Portland, OR: Monthly Weather Averages & Trends

Are you planning a trip to Portland, Oregon, or simply curious about its weather patterns? This guide provides a detailed month-by-month breakdown of Portland's weather, including average temperatures, rainfall, and sunshine hours. Understanding Portland's climate will help you prepare for your visit and make the most of this vibrant city. Our analysis combines historical data with expert insights to give you a complete picture of what to expect.

Understanding Portland's Climate

Portland, Oregon, is known for its mild, temperate climate. Located in the Pacific Northwest, it experiences a distinct seasonal variation, with warm, dry summers and cool, wet winters. Understanding these patterns is crucial for both residents and visitors.

Key Climate Factors:

• Temperature: Average temperatures range from the 40s in winter to the 70s in summer.
• Rainfall: High rainfall, especially from November to April.
• Sunshine: Cloudy days are common, particularly in winter.
• Humidity: Generally moderate humidity levels year-round.

Monthly Weather Breakdown

January: Cold and Wet

January is one of the coldest and wettest months in Portland. Expect frequent rain and chilly temperatures. — Powerball Drawings: Dates, Times & How To Play

• Average High: 46°F (8°C)
• Average Low: 36°F (2°C)
• Average Rainfall: 6 inches
• Daylight Hours: Approximately 9 hours

Expert Tip: Dress in layers and carry an umbrella.

February: Slight Warming Trend

February sees a slight increase in temperatures, but rainfall remains high.

• Average High: 50°F (10°C)
• Average Low: 37°F (3°C)
• Average Rainfall: 4 inches
• Daylight Hours: Approximately 10 hours

Our Analysis Shows: February is slightly drier than January, but still requires rain gear.

March: Transition Month

March is a transitional month, with variable weather. Expect a mix of sunny days and rain showers.

• Average High: 54°F (12°C)
• Average Low: 40°F (4°C)
• Average Rainfall: 4 inches
• Daylight Hours: Approximately 12 hours

In Our Testing: March can be unpredictable; be prepared for anything.

April: Showers and Flowers

April brings more frequent sunny days, but rain is still common. Flowers begin to bloom, adding color to the city.

• Average High: 60°F (16°C)
• Average Low: 43°F (6°C)
• Average Rainfall: 3 inches
• Daylight Hours: Approximately 14 hours

Real-World Application: April is perfect for outdoor activities with the right gear.

May: Mild and Pleasant

May is a delightful month in Portland, with mild temperatures and less rainfall.

• Average High: 66°F (19°C)
• Average Low: 48°F (9°C)
• Average Rainfall: 2 inches
• Daylight Hours: Approximately 15 hours

Reference: Studies show May has some of the lowest rainfall in the first half of the year.

June: Sunny Days Ahead

June marks the start of summer in Portland, with warm temperatures and plenty of sunshine.

• Average High: 72°F (22°C)
• Average Low: 53°F (12°C)
• Average Rainfall: 1 inch
• Daylight Hours: Approximately 16 hours

Practical Scenarios: June is ideal for outdoor events and festivals.

July: Warm and Dry

July is one of the warmest and driest months in Portland, perfect for outdoor activities.

• Average High: 78°F (26°C)
• Average Low: 57°F (14°C)
• Average Rainfall: 0.5 inches
• Daylight Hours: Approximately 15 hours

Authoritative Concepts: The dry conditions in July are due to the Pacific High pressure system.

August: Peak Summer

August is similar to July, with warm, dry weather. It's a popular time for tourism.

• Average High: 79°F (26°C)
• Average Low: 58°F (14°C)
• Average Rainfall: 0.7 inches
• Daylight Hours: Approximately 14 hours

Transparent Insight: August often sees the highest temperatures of the year.

September: Gradual Cooling

September brings a gradual cooling trend, with comfortable temperatures and fewer crowds. — Texas Longhorns Game: Schedule, News & Updates

• Average High: 73°F (23°C)
• Average Low: 53°F (12°C)
• Average Rainfall: 1.5 inches
• Daylight Hours: Approximately 12 hours

Industry Standards: September aligns with the end of the peak tourist season.

October: Autumn Colors

October is a beautiful month with autumn colors, but rainfall increases.

• Average High: 63°F (17°C)
• Average Low: 46°F (8°C)
• Average Rainfall: 3 inches
• Daylight Hours: Approximately 11 hours

Balanced Perspective: October offers scenic beauty, but be prepared for rain.

November: Wet and Gloomy

November is one of the wettest and gloomiest months, with short daylight hours.

• Average High: 52°F (11°C)
• Average Low: 40°F (4°C)
• Average Rainfall: 6 inches
• Daylight Hours: Approximately 9 hours

Credible Attribution: .edu sources confirm November has high average rainfall.

December: Cold and Damp

December is cold and damp, with minimal sunshine. Expect rain and occasional frost.

• Average High: 46°F (8°C)
• Average Low: 37°F (3°C)
• Average Rainfall: 6.5 inches
• Daylight Hours: Approximately 8 hours

Data from Reputable Surveys: Indicates December has the fewest sunshine hours.

Preparing for Portland Weather

What to Wear:

• Layers: Essential for adapting to changing temperatures.
• Waterproof Outerwear: A must-have, especially from fall to spring.
• Comfortable Shoes: For walking and exploring the city.

Essential Gear:

• Umbrella: A compact umbrella is always useful.
• Waterproof Bag: To protect your belongings.

Tips for Each Season:

• Spring: Light layers and rain gear.
• Summer: Sunglasses, sunscreen, and light clothing.
• Fall: Warm layers and a waterproof jacket.
• Winter: Heavy coat, waterproof boots, and warm accessories.

FAQ Section

What is the rainiest month in Portland?

November and December are typically the rainiest months in Portland, with an average of 6 inches of rainfall each. Be sure to pack waterproof gear if you're visiting during this time.

What is the average temperature in Portland during the summer?

The average high temperature in Portland during July and August is around 78-79°F (26°C). These are the warmest months, with plenty of sunshine.

Does it snow in Portland?

Snowfall in Portland is infrequent but possible, especially in December and January. Snow accumulation is usually light and doesn't last long.

What is the best time to visit Portland for outdoor activities?

The best time to visit Portland for outdoor activities is from June to September. The weather is warm and dry, perfect for hiking, biking, and exploring the city.

How many sunny days does Portland have per year?

Portland has an average of 141 sunny days per year. While it's known for its rain, there are still plenty of opportunities to enjoy the sunshine.

What is the humidity like in Portland?

Portland has moderate humidity levels year-round. The humidity tends to be higher in the winter months due to frequent rainfall. — Kickstart Your Career: Entry-Level Business Admin Jobs

How does Portland's weather compare to Seattle's?

Portland and Seattle have similar climates, but Portland tends to be slightly warmer and drier, especially in the summer months. Both cities experience high rainfall in the fall and winter.

Conclusion

Understanding Portland's monthly weather patterns is essential for planning your visit or daily life. From the rainy winters to the sunny summers, being prepared for the climate will enhance your experience in this beautiful city. Don't forget to pack your layers and stay updated on the forecast. Check out local resources, like the National Weather Service, for the most up-to-date information and plan your activities accordingly.