Overnight rain is expected at Aintree with the ground currently good on the Mildmay and hurdle courses and good, good to soft in places on the Grand National track.
Clerk of the course Andrew Tulloch is anticipating around 10 millimetres to fall with showers possible for the rest of the week.
He said on Monday evening: "We have had an overcast day, but with a drying wind, so I am calling it good all round on the Mildmay and hurdle courses and good, good to soft in places on the Grand National course.
"There is rain forecast overnight and through into the early part of tomorrow, totalling around 10mm and finishing around mid-morning. I will assess the going after that. We are forecast showery weather during the week. We will assess on each day.
"We are pleased with where we are. We started watering a week ago and there is plenty of moisture there, but I will see where we are in the morning."