Yes they are. It averages at about 15°C/59°F. You won't get freezing temperatures so there would not be any problems travelling. Ireland's weather is unpredictable, but September is not a bad month to travel in Ireland. You will be likely to get rain at some point, but no extreme cold or extreme heat.
About 15°C, but it can be a lot higher sometimes. Check the site below for more details on Ireland's weather and climate.
Ireland tends to be fairly warm in May, though not very hot. It depends what temperatures you are used to. You could get temperatures in the 20s Centigrade which is in the 70s Fahrenheit. It could be a lot cooler though. Also bring some rainwear, as it can rain at any time in Ireland.
Wales has similar average summer temperatures to the rest of Britain and Ireland, warm but not as hot as Mediterranean countries.
Ireland's weather can vary a lot from year to year. In September temperatures can often exceed 20°C, but on other years it would be cooler. Throughout any given September you would get a variety of temperature and weather conditions. So it can be warm and dry on some days, and other times much cooler with rain and wind.
Ireland tends to be fairly warm in May, though not very hot. It depends what temperatures you are used to. You could get temperatures in the 20s Centigrade which is in the 70s Fahrenheit. It could be a lot cooler though. It would not be below freezing. It is good to bring a variety of clothes. Also bring some rainwear, as it can rain at any time in Ireland. Tralee is in the southwest and not far from the Atlantic, so it can be wet.
On the coast, the temperatures can be in the 70's (F). Not exactly hot, but warm. Also, the month of September can have a wet climate, cooling it off slightly.
In December, the state of Florida typically experiences warm temperatures.
As is the case with Irish weather generally, it can vary. It can be quite warm and dry some years and other years it can be wet. See the link for details on recent years weather in September.
Warm air, which brings warm temperatures.
warm temperatures
Warm and moist