Normally, average daily temperatures in Shannon all through September is 12. Through the month the highs are about 17 with low temperatures being around 11. We have provided a clearer breakdown here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 12 |
| High Temperature | 17 |
| Low Temperature | 11 |
| Sunshine Per Day | 5 |
Useful Links: Shannon Weather: Average Weather & Yearly Climate