The total number of malaria cases recorded till July 22 has shot up to 230 while the chikungunya cases stand at 195, it said.
Authorities fear the cases may rise as the season for the vector-borne diseases begins from mid-July and generally lasts till November-end.
Cases of all the three vector-borne diseases have been reported much earlier this time, which doctors have attributed to early arrival of monsoon.
Of the 195 chikungunya cases, 127 of the affected people were residents of Delhi while the rest of the cases were from other states, it said.
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Forty-three cases of dengue have been reported this month, while 15 were recorded in June.
Dengue and chikungunya are caused by the aedes agypti mosquito, which breeds in clear water. The anopheles mosquito, which causes malaria, can breed in both fresh and muddy water.
All the three municipal corporations have stepped up awareness drives -- distributing pamphlets and plying vehicles with loudspeakers issuing dos and don'ts on prevention of the diseases.
The Delhi government had on June 23 issued instructions to state-run and private hospitals and nursing homes to increase their bed capacity by up to 20 per cent for the next six months to deal with a possible outbreak of dengue and chikungunya.
The government has banned over-the-counter sale of nonsteroidal anti-inflammatory drugs such as aspirin and brufen as their use may "pose a threat" to dengue and chikungunya patients.
Though the season of vector-borne diseases had ended in December, the city continued to report such cases, prompting authorities to prepare a combat plan.
Six cases of dengue were reported in January, four in February, 11 in March and as many in April.
As many as 4,431 cases of dengue were reported till the end of 2016.
On May 13, Kejriwal chaired a high-level meeting of officers from the three municipal corporations and the Delhi government to discuss plans to eliminate vector-borne diseases in the national capital.
Till January 14, only two chikungunya cases were reported, while no dengue case had been diagnosed till then.
At least 15 fatalities were reported last year at various hospitals in the city due to complications triggered by chikungunya though the civic bodies have kept the death tally at zero.
At least 21 deaths due to dengue were reported last year at various hospitals, including nine at AIIMS, though the official tally of the SDMC stood at 10.
In one of the worst outbreaks, a total of 12,221 chikungunya cases were reported in Delhi till December 24, 2016, out of which 9,749 were confirmed.
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