Houston started Monday, April 20, 2026, on a cool and calm note, but the break in the action will be short-lived. Mostly cloudy skies and a 40% chance of hit-or-miss light showers are expected through the day, with afternoon highs near 70°F. By Tuesday and Wednesday, a slower, wetter storm pattern moves in, setting the stage for locally heavy rain and some minor street flooding.
Monday: Spotty Showers, Jacket Weather
After about 7 a.m. Monday, April 20, 2026, scattered rain showers may develop, riding in on an east breeze near 10 mph. Highs stay close to 70°F, keeping things on the cool side for late April. The first round of showers will favor areas along and west of Interstate 45, then gradually expand east through the afternoon, so morning commuters from Katy and west Houston are most likely to see a few light showers. Rainfall totals through Monday night should be modest, generally around one-tenth to one-quarter of an inch in spots that pick up measurable rain.
Tuesday–Wednesday: Slow Storms, Heavy Pockets Of Rain
Rain chances ramp up Tuesday, April 21, 2026, into Wednesday, April 22, 2026, as showers and thunderstorms become more widespread and highs climb into the upper 70s. The Weather Prediction Center has placed much of Southeast Texas under a Marginal Risk (level 1 of 4) for excessive rainfall during this period. Forecasters expect around 1 to 2 inches of rain over a broad area, with locally higher amounts where storms linger. Because these storms will be slow movers, brief but intense downpours could lead to ponding on roads and slower commutes at times on both Tuesday and Wednesday.
Coastal And Marine Concerns
Boaters and anglers will want to stay weather-aware. Small Craft Advisories remain posted through Monday night for portions of the Gulf waters, and seas offshore are expected to build again by midweek as southeasterly winds strengthen. According to the National Weather Service Houston/Galveston, water levels during high tides should run close to 3.0 feet above mean lower low water through midweek. That is high enough to trigger minor coastal flooding in the usual vulnerable low-lying spots, so unnecessary offshore trips are best put on hold while conditions stay choppy.
How To Plan Around The Rain
Plan on carrying rain gear Monday, and treat the early week showers as a warm-up act for more widespread rain Tuesday and Wednesday. If you have flexibility, try to shift outdoor plans away from Tuesday evening and into later in the week when conditions should gradually improve. Never drive through standing water; even a quick burst from a slow-moving storm can flood underpasses and low spots faster than you might expect. Before heading out, check the latest local forecast and stay alert for any advisories or statements that may be issued as the wetter pattern settles in.
