Generally, average temperature in Londonderry through the whole of April is 5. With the average high being 9 and lows being 5 degrees celsius. We have put some more detail below here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 5 |
| High Temperature | 9 |
| Low Temperature | 5 |
Useful Links: Londonderry Weather: Average Weather & Yearly Climate