The Lake Houston area’s water levels and forecast for the morning of Wednesday, September 9, 2026. No National Weather Service flood alerts were active for Harris, Montgomery or Liberty counties at publication.
Lake levels
| Lake | Level | Percent full | Reading |
|---|---|---|---|
| Lake Houston | 42.60 feet | Full | 5:30 a.m. Central, September 9 |
| Lake Conroe | 199.97 feet | 95.2 percent | Daily value, September 9 |
The USGS gauge at Lake Houston near Sheldon, site 08072000, read 42.60 feet at 5:30 a.m. Central. Readings over the previous 48 hours ranged from 42.56 to 42.64 feet, a flat stretch with no meaningful rise or fall. The Texas Water Development Board lists Lake Houston at its conservation pool, or 100 percent full.
Lake Conroe stood at 199.97 feet and 95.2 percent of its conservation capacity, down a hundredth of a foot from Tuesday. Lake Conroe matters downstream: the San Jacinto River Authority releases from Conroe flow down the West Fork of the San Jacinto into Lake Houston, so the level upstream is part of the flooding picture in Kingwood, Humble and Atascocita.
Weather
Wednesday. A chance of showers and thunderstorms, mostly cloudy, with a high near 92 falling to around 87 in the afternoon. Heat index values as high as 102. East wind 0 to 5 mph. Chance of precipitation 40 percent.
Wednesday night. A chance of showers and thunderstorms before 10 p.m., then mostly cloudy, with a low around 76. Southeast wind 0 to 5 mph. Chance of precipitation 30 percent, with new rainfall between a tenth and a quarter of an inch possible.
Thursday. A chance of showers and thunderstorms after 7 a.m., partly sunny, with a high near 93 falling to around 88 in the afternoon. Heat index values as high as 102. Chance of precipitation 40 percent.
Alerts
No National Weather Service flood alerts, watches or warnings were active for Harris, Montgomery or Liberty counties at publication. Seven alerts were active elsewhere in Texas, none of them covering the Lake Houston area.
Sources: USGS Water Data, the Texas Water Development Board and the National Weather Service Houston/Galveston office. Gauge readings are provisional and subject to revision.
