From your previous post, it would appear this is your first lesson, ie almost a trial flight.
20GT30, on r/way hdg, is not particulary pleasant, but perfectly doable. It will be down to the instructor to determine, however, you want the most out of your flight, and if the conditions are challenging, then you may want to wait until a better day.
IMO it is ok to go up when you have a good few hours under your belt, to experience the choppier conditions, but for a first 'lets go flying', and to check your proficiency, tomorrow may not be the best option.
Then again it could be flat calm...