Attacks by Boko Haram since late May have emptied the towns of Bosso and Yebi near the Nigeria border in the Lake Chad region.
Some 69,000 have fled, according to a report on Friday by the UN Office for the Coordination of Humanitarian Affairs (OCHA).
"Despite the various extensions of the state of emergency in the region of Diffa and bloody setbacks inflicted on it, the Boko Haram sect still continues to have a destructive capacity as evidenced by the recent attacks in Bosso," the government said in a statement.
Boko Haram kills 24 women at a funeral in Nigeria
Boko Haram took the town of Bosso near the Nigerian border in early June, in an attack that killed 30 soldiers from Niger and two.
It was the deadliest assault in Niger by Boko Haram since April 2015. Since then, Chad has sent troops to help Niger wage a counterattack.
The state of emergency, which the government hopes will allow it to beef up its presence in the region with troops and added security measures, will now run to Oct 25. It is the latest in a series of such declarations in the Diffa region
since February last year.
Boko Haram has been trying to establish an Islamic state adhering to strict Sharia law in northeastern Nigeria since 2009.
The violence has since spread into neighbouring Niger, Chad and Cameroon. About 2.1 million people have been displaced
and thousands have been killed during the insurgency.
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