Frequent average weather in Heathrow right through May is 11. With the average high being 17 degrees celsius and a low of 8. We have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 11 |
| High Temperature | 17 |
| Low Temperature | 8 |
| Sunshine Per Day | 7 |
Useful Links: Heathrow Weather: Average Weather & Yearly Climate