Penarth Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Penarth.
Climate overview of Penarth
Penarth, Glamorgan, United Kingdom, sees big temperature differences between seasons, with July peaking at 21°C (70°F) and January dropping to 9°C (48°F).
The city has a wet climate, receiving around 1054 mm (41 in) of rainfall per year. Despite the high annual total, it has pleasant summers and cold winters. October is the wettest month. The sunniest month is July, with 6.7 hours of sunshine per day on average.
Penarth Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Penarth - and find the best time to visit.
Monthly Temperature in Penarth
Visitors to Penarth can expect significant temperature changes throughout the year. On average, daytime temperatures range from a pleasant 21°C (70°F) in July to a chilly 9°C (48°F) in January.
Nighttime temperatures range from 14°C (57°F) in July to 4°C (39°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Penarth
Penarth is known for its substantial rainfall, with annual precipitation reaching 1054 mm (41 in). The wettest period in Penarth occurs in October, which receives around 108 mm (4.3 in) of precipitation. During the driest month, March, Penarth experiences moderate rainfall, totaling 72 mm (2.8 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate. For more details, please visit our Penarth Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Penarth
In Penarth, summer days are longer and more sunny, with daily sunshine hours peaking at 6.7 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 1.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Penarth
The mean water temperature over the year ranges from 7°C (45°F) in February to 16°C (61°F) in August.
Water temperature over the year
Humidity in Penarth by Month
The city experiences its highest humidity in January, reaching 89%. In June, the humidity drops to its lowest level at 73%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Penarth
The average wind speed over the year ranges from 4 m/s (8 knots) to 5 m/s (10 knots). It is lower in May, June, July, August and September and higher in January, February, March, April, October, November and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Penarth
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and August
- Warmest weather: July and August
- Most sunshine: May, June and July
- Warmest water temperature: July, August and September, although the water may still feel cool.
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Penarth
What is the best time to visit Penarth?
July and August typically offer the most optimal weather in Penarth. In contrast, January, February, November and December tend to have less optimal conditions. Penarth has pleasant summers and cold winters.
What temperatures can I expect in Penarth?
Daytime highs range from 9°C (48°F) in January to 21°C (70°F) in July. Nighttime lows range from 4°C (39°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Penarth get?
Annual rainfall is around 1054 mm (41 in). October is the wettest month with 108 mm (4.3 in), while March is the driest with 72 mm (2.8 in).
How sunny is Penarth?
Penarth receives around 1,573 hours of sunshine per year. July is the sunniest month with 202 hours, while December is the cloudiest with just 49 hours.
Penarth 3-Day Forecast
Penarth on the map
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