Portland
Maine, USA
Long-term weather forecast
Long-term weather forecast

July weather forecast and climate
Portland, ME

Dusk view of the lit skyscrapers of the Portland city in Maine
Dusk view of the lit skyscrapers of the Portland city in Maine
July is a warm summer month in Portland, Maine, with average temperature ranging between max 78.8°F (26°C) and min 59.4°F (15.2°C).

Temperature

The warmest month is July, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 59.4°F (15.2°C).

Humidity

The average relative humidity in Portland is 75.3%.

Rainfall

In Portland, in July, it is raining for 11 days, with typically 3.6" (91.7mm) of accumulated precipitation. In Portland, during the entire year, the rain falls for 130.9 days and collects up to 47.3" (1200.3mm) of precipitation.

Snowfall

In Portland, during the entire year, snow aggregates up to 61.9" (1572.3mm).

Ocean temperature

In Portland, the average water temperature is 61.3°F (16.3°C).
Note: Swimming in 61.3°F (16.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in July is 15.1h.

Sunshine

July has the most sunshine of the year, with an average of 9.1h of sunshine.

UV index

Months with the highest UV index are June and July, with an average maximum UV index of 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: In July, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the warmest month in Portland?

The warmest month in Portland is July, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 59.4°F (15.2°C).

What is the temperature in July in Portland?

The average high-temperature, in July, is 78.8°F (26°C), while the average low-temperature is 59.4°F (15.2°C).

What is the average humidity in July in Portland?

The average relative humidity in July in Portland, Maine, is 75.3%.

How much does it rain in Portland in July?

In Portland, in July, during 11 rainfall days, 3.6" (91.7mm) of precipitation is typically accumulated.

What is the ocean temperature in July in Portland?

In July, the average ocean temperature in Portland is 61.3°F (16.3°C). For most, swimming in 61.3°F (16.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Portland have in July?

In Portland, Maine, the average length of the day in July is 15.1h.

What month has the most sunshine in Portland?

July has the most sunshine of the year, with an average of 9.1h of sunshine.

How many hours of sunshine does Portland have in July?

The average sunshine in July in Portland, Maine, is 9.1h.

What are the months with the highest UV index in Portland?

June and July, with an average maximum UV index of 8, are months with the highest UV index in Portland, Maine.

What is the UV index reading in July in Portland?

In Portland, Maine, the average daily maximum UV index in July is 8. A UV Index reading of 8 to 10 represents a very high health threat from the exposure to the Sun's UV rays.
Average temperature in July - Portland, ME
  • Average high temperature in July: 78.8°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (31.2°F).

  • Average low temperature in July: 59.4°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (13.4°F).

Average humidity in July - Portland, ME
  • Average humidity in July: 75.3%

The month with the highest relative humidity is September (76.7%).
The month with the lowest relative humidity is February (65.2%).

Average rainfall in July - Portland, ME
  • Average rainfall in July: 3.6"

Wettest months (with the highest rainfall) are October and November (4.9").
The driest month (with the lowest rainfall) is August (3.1").

Average rainfall days in July - Portland, ME
  • Average rainfall days in July: 11 days

The month with the highest number of rainy days is May (12.6 days).
The month with the lowest number of rainy days is September (9.2 days).

Average snowfall in July - Portland, ME
  • Average snowfall in July: 0"

The month with the highest snowfall is January (19.2").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in July - Portland, ME
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (7.9 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in July - Portland, ME
  • Average sea temperature in July: 61.3°F

The best month for swimming (with the highest average sea temperature) is August (63.7°F).
The coldest month (with the lowest average sea temperature) is March (38°F).

Average daylight in July / Average sunshine in July - Portland, ME
  • Average daylight in July: 15.1h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in July: 9.1h

The month with most sunshine is July (Average sunshine: 9.1h).
The month with least sunshine is December (Average sunshine: 4.5h).

Average UV index in July - Portland, ME
  • Average UV index in July: 8

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).