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I-15 Interstate Road Conditions
Weather for road I-15
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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 14, 2026 2:40 AM UTC
55°F
99°F
22 mph
1003-1015 hPa
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.
1 current report along the route. Always check with the responsible state DOT before setting off.
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Lanes blocked
Head to head traffic on the roadway on I-15 Both Directions from MM (79.6) to MM (82.2). 1 Right lane closed. 7/16/2026…
Head to head traffic on the roadway on I-15 Both Directions from MM (79.6) to MM (82.2). 1 Right lane closed. 7/16/2026 7:00 PM to 8/16/2026 6:00 AM Mon, Tue, Wed, Thu, Fri, Sat, Sun: Active all day Width Restriction: 12ft Speed Restriction: 55mph Activities: Mandatory Speed Limit in Force, Use Caution.
Arizona I-15 weather conditions
Phoenix, AZ weather
- In Phoenix, AZ, current weather conditions indicate a temperature of 27.8°C (82°F) with a feels-like temperature of 29.2°C (84°F)
- The humidity is at 60%, and the wind is calm, coming from 100° at 2.7 kph (1.7 mph)
- Visibility is clear at 16 km (9.9 miles)
- An extreme heat watch is currently in effect, which is significant as temperatures are expected to rise
- This alert is valid from 10:00 AM on August 17, 2026, until 8:00 PM on August 19, 2026
- There are no immediate weather impacts or risks for outdoor activities at this time.
Tucson, AZ weather
- Current weather conditions in Tucson, AZ indicate a temperature of 24.5°C (76°F) with a humidity level of 72%
- The wind is blowing from the southeast at 3.6 kph (2 mph)
- Visibility is good at 16 km (9.9 miles)
- The sky is mostly cloudy, covering approximately 60%
- An extreme heat watch is in effect from 10:00 AM on August 17, 2026, until 8:00 PM on August 19, 2026
- No significant weather impacts are currently affecting outdoor activities.
Flagstaff, AZ weather
- Current weather conditions in Flagstaff, AZ indicate a clear sky with a temperature of 15.7°C (60°F)
- The humidity level is at 84%, and the dew point is 13.0°C (55°F)
- Winds are coming from the northwest at 5 to 10 km/h (3 to 6 mph)
- Visibility is good at 16 km (9.9 miles)
- The atmospheric pressure is measured at 1012 mb (29.88 inHg)
- There are no active weather alerts at this time.
California I-15 weather conditions
Los Angeles, CA weather
- Current weather conditions in Los Angeles, CA, indicate a temperature of 19.7°C (67°F) with a humidity level of 73%
- The wind is blowing from the south-southeast at 2 km/h (1 mph)
- The atmospheric pressure is measured at 1015 mb (29.97 inHg)
- Visibility is good, reaching 16 km (9.9 miles)
- The sky is mostly cloudy, with cloud coverage around 100%
- As of now, there are no significant weather alerts in effect.
Sacramento, CA weather
- Current weather conditions in Sacramento, CA, indicate a temperature of 14.4°C (58°F) with a humidity level of 81%
- The wind is coming from the south at 4.5 KPH (2.8 mph), and visibility is good at 16 KM (9.9 miles)
- The atmospheric pressure is measured at 1014 MB (29.9 inHg)
- The sky is cloudy, covering approximately 100% of the area
- As of now, there are no active weather alerts.
San Francisco, CA weather
- In San Francisco, CA, the weather is currently characterized by light rain with a temperature of 15.7°C (60°F) and a high humidity level of 91%
- The wind is blowing from the southwest at 5.6 KPH (3 mph), with a visibility of approximately 15.2 km (9.4 miles)
- The atmospheric pressure is measured at 1014 mb (29.9 inHg)
- As of now, there are no active weather alerts in the area
- The conditions indicate a damp environment, so it's advisable to carry an umbrella if you are heading outside.
Idaho I-15 weather conditions
Boise, ID weather
- Current weather conditions in Boise, ID indicate a temperature of 18.8°C (65.8°F) with a humidity level of 76%
- The wind is blowing from the southeast at 6 KPH (4 mph)
- Visibility is reported at 16 km (9.9 miles)
- The atmosphere is currently affected by smoke, which may reduce air quality
- There are no significant weather alerts in effect at this time.
Idaho Falls, ID weather
- In Idaho Falls, ID, the current weather is mostly cloudy with a temperature of 12.9°C (55°F) and a dew point of 11.1°C (52°F)
- The humidity level is high at 89%, indicating a damp atmosphere
- Winds are light, coming from the southeast at 3 km/h (2 mph)
- Visibility is good at approximately 9.2 km (5.7 miles)
- There is a flash flood watch in effect from 12:00 PM to 10:00 PM local time today, which indicates the potential for hazardous conditions related to heavy rainfall
- Currently, there are no significant weather impacts affecting outdoor activities, but it's advisable to stay informed about the flash flood watch as the day progresses.
Lewiston, ID weather
- In Lewiston, ID, an air quality alert is currently in effect, which will remain active until 12:00 PM on August 14, 2026
- The weather conditions are clear, with a temperature of 20.7°C (69°F) and a dew point of 10.1°C (50°F), resulting in a relative humidity of 51%
- Winds are light, blowing from the east at 6 km/h (4 mph)
- The atmospheric pressure is measured at 1011 mb (29.83 inHg)
- Visibility is good, reaching up to 16.1 km (10.0 miles)
- Outdoor activities should be approached with caution due to the moderate air quality risk.
Montana I-15 weather conditions
Billings, MT weather
- In Billings, MT, the current weather conditions indicate a temperature of 14.9°C (58.8°F) with a high humidity level of 97%
- The air pressure is measured at 1014 mb (29.9 inHg)
- Winds are coming from the northwest at 3.7 kph (2 mph)
- Visibility is reported at approximately 12.8 km (8 miles)
- There is a chance of showers, with a slight precipitation amount of 0.01 mm (0.0004 in) and a precipitation rate of 0.52 mm/hour (0.02 in/hour)
- The dew point stands at 14.4°C (57.9°F)
- Overall, the weather is characterized by high moisture content, contributing to the likelihood of showers in the area.
Missoula, MT weather
- In Missoula, MT, the current weather conditions indicate a temperature of 16.2°C (61°F) with patchy fog present
- The humidity level is at 82%, contributing to a relatively moist atmosphere
- Winds are light, blowing from the north at 0 to 1 km/h (0 to 1 mph)
- Although there are no active weather alerts at this time, it is important to note that the air quality is forecasted to be unhealthy for sensitive groups, with an AQI of 129 expected in about 5 to 6 hours, primarily due to pm2.5 pollutants
- Visibility is reported at 16 km (9.9 miles), providing decent conditions for outdoor activities, but individuals with sensitivities should take precautions regarding air quality later in the day.
Great Falls, MT weather
- Current weather conditions in Great Falls, MT, indicate a temperature of 14.3°C (57.7°F) with a humidity level at 100%
- The wind is blowing from the north at 4 km/h (2 mph), and light rain is currently falling, with a precipitation rate of 0.01 mm/h (0.0004 in/h)
- Visibility is moderate at 8.6 km (5.3 miles)
- The atmospheric pressure is measured at 1015 mb (30.0 inHg)
- Given the high humidity, the air feels like 14.3°C (57.7°F).
Nevada I-15 weather conditions
Las Vegas, NV weather
- The current weather in Las Vegas, NV, shows clear skies with a temperature of 28.8°C (83.8°F) and a humidity level of 44%
- The wind is blowing from the southeast at 6.3 KPH (3.9 MPH), providing a gentle breeze
- The atmospheric pressure is measured at 1009 MB (29.8 inHg), indicating stable conditions
- Visibility is good at 16 KM (9.9 miles)
- There are no significant weather alerts or precipitation expected at this time.
Reno, NV weather
- Current weather conditions in Reno, NV indicate a temperature of 13.2°C (56°F) with a dew point of 9.7°C (49°F) and humidity at 79%
- Winds are light, blowing from the northwest at 0.9 KPH (0.6 mph)
- The atmospheric pressure is 1013 MB (29.9 inHg) and visibility is good at 16 KM (9.9 miles)
- The weather is mostly clear at this time
- There are no active weather alerts or significant weather impacts to report.
Elko, NV weather
- Current weather conditions in Elko, NV indicate a temperature of 13.7°C (56.7°F) with a humidity level of 73%
- The dewpoint is at 8.9°C (48.0°F), and the pressure is 1013 mb (29.9 inHg)
- Winds are blowing from the south-southwest at 2 km/h (1 mph) with a visibility of approximately 16.1 km (10.0 miles)
- The sky is currently cloudy, covering about 100% of the area
- There are no active weather alerts at this time.
Utah I-15 weather conditions
Salt Lake City, UT weather
- Currently, in Salt Lake City, UT, the weather is partly cloudy with a temperature of 15.8°C (60°F)
- The humidity level is at 78%, contributing to a comfortable atmosphere
- Winds are coming from the east-southeast at 9.7 kph (6 mph), providing a gentle breeze
- The visibility is good, extending to 16 km (9.9 miles)
- Atmospheric pressure is measured at 1014 mb (29.9 inHg)
- The conditions are stable with no active weather alerts in effect at this time.
Saint George, UT weather
- Current weather conditions in Saint George, UT indicate clear skies with a temperature of 21.4°C (70.5°F) and a dew point of 17.3°C (63.1°F)
- The humidity is at 78%, which can create a somewhat muggy feeling despite the clear weather
- Winds are light, blowing from the east-southeast at 4 km/h (2 mph)
- A flood watch is currently in effect from August 14, 2026, at 12:40 AM until August 15, 2026, at 12:00 AM
- There are no significant weather impacts reported for outdoor activities at this time
- Visibility is good at 16.1 km (10.0 miles).
Moab, UT weather
- Current weather conditions in Moab, UT indicate a temperature of 19°C (66°F) with a relative humidity of 66%
- The dew point is at 12.6°C (54.7°F), and the atmospheric pressure is 1011 mb (29.83 inHg)
- Winds are light, coming from the south-southeast at 3 kph (2 mph)
- The sky is partly cloudy with 16% cloud coverage, and visibility is good at 16 km (9.9 miles)
- There are no active weather alerts at this time.
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