Similar to much of northwest Europe, Dublin experiences a maritime climate with mild winters, cool summers, and a lack of temperature extremes. The average maximum January temperature is 8.3 °C (47 °F), while the average maximum July temperature is 19.6 °C (67 °F). On average, the sunniest months are May and June, while the wettest month is December with 73 mm (3 in) of rain, and the driest month is July with 43 mm (2 in). Rainfall is evenly distributed throughout the year.

Dublin records the least amount of rainfall in Ireland, with the average annual precipitation in the city centre being 695 mm (27 in). The main precipitation in winter is rain, however snow showers do occur between November and March. Hail is more common than snow (during winter months). The city experiences long summer days and short winter days. Strong Atlantic winds are most common in autumn. These winds can affect Dublin, but due to its easterly location it is least affected compared to other parts of the country.

• The warmest month is July, with an average temperature range 55–67 °F.
• The coldest month is January, with an average temperature range of 38–47 °F.