Wa `alaykum as-salamu wa rahmatullah

In the Name of Allah, the All-Merciful, the Mercy-Giving

All praise is due to Allah. Peace and blessings be upon our Prophet Muhammad.

Istikharah is a kind of du`a’ with a special formula prescribed by the Messenger of Allah (peace and blessings be upon him). In general, if one knows Arabic and can say the du`a’ in Arabic, he/she may not use any other language. However, if one cannot say it in Arabic, he/she may say it in any other language. Allah SWT is All-Hearing and All-Knowing.

Almighty Allah knows best.