League City residents planning Labor Day weekend outdoors should expect afternoon storm chances each day and heat index values topping 100 degrees.

Lingering tropical moisture left behind by the remnants of Tropical Storm Edouard will keep the atmosphere unsettled over Southeast Texas through the holiday weekend, according to CW39 Houston. Edouard made landfall Tuesday, Sept. 1, near Johnson Bayou, Louisiana, as a 60 mph tropical storm and was no longer a tropical cyclone by Thursday, Sept. 3. League City avoided the worst of its rain, but saturated soils across the region mean even small storms could trigger localized street flooding, CW39 reported.

The Houston Chronicle reported Friday, Sept. 4, that localized street flooding remains possible through the weekend, especially in flood-prone areas with poor drainage.

Here is the forecast for the League City area through Labor Day:

  • Friday, Sept. 4: Showers likely, high near 91, heat index up to 103, 60% chance of rain
  • Saturday, Sept. 5: Showers likely after 1 p.m., high near 90, 60% chance of rain
  • Sunday, Sept. 6: 50% chance of showers and thunderstorms
  • Monday, Sept. 7 (Labor Day): Mostly sunny, high around 92, slight chance of afternoon storms

Saturday looks like the wettest day. A tropical wave moving through the northern Gulf is forecast to bring the best chance of widespread thunderstorms, KPRC 2 meteorologist Rachel Briers reported Friday, Sept. 4, along with a low street-flooding threat.

"Don't cancel those outdoor plans but have a backup to move them indoors," Briers wrote in her Sept. 3 forecast.

Heat will be the other concern. The Chronicle reported heat index values are forecast to peak above 100 degrees through the weekend. The National Weather Service League City forecast showed a heat index as high as 103 on Friday alone.

No watches or warnings were posted for the League City area as of Friday, Sept. 4, according to the NWS Houston/Galveston office.

Residents can monitor conditions at weather.gov or by signing up for Galveston County emergency alerts at galvestoncountyoem.com.