Climate and monthly weather forecast
Weather in January
In Runcorn, United Kingdom, in January, the average water temperature is 7.7°C (45.9°F). Note: Unprotected swimming in 7.7°C (45.9°F) is dangerous due to potential cold shock. Weather in January »
Weather in February
The months with the coldest seawater in Runcorn, United Kingdom, are February and March, with an average sea temperature of 7.4°C (45.3°F). Note: Swimming in 7.4°C (45.3°F) at temperatures under 10°C (50°F) requires thermal swimsuits; otherwise, one can face cold shock and breathing difficulty. Weather in February »
Weather in March
The months with the coldest seawater in Runcorn, United Kingdom, are February and March, with an average sea temperature of 7.4°C (45.3°F). Note: Being in 7.4°C (45.3°F) waters at 13°C (55.4°F) is discomforting, but anything below 10°C (50°F) can jeopardize breathing and induce cold shock, factoring in physical endurance. Weather in March »
Weather in April
In Runcorn, United Kingdom, the average seawater temperature in April is 8.9°C (48°F). Note: Without suitable protection, venturing into 8.9°C (48°F) waters cooler than 10°C (50°F) can lead to pronounced cold shock and rapid breaths. Weather in April »
Weather in May
In Runcorn, United Kingdom, in May, the average water temperature is 10.9°C (51.6°F). Note: Danger awaits those who swim in 10.9°C (51.6°F) without protection. Weather in May »
Weather in June
In Runcorn, United Kingdom, the average seawater temperature in June is 13.4°C (56.1°F). Note: One needs to be cautious in 13.4°C (56.1°F) waters. 13°C (55.4°F) is already forbidding, but sub-10°C (14°F) can seriously disrupt your breathing and lead to a frigid shock, considering one's well-being. Weather in June »
Weather in July
In Runcorn, United Kingdom, in July, the average water temperature is 15.6°C (60.1°F). Note: Swimming in water at 15.6°C (60.1°F) is not a pleasurable experience for most. Weather in July »
Weather in August
With an average sea temperature of 16.7°C (62.1°F), August is the month with the warmest seawater in Runcorn, United Kingdom. Note: Most people do not enjoy swimming in water that is 16.7°C (62.1°F). Weather in August »
Weather in September
In September, the average sea temperature in Runcorn, United Kingdom, is 16.2°C (61.2°F). Note: Most individuals do not find swimming at 16.2°C (61.2°F) to be enjoyable. Weather in September »
Weather in October
In Runcorn, United Kingdom, in October, the average water temperature is 14.6°C (58.3°F). Note: Swimming in 14.6°C (58.3°F) is considered dangerous. Weather in October »
Weather in November
In Runcorn, United Kingdom, in November, the average water temperature is 12.4°C (54.3°F). Note: Swimming in 12.4°C (54.3°F) is considered dangerous. Weather in November »
Weather in December
In Runcorn, United Kingdom, in December, the average water temperature is 9.7°C (49.5°F). Note: One needs to be cautious in 9.7°C (49.5°F) waters. Weather in December »
Updated: Jul 11, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What months are the sea coldest in Runcorn?
The months with the coldest seawater are February and March, with an average sea temperature of 7.4°C (45.3°F).
When are the longest days?
With an average of 16h and 54min of daylight, June has the longest days of the year.
When is the sea warmest?
August is the month with the warmest seawater, with an average sea temperature of 16.7°C (62.1°F).
When is Daylight Saving Time (DST)?
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 7h and 36min of daylight.
Average sea temperature
Runcorn, United Kingdom
The best month for swimming (with the highest average sea temperature) is August (16.7°C).
The coldest months (with the lowest average sea temperature) are February and March (7.4°C).
Average daylight
Runcorn, United Kingdom
- Average daylight in January:
8h and 1min - Average daylight in February:
9h and 5min - Average daylight in March:
11h and 5min - Average daylight in April:
14h and 0min - Average daylight in May:
15h and 5min - Average daylight in June:
16h and 5min
- Average daylight in July:
16h and 2min - Average daylight in August:
14h and 4min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
8h and 4min - Average daylight in December:
7h and 4min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
