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The days leading up to the race should have good weather for practice, qualifying, and support races. Temperatures will be comfortable for Wednesday through Friday, gradually climbing from the lower to mid 70s F to lower 80s F, under partly cloudy skies each day.
There is agreement among the models that a low pressure system will track from the northern Atlantic to the English Channel over the weekend. This should bring a chance of rain to Le Mans starting late Saturday afternoon. The system will be slow-moving, so the chance of rain will continue Saturday night and Sunday. At this time, it is nearly impossible to pin down the timing more precisely than that. Timing should become more clear later in the week. Temperatures should be warm at the start of the race Saturday afternoon, then become cooler on Sunday behind a cold front.