It's been two weeks since we've had measurable rain at St. Louis Lambert Airport, but that's about to change. While it won't be a rainout the next four days, at the very least we have a rain chance in the forecast tonight through the weekend. This has been an unusual dry spell in what has been a very wet year so far. In fact, at one point in July the Weather Service deemed this the wettest start to the year on record for St. Louis.
As of today (Wednesday) we're more than 14 inches above normal for precipitation on the year. Last year we were about 4 inches below normal. But this month of August so far has recorded only 0.67 inches of rain, that's over an inch below the August norm.
But let's look ahead, after all that's my job...to forecast. We have good rain chances (40% or better) in the forecast tonight through Sunday. While it's difficult to pin down a timing on these multiple surges of rain, it appears we have a good bet for rain on Thursday morning, Friday afternoon and Saturday afternoon. Sunday could be off and on rain any part of the day, and then by Monday a few showers may still linger but mainly South of St. Louis.
Below is a rainfall forecast for the next 5 days. St. Louis is around 1.25" to 1.50" with the heavier rainfall totals colored in purple to the South at about 1.50" to 2.00". Keep in mind that's over a five day period, so it's not exceptionally heavy rain. However, also keep in mind that we've only had 0.67" this month of August so far. The bottom line is that you'll want to keep the umbrella handy for off and on showers and even a few thunderstorms through this weekend.