Weather in Portland

Stay up to date with the actual weather in Portland. In this section, we have gathered the latest data, detailed forecasts, and clear weather charts for you.

Portland, located in the United States, features a temperate climate with distinct seasons. This means the weather here changes throughout the year, offering diverse conditions for travellers, yet generally remains quite comfortable for a visit.

Summer in Portland, especially the months of July and August, will delight you with warmth and an abundance of sunny days. The average temperature during this period hovers around 21-22°C, while the maximum can reach nearly 30°C. Rainfall in summer is minimal, making it the ideal time for walks and outdoor activities. Winters here are typically mild and quite damp, with average temperatures around 5-6°C and frequent rain, particularly from November to March.

Spring and autumn serve as pleasant transitional periods with moderate temperatures and changeable weather. A characteristic feature of Portland's climate is the noticeable contrast between the dry and sunny summer and the wet, rainy winter. The highest amount of precipitation and, consequently, cloudy days falls during the period from late autumn to early spring, while summer offers plenty of clear days for exploring the city and its surroundings.

The climate in Portland demonstrates a clear shift of seasons with noticeable temperature fluctuations throughout the year. The hottest month is August, when the average temperature is 22.1°C, and daily highs regularly reach 29.4°C. The coolest month is considered to be February, with an average temperature of 5.1°C and average minimum night-time temperatures dropping to 1.5°C. Overall, the annual range of average temperatures spans from approximately 5°C in winter to 22°C in summer, providing a variety of weather conditions.

Summer months, particularly July and August, are characterised by warm and often hot days. Average maximum temperatures during this period range from 23.6°C in June to 29.4°C in August. However, nights bring pleasant coolness: minimum temperatures drop to 11.4°C - 14.8°C. Such a significant daily temperature difference, reaching 12-15°C, makes summer evenings especially comfortable after the daytime heat. May and September also offer very pleasant warm weather with daily highs around 20-25°C and noticeable but comfortable night-time cooling.

Winter in Portland, covering the period from December to February, is distinguished by cool, but generally mild weather. Average daily temperatures in these months hold in the range of 7.9°C - 8.8°C, while night-time lows fluctuate between 1.5°C and 3.0°C. Although the temperature can drop close to the freezing point, severe frosts are atypical. Daily temperature fluctuations in winter are less pronounced than in summer, averaging 5-7°C. Transitional months, such as March, April, October, and November, demonstrate a gradual change in temperatures, connecting the cool and warm seasons.

In Portland, there is a pronounced seasonality in the distribution of precipitation throughout the year, creating a clear division into wet and dry periods. The city experiences a distinct rainy season, which falls predominantly on the autumn-winter months, and a noticeably drier summer period. Spring and early autumn serve as transitional stages, demonstrating a gradual change in the amount of precipitation and the frequency of rainy days.

The highest amount of precipitation in Portland falls from late autumn to the end of winter. January and December stand out as the wettest months: on average, 8 mm of precipitation is recorded in each, while the number of rainy days reaches 20-21. November and February are also characterised by a significant amount of precipitation (7 mm and 6 mm respectively) and a high number of days with rain – about 18 days in each. Given the moderate amount of millimetres distributed over many days, precipitation in these months typically takes the form of prolonged rains. Even in March and April, a fairly high probability of precipitation remains, with 19 and 17 rainy days respectively, although the total amount of precipitation decreases somewhat.

Summer months, conversely, are the driest in Portland. July and August are the peak of the dry season, when precipitation is practically absent (on average 0 mm), and the number of rainy days is minimal, amounting to just 2-3 days. This creates ideal conditions for outdoor activities and enjoying sunny weather. May, June, and September are also characterised by low rainfall levels (about 2 mm) and significantly fewer rainy days compared to the winter period – from 8 to 11 days, which makes them also quite pleasant for visiting.

When planning a trip to Portland, it is important to consider its changeable climate and prepare a wardrobe suitable for various weather conditions. The key principle is layering, as even within a single day, the temperature can change noticeably. Regardless of the season, comfortable walking shoes will be your best friend, as Portland invites long walks. Also, do not forget a backpack or bag where you can put a removed layer of clothing or an umbrella.

If your journey falls during the period from late autumn to early spring (approximately from October to April), be prepared for frequent rains and cool weather. Be sure to take a waterproof jacket with a hood or a raincoat, as well as an umbrella. Waterproof footwear will also be very handy. Warm items, such as sweaters, fleece jackets, and warm trousers, will help you feel comfortable at average temperatures from 5°C to 12°C. In the winter months (December-February), a hat, gloves, and a scarf may also be needed, especially in the evenings when the temperature drops closer to zero.

Summer months (June-August) in Portland are usually warm and sunny, with minimal precipitation. You will need light clothing: T-shirts, shorts, dresses, sandals. However, even in summer, evenings can be cool, so a light jacket or sweater will come in handy. Do not forget sunscreen, sunglasses, and headwear for sun protection, especially if you plan to spend a lot of time outdoors. In the transitional seasons – late spring (May) and early autumn (September) – the weather can be very pleasant but changeable, so the principle of layering and having a light jacket or windbreaker will remain relevant.