The best times to visit Portland for ideal weather are

May 14th to October 7th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Portland Travel Info

Weather in Portland

Temperature

Average temperatures in Portland vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 25th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Portland, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 82.6°F (28.1°C) with temperatures rarely dropping below 60.6°F (15.9°C) at night.

Portland Temperatures (Fahrenheit)

Key
High
Average
Low

Portland Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Portland Perceived Temperature (F)

Key
High
Average
Low

Portland Perceived Temperature (C)

Key
High
Average
Low

 

Average Portland Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 35.1 24.2 13.9
Feb 35.9 25.2 14.3
Mar 44.7 34.1 24.1
Apr 57.5 45.3 33.8
May 68.2 55.6 44.5
Jun 74.7 63.1 53.1
Jul 81.5 70 59.9
Aug 80 68.5 58
Sep 73.9 61.7 50.8
Oct 62.5 51.1 40.9
Nov 51.8 40.6 30.6
Dec 40.8 30.9 21.7

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 1.7 -4.3 -10.1
Feb 2.2 -3.8 -9.8
Mar 7.1 1.2 -4.4
Apr 14.2 7.4 1
May 20.1 13.1 6.9
Jun 23.7 17.3 11.7
Jul 27.5 21.1 15.5
Aug 26.7 20.3 14.4
Sep 23.3 16.5 10.4
Oct 16.9 10.6 4.9
Nov 11 4.8 -0.8
Dec 4.9 -0.6 -5.7

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Portland are August, September, and then November. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late August to early September. For example, on the week of August 27th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in late December with an average of 3 days of significant precipitation the week of December 24th.

When can you find snow in Portland? Weather stations report very large amounts of snow likely to be deepest around February, especially close to mid February. The best time to ski (if at all) in Portland is often around around February 12th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Portland.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Portland (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 23% 6.1 3
Feb 24% 10 4.4
Mar 25% 7.7 4.3
Apr 24% 3.7 4.9
May 25% 0 3.4
Jun 33% 0 5.8
Jul 26% 0 4.8
Aug 18% 0 4.8
Sep 19% 0 4.4
Oct 24% 3.9 5.4
Nov 21% 3.1 4.1
Dec 35% 5.9 5.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 23 15.5 7.6
Feb 24 25.4 11.2
Mar 25 19.6 10.9
Apr 24 9.4 12.4
May 25 0 8.6
Jun 33 0 14.7
Jul 26 0 12.2
Aug 18 0 12.2
Sep 19 0 11.2
Oct 24 9.9 13.7
Nov 21 7.9 10.4
Dec 35 15 13.2

 

Humidity and Wind

Portland has some high humidity months, with other comfortably humid months. The least humid month is February (50.2% relative humidity), and the most humid month is August (68.9%).

Wind in Portland is usually calm. The windiest month is March, followed by April and February. March’s average wind speed of around 7.9 knots (9.1 MPH or 14.7 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late March where average top sustained speeds reach 15.4 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Portland.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 6.5 Light breeze 13.7 Significant breeze
Feb 7.3 Gentle breeze 14.4 Significant breeze
Mar 7.9 Gentle breeze 15.1 Significant breeze
Apr 7.6 Gentle breeze 15.1 Significant breeze
May 6.3 Light breeze 13.3 Significant breeze
Jun 5.7 Light breeze 12.2 Significant breeze
Jul 5.5 Light breeze 12.1 Significant breeze
Aug 5.1 Light breeze 11.6 Significant breeze
Sep 5.2 Light breeze 11.5 Significant breeze
Oct 6 Light breeze 12.4 Significant breeze
Nov 6.2 Light breeze 12.7 Significant breeze
Dec 6.4 Light breeze 12.7 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 53.3%
Feb 50.2%
Mar 50.7%
Apr 53%
May 61.1%
Jun 68%
Jul 68.4%
Aug 68.9%
Sep 68.5%
Oct 65.2%
Nov 58.7%
Dec 62.2%

 

Is it Safe to Travel to Portland?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Portland, ME, US is June, followed by August and September. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Portland in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 56.3 in November means 56.3% of the tourists vs. June.

 

 

Overall Portland Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 72.5°F (22.5°C) and 37°F (2.8°C) with far warmer temperatures in the later months. Rain is somewhat common with 7 to 8 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see moderate precipitation with 6 to 10 days of precipitation per month. June – August is the busiest season for tourism in Portland, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 79.6°F (26.4°C) and 46.4°F (8°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 6 to 7 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Portland to be enjoyable for warm weather travelers. The average high during this season is between 43.1°F (6.2°C) and 31.7°F (-0.2°C). On average, it rains or snows a fair amount: 7 to 11 times per month. These times of year are the second busiest with tourists.

 

Best Times to Travel› the United States › Portland, ME, US