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We set out to study the atmosphere of WASP-80b, a warm inflated gas giantwith an equilibrium temperature of $\sim$800~K, using ground-based transmissionspectroscopy covering the spectral range from 520~to~910~nm. The observationsallow us to probe the existence and abundance of K and Na in WASP-80b'satmosphere, existence of high-altitude clouds, and Rayleigh-scattering in theblue end of the spectrum.  We observed two spectroscopic time series of WASP-80b transits with theOSIRIS spectrograph installed in the Gran Telescopio CANARIAS, and use theobservations to estimate the planet's transmission spectrum between 520~nm and910~nm in 20~nm-wide passbands, and around the K~I and Na~I resonance doubletsin 6~nm-wide passbands. We model three previously published broadband datasetsconsisting of 27 light curves jointly prior to the transmission spectroscopyanalysis in order to obtain improved prior estimates for the planet's orbitalparameters, average radius ratio, and stellar density.  We recover a flat transmission spectrum with no evidence of Rayleighscattering or K~I or Na~I absorption, and obtain an improved systemcharacterisation as a by-product of the broadband- and GTC-dataset modelling.The transmission spectra estimated separately from the two observing runs areconsistent with each other, as are the transmission spectra estimated usingeither a parametric or nonparametric systematics models. The flat transmissionspectrum favours an atmosphere model with high-altitude clouds over cloud-freemodels with stellar or sub-stellar metallicities.

The GTC exoplanet transit spectroscopy survey VIII. Flat transmission spectrum for the warm gas giant WASP-80