Derry, where it's located

The climate of Derry is oceanic, with quite cold, rainy winters and mild, relatively rainy summers.
Derry, or Londonderry, is located in Northern Ireland, a short distance from Lough Foyle, the river estuary that runs through the city and opens up into a bay before flowing into the sea.
The average temperature of the coldest month (January) is of 5.1 °C (41 °F), that of the warmest month (July) is of 15.3 °C (59 °F). Here are the average temperatures.
Derry - Average temperatures
Min (°C)2245710121110742
Max (°C)881012151719181714108
Min (°F)363639414550545250453936
Max (°F)464650545963666463575046

Precipitation amounts to 855 millimeters (33.7 inches) per year: so, it is at an intermediate level. It ranges from 50 mm (2 in) in the driest month (May) to 90 mm (3.5 in) in the wettest ones (October, December). Here is the average precipitation.
Derry - Average precipitation

On average, there are around 1,345 sunshine hours per year. So, the sun doesn't shine often. Here are the average sunshine hours per day.
Derry - Sunshine

The sea temperature ranges between 9 °C (48 °F) and 15 °C (59 °F). So, it is cold all year round. Here are the average sea temperatures.
Derry - Sea temperature
Temp (°C)99991012141514131210
Temp (°F)484848485054575957555450


Best Time

The best time to visit Derry is the summer, from June to August, since it is the mildest of the year. The temperatures are generally good for outdoors activities, although it's better to bring an umbrella, and a sweatshirt or sweater for the evening or for cool days.