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I-45 Interstate Road Conditions
I-45 Road Conditions & Weather
Radar and live pavement conditions along I-45 in Texas — plus closures, road work and city-by-city weather along the route.
Updated Sep 15, 2026 3:48 AM UTC · Mostly dry
Lowest 82°F near Houston, Texas · Highest wind 11 mph near Houston, Texas
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Interstate 45 (I-45) runs from Galveston, Texas, to Dallas, Texas, providing an intrastate north–south route entirely within the state. It passes through cities such as Galveston, Houston, Conroe, Huntsville, and Dallas.
- Road system: Interstate Highway System
- Year of construction: 1957
- Length: 285 miles
Weather data from Sep 15, 2026 3:48 AM UTC
82°F
92°F
11 mph
29.87-30.03 inHg
Current I-45 Conditions by State
Measured end to end, I-45 runs 284 miles south to north from Galveston, Texas to Dallas, Texas, entirely inside Texas.
| State | Miles | Cities and mile markers |
|---|---|---|
| Texas | 284 | Houston 46 · Dallas 284 |
Mile markers count from each state's southern line and start again at the next one, which is how most states number their exits as well. They are measured along the same road geometry these pages draw, so they land within a mile or two of the posted markers. A toll road that runs its own continuous numbering is the exception — on the New York Thruway the posts continue from New York City — and there the figure is how far into the state the place is rather than the number on the sign. Distances are measured state by state, never across a gap.
No full closures are reported on I-45 as of Sep 15, 2026 3:48 AM UTC, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.
Texas I-45 weather conditions
Summaries fetched Sep 14, 2026 12:07 PM UTC
Houston, TX weather
- In Houston, TX, a heat advisory is currently in effect from 11:00 AM to 6:00 PM today
- The maximum feels-like temperature is expected to reach 104.7°F later in the day, posing a temperature risk for outdoor activities
- At this time, the temperature is 82.2°F with a dew point of 79°F and humidity at a high 90%
- Winds are light, blowing from the southeast at 2 to 4 mph
- The atmospheric pressure is measured at 30.06 inHg, and visibility is good at 9.9 miles
- The weather is sunny, making it essential to stay hydrated and take precautions if spending time outdoors during the heat advisory period.
Dallas, TX weather
- In Dallas, TX, a heat advisory is currently in effect from 5:58 AM to 8:00 PM today
- The weather is clear with a temperature of 79.9°F and a relative humidity of 81%
- The maximum feels-like temperature is expected to reach 104°F later in the day, posing a temperature risk for outdoor activities
- Wind speeds are light, blowing from the southeast at approximately 4 mph
- The atmospheric pressure is measured at 30.06 inHg, and visibility is good at 9.9 miles.
I-45 Road Weather FAQ
- Is I-45 closed right now?
- No full closures are reported on I-45. No lane closures or roadworks are reported either.
- What are I-45 road conditions today?
- The map on this page colors the route along I-45 by what is on the pavement right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Sep 15, 2026 3:48 AM UTC. Right now temperatures run from 82°F to 92°F and the strongest wind is 11 mph.
- How long is Interstate 45, and which states does it cross?
- Measured end to end, I-45 runs 284 miles south to north, from Galveston, Texas to Dallas, Texas, entirely inside Texas. Mile markers restart at each state line, so Houston is around mile 46 in Texas.
- How often are I-45 road conditions updated?
- The road surface and weather layers are rebuilt whenever this page is opened with data more than ten minutes old, and refreshed on a schedule in between, so nothing here is more than about two hours old even on a road nobody has looked at. Closures and road blocks are re-imported from the state 511 feeds every fifteen minutes, and the written state-by-state summaries are refreshed daily. Every section on this page carries the time its data was fetched.
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