Weather in July
Temperature
July and August bring Portsmouth's highest average temperatures, reaching a high of 21.4°C (70.5°F).Rainfall
In Portsmouth, during July, the rain falls for 5.4 days and regularly aggregates up to 45mm (1.77") of precipitation. In Portsmouth, United Kingdom, during the entire year, the rain falls for 103.4 days and collects up to 699mm (27.52") of precipitation.Sea temperature
In July, the average sea temperature in Portsmouth, United Kingdom, is 15.3°C (59.5°F).Note: Swimming is not enjoyable for most people in water that is 15.3°C (59.5°F). As the temperature descends from 21°C (69.8°F) to 15°C (59°F), breathing control becomes harder.
Daylight
In July, the average length of the day in Portsmouth is 15h and 59min.On the first day of July in Portsmouth, sunrise is at 4:55 am and sunset at 9:21 pm. On the last day of the month, sunrise is at 5:30 am and sunset at 8:51 pm BST.
Sunshine
With an average of 8.4h of sunshine, July has the most sunshine of the year in Portsmouth.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 6 in July translates into the following instructions:
Deflect overexposure. Sun protection is a necessity. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Frequently asked questions
What is the hottest time of year in Portsmouth?
What is the average July temperature in Portsmouth?
How many days does it rain in July in Portsmouth?
How cold is the water in July in Portsmouth?
How many hours of daylight does Portsmouth have in July?
When are sunrise and sunset in July in Portsmouth?
What month has the most sunshine in Portsmouth?
How many hours of sunshine does Portsmouth have in July?
What is the month with the highest UV index in Portsmouth?
How high is the UV index in July in Portsmouth?
Average temperature in July
Portsmouth, United Kingdom
- Average high temperature in July: 21.4°C
The warmest months (with the highest average high temperature) are July and August (21.4°C).
The months with the lowest average high temperature are January and February (8.2°C).
- Average low temperature in July: 14.2°C
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is February (2.8°C).
Average rainfall in July
Portsmouth, United Kingdom
- Average rainfall in July: 44.5mm
The wettest month (with the highest rainfall) is October (86.2mm).
The driest month (with the least rainfall) is June (42mm).
Average rainfall days in July
Portsmouth, United Kingdom
- Average rainfall days in July: 5.4 days
The months with the highest number of rainy days are January and December (11.2 days).
The month with the least rainy days is July (5.4 days).
Average sea temperature in July
Portsmouth, United Kingdom
- Average sea temperature in July: 15.3°C
The best month for swimming (with the highest average sea temperature) is September (17.3°C).
The coldest month (with the lowest average sea temperature) is March (8.6°C).
Average daylight in July /
Average sunshine in July
Portsmouth, United Kingdom
- Average daylight in July: 16h and 0min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in July: 8h and 2min
The month with the most sunshine is July (Average sunshine: 8h and 24min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average UV index in July
Portsmouth, United Kingdom
- Average UV index in July: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Portsmouth, United Kingdom
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