Rain is the enemy of the Halloween costumes for the children going door to door.

Whether it’s ghoulish makeup that can run or paper costume elements that can wilt away under falling rain, there are many reasons to be wary of precipitation on Oct. 31.

Environment Canada is forecasting rain all morning, with the CBC’s Michelle Leslie reporting that steady rainfall can be expected throughout the rest of the day and evening.

Leslie says that it’s expected to be a very windy day as well, with winds gusting at 50 to 70 km/h.

As for the temperature, Leslie says the temperature could stand as high as 16 C by 6 p.m., when early trick-or-treaters will be hitting the streets.

That means that despite the rain, it could be the city’s warmest Halloween in several years.

According to historical data accessible on the Environment Canada website, Toronto has not seen a Halloween where the temperature rose higher than 9 C in four years.

Last year, the Toronto City Centre data showed the temperature resting between 7 C and 8.6 C, for much of the day and evening.

That was only slightly different than in 2011, when the temperature held steady at 8 C on Halloween night.

The temperature fell to just above the freezing mark as the evening progressed on Oct. 31, 2010.