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I-15 Interstate Road Conditions
I-15 Road Conditions & Weather
Updated Aug 23, 2026 11:27 PM UTC · 6 states · Mostly dry, wet in places
Lowest 72°F near Pocatello, Idaho · Highest wind 25 mph near Barstow, California
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Interstate 15 (I‑15) runs from San Diego, California, to Sweet Grass, Montana at the Canadian border, forming a major north–south corridor through the western United States. It passes through cities such as San Diego, Las Vegas, St. George, Provo, Salt Lake City, Pocatello, Idaho Falls, Butte, Helena, and Great Falls.
- Road system: Interstate Highway System
- Year of construction: 1957
- Length: 1,433 miles
Weather data from Aug 23, 2026 11:27 PM UTC
72°F
111°F
25 mph
1001-1013 hPa
Current I-15 Conditions by State
California I-15 road conditions
Dry
- Barstow 108°F · 10 mph wind · Dry
- San Diego 94°F · 8 mph wind · Dry
Nevada I-15 road conditions
Dry
- Las Vegas 109°F · 11 mph wind · Dry
- Henderson 109°F · 11 mph wind · Dry
Utah I-15 road conditions
Dry
- Provo 96°F · 7 mph wind · Dry
- Saint George 103°F · 6 mph wind · Dry
- Salt Lake City 85°F · 4 mph wind · Dry
Idaho I-15 road conditions
Dry
- Idaho Falls 89°F · 13 mph wind · Dry
- Pocatello 72°F · 20 mph wind · Dry
Montana I-15 road conditions
Dry
- Great Falls 89°F · 23 mph wind · Dry
- Helena 90°F · 15 mph wind · Dry
See live weather forecast for I‑15. Get real‑time I‑15 road and weather conditions displayed directly on the interactive map for your route through California, Nevada, Arizona, Utah, Idaho, and Montana.
The map shows live weather conditions along Interstate 15, updated frequently to help drivers plan safer trips. Forecasts are generated for the next 6 hours at key highway points and include temperature and conditions such as clear skies, rain, storms, snow, high wind, hail, and more.
No full closures are reported on I-15 as of Aug 23, 2026 11:27 PM UTC, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.
Arizona I-15 weather conditions
Flagstaff, AZ weather
- Current weather conditions in Flagstaff, AZ indicate a clear sky with a temperature of 20.6°C (69°F) and a humidity level of 41%
- The wind is blowing from the northwest at 6 km/h (4 mph) and the atmospheric pressure is measured at 1010 mb (29.83 inHg)
- Visibility is good at 16 km (9.9 miles)
- There are no active weather alerts at this time.
California I-15 weather conditions
Los Angeles, CA weather
- In Los Angeles, CA, the current weather is clear with a temperature of 19.9°C (67.8°F) and a humidity level of 82%
- The wind is blowing from the south at 1.8 kph (1 mph), and the atmospheric pressure is 1012 mb (29.9 inHg)
- There is a heat advisory in effect from 10:00 AM on August 23, 2026, until 10:00 AM on August 25, 2026, indicating that high temperatures may pose health risks, particularly for vulnerable populations
- Following this, an extreme heat watch will take effect on August 25, 2026, at 10:00 AM and will last until August 28, 2026, at 8:00 PM, suggesting that conditions could become even more severe
- Currently, there are no significant weather impacts affecting outdoor activities.
Idaho I-15 weather conditions
Idaho Falls, ID weather
- The current weather in Idaho Falls, ID, at 6:02 AM on August 23, 2026, is clear with a temperature of 15.4°C (59.7°F) and a humidity level of 88%
- The wind is blowing from the east at a speed of 2.7 KPH (1.7 MPH)
- The atmospheric pressure is measured at 1015 MB (30.0 inHg)
- Visibility is good, reaching up to 16 KM (9.9 miles)
- There are no active weather alerts at this time, and overall conditions are calm and pleasant.
Montana I-15 weather conditions
Great Falls, MT weather
- In Great Falls, MT, the current weather conditions indicate a temperature of 18.7°C (65.7°F) with a clear sky
- The humidity level is at 63%, and the dew point is 11.5°C (52.7°F)
- Winds are blowing from the southwest at 20 km/h (12 mph)
- The pressure is measured at 1009 mb (29.8 inHg), suggesting stable atmospheric conditions
- There is a slight risk of severe thunderstorms in the area, which may impact outdoor activities, although no active alerts have been issued
- Visibility is good at 16.1 km (10.0 miles)
- As of the current time, 6:04 AM on August 23, 2026, the weather remains calm but keep an eye on potential developments throughout the day.
Nevada I-15 weather conditions
Las Vegas, NV weather
- Las Vegas, NV is currently under an extreme heat warning, which is in effect from 1:44 AM to 8:00 PM today
- The temperature is currently 31.8°C (89°F) with a maximum feels-like temperature expected to reach 36.4°C (97°F) later in the day
- Humidity levels are at 19%, indicating relatively dry conditions
- Winds are light, blowing from the west at 5 to 10 mph (8 to 16 km/h)
- The atmospheric pressure is measured at 1008 mb (29.77 inHg)
- Visibility is clear, extending up to 16 km (9.9 miles)
- As outdoor activities may be impacted by the heat, caution is advised.
Utah I-15 weather conditions
Saint George, UT weather
- Current weather conditions in Saint George, UT indicate a clear sky with a temperature of 27.1°C (80.8°F) and a humidity level of 28%
- The wind is blowing from the southeast at approximately 5 to 12 mph (9 to 19 kph)
- Visibility is good, reaching 16.1 km (10.0 miles)
- The atmospheric pressure is measured at 1009 mb (29.8 inHg)
- There are no weather alerts in effect, and the probability of precipitation is 0%.
Salt Lake City, UT weather
- In Salt Lake City, UT, the current weather conditions indicate a temperature of 22.5°C (72°F) with a humidity level of 47%
- The area is experiencing partly cloudy skies with a cloud coverage of 16%
- Winds are coming from the east-southeast at a speed of 6 km/h (4 mph)
- There is a slight risk of severe thunderstorms in the region, categorized as low risk, according to NOAA
- The visibility is good at 16 km (10 miles)
- The atmospheric pressure is measured at 1011 mb (29.83 inHg)
- As of now, there are no active alerts in effect.
I-15 Road Weather FAQ
- Is I-15 closed right now?
- No full closures are reported on I-15. No lane closures or roadworks are reported either.
- What are I-15 road conditions today?
- The map on this page colours the route along I-15 by what is on the carriageway right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Aug 23, 2026 11:27 PM UTC. Right now temperatures run from 72°F to 111°F and the strongest wind is 25 mph.
- How often are I-15 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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