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M87 has been monitored with a cadence of 5 days over a 9 month-long spanthrough the near-ultraviolet (NUV:F275W) and optical (F606W) filters of theWide Field Camera 3 (WFC3) of the $\textit{Hubble Space Telescope}$. Thisunprecedented dataset yields the NUV and optical light and color curves of 94M87 novae, characterizing the outburst and decline properties of the largestextragalactic nova dataset in the literature (after M31 and M81). We test andconfirm nova modelers' prediction that recurrent novae cannot erupt morefrequently that once every 45 days; show that there are zero rapidly recurringnovae in the central $\sim$ 1/3 of M87 with recurrence times $ < $ 130 days;demonstrate that novae closely follow the K-band light of M87 to within a fewarcsec of the galaxy nucleus; show that nova NUV light curves are asheterogeneous as their optical counterparts, and usually peak 5 to 30 daysafter visible light maximum; determine our observations' annual detectioncompleteness to be 71 - 77\%; and measure the rate Rnova of nova eruptions inM87 as $352_{-37}^{+37}$/yr. The corresponding luminosity-specific classicalnova rate for this galaxy is $7.91_{-1.20}^{+1.20}/yr/10^{10}L_\odot,_{K}$.These rates confirm that ground-based observations of extragalactic novae missmost faint, fast novae and those near the centers of galaxies. An annual M87nova rate of 300 or more seems inescapable. A luminosity-specific nova rate of$\sim$ $7 - 10/yr/10^{10}L_\odot,_{K}$ in ${\it all}$ types of galaxies isindicated by the data available in 2023.

A 9-Month Hubble Space Telescope Near-UV Survey of M87. I. Light and Color Curves of 94 Novae, and a Re-determination of the Nova Rate