Shannon Weather & Climate: Best Time to Visit

In Shannon, seasonal changes bring about a moderate variation in temperatures. 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 10°C (50°F).

At night, temperatures range from around 12°C (54°F) in July to 3°C (37°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Shannon has a notably wet climate with abundant precipitation, recording 1127 mm (44 in) of rainfall per year. Despite minor fluctuations, Shannon enjoys fairly consistent precipitation throughout the year. In December, you can expect around 111 mm (4.4 in) of precipitation, while in May, Shannon receives about 83 mm (3.3 in). For more details, please visit our Shannon Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Shannon can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 6.1 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.5 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Shannon.

The city experiences its highest humidity in December, reaching 83%. In April, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year