A measurement of the Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association with a weak vector boson, and in association with a pair of top quarks. The measurement is performed using {\sqrt{s}=13\,\mathrm{TeV}} proton-proton (pp) collision data, corresponding to an integrated luminosity of {137\,\mathrm{fb}^{-1}}, recorded by the CMS experiment at the CERN LHC. An excess of events is observed in data with a significance of 3.0 standard deviations, where the expectation for the standard model (SM) Higgs boson with {m_{\mathrm{H}} = 125.38\,\mathrm{GeV}} is 2.5. The measured signal strength, relative to the SM expectation, is ${1.19^{+0.41}_{-0.39}(\mathrm{stat})^{+0.17}_{-0.16}(\mathrm{sys})}$. The combination of this result with that from data recorded at centre-of-mass energies of 7 and {8\,\mathrm{TeV}} improves both expected and observed sensitivity by $1\%$. This result constitutes the first evidence for the Higgs boson decay to fermions of the second generation.

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