Observers have warned the new election could bring even more tension to a country where politics is largely divided along tribal lines.
The move to nullify an election was unprecedented on the African continent. "This is a precedent-setting ruling", he said.
The six-judge bench ruled 4-2 in favour of the petition filed by Odinga.
The Independent Electoral and Boundaries Commission declared Kenyatta the victor last month by a margin of more than 1.4 million votes, with around 19 million eligible voters.
The court did not place any blame on Mr Kenyatta or his party.
Raila Odinga, the leader of the opposition party National Super Alliance (NASA), had alleged widespread fraud in the August 8 vote, including the hacking of the electoral commission's computer system. Almost 80 percent of the 19 million registered voters cast their ballots.
It was a ruling in favor of the petitioners, Odinga and his NASA coalition, who have argued that a hacked voting system made for a "stolen election".
Maraga added: "The first respondent (the Independent Electoral and Boundaries Commission) failed, neglected or refused to conduct the presidential election in a manner consistent with the dictates of the constitution".
A lawyer for President Kenyatta said the decision had been "very political" but had to be respected.
"This was a tremendous moment for Kenyan democracy, where the court upheld the rule of law".
His opponent, President Uhuru Kenyatta, won an election that global observers had praised as orderly and fair; Odinga's refusal to accept defeat seemed graceless and, given Kenya's history of political violence, dangerous.
He has implored all candidates, political parties and coalitions to exercise their leadership to encourage their supporters and population as a whole to fully accept the judgment of the Supreme Court.
Kenya has seen widespread unrest since the election, and human rights groups said at least 24 people had died at the hands of police since the vote, ITV News reported.
Instead, opposition supporters exploded in celebration. "I'm telling, God is on our side".
He said: 'The court has made its decision. Though he conceded "little aberrations here and there", he said the election was not rigged.
In 2007, following his defeat, more than 1,000 people died in violent clashes across the country.
He and his wife, Sarah, were forced to file for bankruptcy, and he began a long struggle to pay off his taxes and creditors. Berman and his wife adopted a son, Joshua, as well, who died of a brain tumor in 1977 at the age of 12.
It shut down Wednesday as Harvey made a third landfall in southwest Louisiana, bringing flooding to the Port Arthur area. He continued, "As gas prices go up refineries around the globe are seeing incentives to send gas to the United States".
NOTES: Toronto 1B Justin Smoak (calf) sat out, and 3B Josh Donaldson also did not play, just to give him a day off. Using a sharp slider, Sabathia struck out six. "I think it's who he is and what's made him so great for so long".
USA officials worry that if Pakistan becomes an active foe, it could further destabilise Afghanistan and endanger US soldiers. According to sources at Foreign Office (FO), Islamabad is not in favour of worsening its relations with the US.
Returning Russian cosmonaut Fyodor Yurchikhin has logged even more time in orbit: 673 days over five missions. Their Soyuz capsule landed in Kazakhstan shortly after sunrise Sunday, Saturday night back in the U.S.
Twenty-two percent (22%) believe most GOP senators are more likely to agree with their Democratic peers, while 16% are not sure. About Trump's Springfield appearance, Allman said "if you're a Republican and you avoid being there we're taking your name".
They could use funds to help care for these animals as well as local friends who would be willing to take in a foster pet. As now tropical storm Harvey returns to land in Louisiana, the rescue and cleanup effort continues in Houston.
Spurs have reportedly spent £12.1 million for the 32-year-old Llorente and is having his medical examination done today. However, they are now willing to do business with Wilfried Bony linked with a return to the Liberty Stadium.
"We had an idea that the bulk of the money would come back but the present 99 percent is a surprise for most of us", he said. The old notes were allowed to be deposited in banks, with unusual deposits coming under income tax scrutiny.
Lenovo's Mixed Reality Headset Is Called The Explorer
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Buhari Congratulates 'Impressive' Super Eagles
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Shock as Kenya court cancels election result, demands re-run
However, violence broke out as opposition activists cried foul in days of unrest which claimed the lives of at least 28 people. During the ruling, Maraga said the court found no evidence of misconduct on the part of the third respondent who is Kenyatta.
Thomas Lemar Breaks Silence After Failed Arsenal Move
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US Factory-Sector Activity Hits Six-Year High
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UK Markit August mftg PMI SA 56.9 vs 55.0 exp
The FTSE 100 was marginally higher at the start of the new month, and in midmorning trading stood at 7428. Sustained growth in new orders led firms to expand their production schedules again in August.