug | 16.2 | 9.4 | 70mm | 3.4 |
| Sep | 14.8 | 10.0 | 90mm | 2.3 |
| Oct | 17.7 | 10.4 | 68mm | 5.6 |
| Nov | 19.8 | 12.0 | 91mm | 7.1 |
| Dec | 21.5 | 13.2 | 41mm | 9.1 |