Portsmouth
United Kingdom
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Portsmouth, United Kingdom

April is a moderate spring month in Portsmouth, United Kingdom, with average temperature fluctuating between 6.1°C (43°F) and 13.2°C (55.8°F).

Temperature

In April, the average high-temperature is practically the same as in March - a moderate 13.2°C (55.8°F). In April, in Portsmouth, the average low-temperature is 6.1°C (43°F).

Rainfall

In Portsmouth, during 7.6 rainfall days, 42.4mm (1.7") of precipitation is typically accumulated. Throughout the year, in Portsmouth, there are 103.4 rainfall days, and 699mm (27.5") of precipitation is accumulated.

Sea temperature

In Portsmouth, in April, the average water temperature is 9.8°C (49.6°F).
Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

Daylight

The average length of the day in Portsmouth is 13.9h.

Sunshine

The average sunshine in April is 6.7h.

UV index

The average daily maximum UV index in April is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in April interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in April in Portsmouth?

In Portsmouth, in April, the average high-temperature is 13.2°C (55.8°F), and the average low-temperature is 6.1°C (43°F).

How much does it rain in Portsmouth in April?

In April, in Portsmouth, the rain falls for 7.6 days. Throughout April, 42.4mm (1.7") of precipitation is accumulated.

How cold is the water in April in Portsmouth?

In Portsmouth, in April, the average water temperature is 9.8°C (49.6°F). Swimming in 9.8°C (49.6°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Portsmouth have in April?

In April, the average length of the day in Portsmouth is 13.9h.

How many hours of sunshine does Portsmouth have in April?

In April, the average sunshine is 6.7h.

How high is the UV index in April in Portsmouth?

In Portsmouth, United Kingdom, the average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in April - Portsmouth, United Kingdom
  • Average high temperature in April: 13.2°C

Warmest months (with the highest average high temperature) are July and August (21.4°C).
Months with the lowest average high temperature are January and February (8.2°C).

  • Average low temperature in April: 6.1°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 April - Portsmouth, United Kingdom
  • Average rainfall in April: 42.4mm

The wettest month (with the highest rainfall) is October (86.2mm).
The driest month (with the lowest rainfall) is June (42mm).

Average rainfall days in April - Portsmouth, United Kingdom
  • Average rainfall days in April: 7.6 days

Months with the highest number of rainy days are January and December (11.2 days).
The month with the lowest number of rainy days is July (5.4 days).

Average sea temperature in April - Portsmouth, United Kingdom
  • Average sea temperature in April: 9.8°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 April / Average sunshine in April - Portsmouth, United Kingdom
  • Average daylight in April: 13.9h

The month with the longest days is June (Average daylight: 16.4h).
The month with shortest days is December (Average daylight: 8h).

  • Average sunshine in April: 6.7h

The month with most sunshine is July (Average sunshine: 8.4h).
The month with least sunshine is December (Average sunshine: 2h).

Average UV index in April - Portsmouth, United Kingdom
  • Average UV index in April: 4

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 1).