Staying outdoors aids in reducing risks of infection, but heat has a trivial effect on the virus. With the recent rise in temperatures and more people now gathering outdoors as restrictions have reduced, experts gave explanations of how much impact the weather has on Covid-19. (Photo : Getty Images) Hot Weather and Covid-19 Studies reveal that the season, and the temperature, have an impact on the spread of covid-19 but that impact is negligible. A member of the UK's Scientific Advisory Group for Emergencies, or Sage, Prof John Edmunds, says the proof discloses that warmer temperatures affect spread but that the impact is minimal because most transmission takes place indoors.