Shannon Temperature by Month

The average annual maximum temperature in Shannon, Clare, Ireland is 14°C (57°F), with daytime highs ranging from 10°C (50°F) in January to 20°C (68°F) in July. This page covers monthly averages, day-night differences, and how Shannon compares to cities worldwide.

The moderate changes in the climate in Shannon ensure gradual weather shifts through each season. At night, temperatures drop to between 12°C (54°F) and 3°C (37°F) depending on the time of year.

The chart below illustrates the average maximum day and minimum night temperatures in Shannon by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. July, the city's warmest month, gets 138 hours of sunshine.

The chart below shows the average temperature throughout the year:

Shannon's average annual maximum temperature is 14°C (57°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Shannon, January is the coolest month, with average highs of 10°C (50°F) and humidity around 81%, considered very high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Shannon this rarely lasts long on the ground.

For more on Shannon's weather, including monthly rainfall, sunshine hours, and humidity, visit our Shannon climate page.