Climate & Weather in Katy
Katy shares the greater Houston area's humid subtropical climate: hot, humid summers, mild winters with essentially no sustained freezing, and rainfall spread across the year rather than concentrated in one short season. That warmth is part of the relocation draw, paired with the same hurricane-season awareness (for rain and wind, not landfall) as the rest of the Houston metro.
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Learn moreWarm summers, mild winters
One climate-data aggregator puts Katy's warmest month, August, at an average daytime high around 95°F (35°C) with overnight lows around 75°F (24°C), and its coolest month, January, at an average daytime high around 63°F (17°C) with overnight lows around 41°F (5°C) -- a mean annual temperature around 69.7°F. Sustained hard freezes are rare, though not impossible, in a typical winter.
Rainfall spread across the year, not concentrated in one narrow window
Annual precipitation is cited at roughly 48 inches, with May specifically cited as the wettest month by one source (about 5.3 inches over 8 rainy days) -- a somewhat different seasonal pattern than the more June-through-September-dominated wet season common further south and east in Florida's Gulf Coast climate, reflecting Houston-area rainfall's mix of spring frontal systems and summer/fall tropical activity.
Hurricane season means rain and remnant-storm risk here, not direct landfall wind
Atlantic hurricane season runs June through November. Katy sits roughly 30 miles inland from the coast, so it is not exposed to direct hurricane wind or storm surge the way a coastal Texas city is -- but as Hurricane Harvey demonstrated in 2017, it is very much exposed to the extreme rainfall a tropical system can dump well inland. See insurance-hazard-costs for the fuller flood-risk picture.
Humidity is a year-round factor, not just a summer one
Consistent with the rest of the Houston metro, humidity stays elevated across most of the year in Katy, not just during the hottest summer months -- a real adjustment for anyone relocating from a drier climate, and a driver of real air-conditioning costs (see cost-of-living).
Key takeaways
- August (the warmest month) averages around 95°F daytime highs; January (the coolest) averages around 63°F -- mild winters with essentially no sustained hard freeze in a typical year.
- Annual rainfall runs roughly 48 inches, with May cited as the single wettest month by one source -- a spring-plus-tropical-season pattern rather than one narrow wet-season window.
- Katy sits roughly 30 miles inland, so it faces essentially no direct hurricane wind/storm-surge exposure, but as Hurricane Harvey (2017) showed, it faces real inland flood risk from tropical rainfall -- see insurance-hazard-costs.
- Humidity stays elevated for much of the year, not just in summer -- a real adjustment for relocators from drier climates.
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