By Doug Schneider

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The start of the 24 Hours of Le Mans will be covered by clouds as an upper level trough and a surface cold front will be moving toward the area. Here's a look at the radar and satellite image at 1:30 pm:

Although the rain over Brittany is moving east and looks pretty solid now, it is expected to break up more as it approaches Le Mans. So I don't expect it to have much impact. If there is a shower this afternoon, it will be very light and short-lived. There may not even be enough to measure, maybe just a trace, which wouldn't even require a change to rain tires. 

Clouds will be decreasing in the evening, with partly cloudy skies by sunset. Temperatures overnight will fall into the upper 50s F or mid teens C. Mostly to partly cloudy skies can be expected from sunrise tomorrow through the end of the race, with no precipitation expected.

By Doug Schneider

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The weather for Le Mans continues to progress as expected, and there hasn't been much change needed to the forecast today. The small chance of a shower on Saturday should not have an impact on the race.

There have been showers near the northern coast of France today, but they have stayed north of Le Mans. On Friday the weather pattern will feature a stationary low pressure system to the north of Ireland, and another moving from the western Mediterranean Sea to eastern France. The second low will bring rain to central and eastern France, but I expect that it will stay far enough away from Le Mans that I can keep the forecast dry. The weather for Friday's parade should be really nice, with mostly sunny skies and temperatures in the lower 70s F or lower 20s C. 

On Saturday the low pressure system to the north will bring a cold front and upper level trough across northern France. As it approaches Le Mans, it will be losing its punch and only a few isolated showers are expected in the area. If one of these showers does hit the track, it will likely be too light to have much impact, and they may arrive before the race begins. The most likely time for any showers is around noon, give or take a couple hours. Winds will be stronger on Saturday, blowing from the southwest at 10 to 15 mph or 16 to 24 km/h. 

High pressure will build over France on Sunday, providing nice weather for the finish and pleasant afternoon temperatures in the mid 70s F or lower 20s C. 

Sunrise at Le Mans is around 6 am, and sunset is around 10 pm. 

I'll have a more detailed forecast through the race posted on Saturday before the start.

By Doug Schneider

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Today will be a wet start to the 24 Hours of Le Mans activities, but the good news is that the forecast is looking better for drier weather on Thursday and Friday, while the weekend continues to look good for racing overall. 

Rain is spreading across northern France early this morning as a low pressure system is sitting over the region. It will move very little through today, so there will be periods of showers on and off all day long. Thunderstorms may be possible at times as well. I don't think the rain will be heavy enough to stop the practice and qualifying sessions, with a quarter to a half inch of rain expected (7 to 13 mm). However, if there is thunder in the area, then there could be some stoppages. That chance is fairly low, maybe 20 to 30%. 

The low will begin a northward drift on Wednesday night. As it does so, the chance of rain will begin to decrease. The system will be located over England on Thursday, so there could still be some showers across northern France that may affect Le Mans. I put the chance of that happening at 40%. If there is a shower on Thursday, I expect that it will be fairly light and brief, with little impact on the action.

Friday is looking better as the low is expected to be north of Ireland, with high pressure over the Alps building in. This should provide a dry day with warmer temperatures in the lower 70s F or lower 20s C.

On Saturday a trough rotating around the low pressure system to the northwest will pass across northern France. This could bring a few showers to the Le Mans area. The chance of one at the track is low, just 20%, and if it does happen it should be short-lived and light with little to no impact on the race. 

​I expect that Sunday will be dry, although there are some models that show some light showers popping up during the day. I'm not ready to go with that yet, so I'm keeping my forecast dry. Hopefully that holds up as we get closer to the weekend. 

By Doug Schneider

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The days leading up to the race weekend at Le Mans are likely to see a good amount of rain, but the good news is that the pattern is expected to change in time for the race.

A slow-moving low pressure system will be stalled over western France for the first half of the week. As I type this, showers and thunderstorms are occurring in the Le Mans area. With the low basically stationary, periods of showers and thunderstorms will continue through Monday and Tuesday, and likely through Wednesday and possibly Thursday as well. The weather map below shows one model's depiction of the pattern on Wednesday.

By Doug Schneider

Early this morning, a cold front is crossing Belgium. As the front moves through, colder air at the surface will move in, dropping temperatures into the mid 30s. This will result in snow falling at Spa-Francorchamps this morning. Since temperatures are expected to hover just above freezing, it will be difficult for any snow to accumulate on the ground. At best, there may be a light dusting of snow on the grass around sunrise. The snow is expected to end sometime between 9 am and 11 am as some drier air aloft moves in behind the front. There will likely be a lull in any precipitation for a few hours as the pre-race ceremonies take place, and I expect that the start of the race will be dry, although some sprinkles will be possible at times. However, an upper level trough will be moving over the area in the afternoon, which will bring a return of some rain. I expect that this rain will remain quite light, with only a few hundredths of an inch or a couple millimeters expected to fall through the day. While the track will be wet and rain tires will be needed, I think the race should be able to run without significant impacts or delays - thus, I have put in green flags for the Impact. Toward the end of the race, rain will likely taper off or come to an end. Temperatures will be cold all day, never rising above the lower to mid 40s F or single digits C.