Frequently the weather in Cupertino in June is 18 with a normal high in the month being 26 and typical average low being around 13 celsius. The table below includes more detail:
| Month | Degrees Celsius |
|---|---|
| Temperature | 18 |
| High Temperature | 26 |
| Low Temperature | 13 |
Useful Links: Cupertino Weather: Average Weather & Yearly Climate