A curfew has been set between 7pm and 6am.
In a statement, the ministry said due to the unpredictable political situation, civil unrest and threat from terrorism, New Zealanders should not visit Egypt unless it is essential.
"New Zealanders currently in Egypt are advised to avoid all protests and large public gatherings, exercise a high degree of security awareness in public places and adhere to any instructions issued by the local authorities.
New Zealanders in Egypt are strongly advised to register their details with the Ministry of Foreign Affairs and Trade via www.safetravel.govt.nz.
A spokesman for the ministry said there are currently 220 New Zealanders registered as being in Egypt.