Merton Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Merton.
Climate overview of Merton
Merton, Devon, United Kingdom, has a moderate seasonal temperature range, with July reaching 20°C (68°F) and January cooling to 9°C (48°F).
With around 1017 mm (40 in) of annual rainfall, Merton has a notably wet climate. However, this rainfall is not evenly distributed — the city has pleasant summers and cold winters. The wettest month is December. The sunniest month is May, with 6.6 hours of sunshine per day on average.
Merton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Merton - and find the best time to visit.
Monthly Temperature in Merton
The climate in Merton experiences moderate temperature changes, with mild shifts between seasons. Average daytime temperatures reach a pleasant 20°C (68°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 9°C (48°F).
At night, temperatures range from around 13°C (55°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 Merton
Merton is known for its substantial rainfall, with annual precipitation reaching 1017 mm (40 in). Despite minor fluctuations, Merton enjoys fairly consistent precipitation throughout the year. In December, you can expect around 104 mm (4.1 in) of precipitation, while in March, Merton receives about 73 mm (2.9 in). For more details, please visit our Merton 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 Merton
Merton can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 6.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.8 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Merton
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
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Merton
What is the best time to visit Merton?
July and August typically offer the most optimal weather in Merton. In contrast, January, February and December tend to have less optimal conditions. Merton has pleasant summers and cold winters.
What temperatures can I expect in Merton?
Daytime highs range from 9°C (48°F) in January to 20°C (68°F) in July. Nighttime lows range from 4°C (39°F) to 13°C (55°F).
How much rain does Merton get?
Annual rainfall is around 1017 mm (40 in). December is the wettest month with 104 mm (4.1 in), while March is the driest with 73 mm (2.9 in).
How sunny is Merton?
Merton receives around 1,552 hours of sunshine per year. May is the sunniest month with 197 hours, while December is the cloudiest with just 53 hours.
Merton 3-Day Forecast
Merton 3-Day Forecast
Merton on the map
Merton is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
London
23°C (73°F) Bath22°C (72°F) York22°C (72°F) Manchester
21°C (70°F) Edinburgh
19°C (66°F) Glasgow19°C (66°F) Torquay20°C (68°F) Blackpool19°C (66°F) 
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