At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Heathrow and Le Mans for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Heathrow is roughly similar to Le Mans. You can assume this to be the case over the next 17 days.
You can imagine temperatures to be in the 27 °C range in August. The weather in Le Mans is generally hotter than Heathrow's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.