The good weather we have been having looks set to continue for a few days. The red/orange sky is due to the scattering of the shorter light wave lengths, (blue light), by dust particles whilst the the longer wave lengths (red) are less affected.
As the sun is lower in the sky in the evening, the distance the light travels to the eye is longer, more short length light has been scattered, the longer wavelengths less affected so the sky appears to be red/orange.
A band of high pressure advancing from the west indicates a spell of dry sunny weather. High pressure traps more dust particles and magnifies the effect.
Lovely!
stocks&phlox 
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