Generally, average daily wearther in Islamabad in May is 28 with usual highs being around 36 degrees celsius and a low of 21. The table below has further info:
| Month | Degrees Celsius |
|---|---|
| Temperature | 28 |
| High Temperature | 36 |
| Low Temperature | 21 |
| Sunshine Per Day | 11 |
Useful Links: Islamabad Weather: Average Weather & Yearly Climate