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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 11, 2026 2:18 PM UTC
55°F
90°F
12 mph
1010-1018 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.
2 current reports along the route, including 1 full closure. Always check with the responsible state DOT before setting off.
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Road closed
I-15 closed
Mainline closure. Work: Emergency Work. Lanes closed: All. Near Helendale, San Bernardino County.
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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, the current weather is characterized by cloudy skies with a temperature of 27.8°C (82°F)
- The humidity level is at 68%, contributing to a moderate air quality risk, as an air quality alert is currently in effect until 9:00 PM on August 11, 2026
- The maximum feels-like temperature is expected to reach 37.2°C (99°F) approximately five to six hours from now, indicating a low temperature risk
- Winds are light, blowing from the southeast at about 4 km/h (3 mph)
- The atmospheric pressure is measured at 1011 mb (29.83 inHg), with visibility extending to 16 km (9.9 miles).
Tucson, AZ weather
- In Tucson, AZ, the current weather conditions are mostly clear with a temperature of 26.0°C (79°F) and a dew point of 17.0°C (63°F)
- The humidity level is at 57%, making it relatively comfortable
- Winds are coming from the southeast at 7 to 16 mph (11 to 25 km/h)
- Visibility is good, reaching up to 16 km (10 miles)
- The atmospheric pressure is measured at 1011 mb (29.83 inHg). However, there is an active flood watch in effect from 2:00 PM to 11:00 PM local time today, which indicates potential flooding risks in the area
- It is advisable to stay informed about this alert and take necessary precautions if you plan to be outdoors.
Flagstaff, AZ weather
- In Flagstaff, AZ, as of 5:00 AM on August 11, 2026, the weather is clear with a temperature of 19.2°C (66.6°F) and a relative humidity of 57%
- The wind is calm, blowing from the west-southwest at 4.5 KPH (2.8 MPH)
- Visibility is good at 16 km (9.9 miles), and the atmospheric pressure is measured at 1011 MB (29.83 inHg)
- There are no active weather alerts at this time, and conditions are stable with no precipitation reported.
California I-15 weather conditions
Los Angeles, CA weather
- The current weather in Los Angeles, CA, is clear with a temperature of 20.0°C (68°F) and a relative humidity of 89%
- The wind is calm, blowing from the south-southwest at approximately 1 km/h (1 mph)
- The atmospheric pressure is steady at 1015 mb (29.97 inHg), and visibility is good at 16 km (9.9 miles)
- There are no active weather alerts at this time.
Sacramento, CA weather
- The current weather in Sacramento, CA, indicates clear conditions with a temperature of 19.9°C (67.8°F) and a relative humidity of 49%
- The wind is blowing from the south at approximately 4.5 KPH (2.8 MPH)
- Visibility is good at 16 km (9.9 miles), and the atmospheric pressure is 1013 mb (29.9 inHg)
- There are no active weather alerts at this time.
San Francisco, CA weather
- Current weather conditions in San Francisco, CA indicate a temperature of 14.6°C (58.3°F) with a dew point of 12.9°C (55.2°F) and humidity at 89%
- Winds are coming from the west-southwest at 5 to 10 kph (3 to 6 mph)
- Visibility is good at 0.9 km (0.6 miles)
- The sky is mostly cloudy, covering approximately 75% of the sky
- The pressure is at 1013 mb (29.9 inHg)
- There is an active coastal flood advisory in effect from August 10, 2026, at 10:18 PM to August 13, 2026, at 2:00 AM
- No significant weather impacts are reported at this time, making it a relatively calm period for outdoor activities despite the advisory.
Idaho I-15 weather conditions
Boise, ID weather
- In Boise, ID, an air quality alert is currently in effect from August 10, 2026, at 10:29 AM until August 12, 2026, at 12:00 PM
- The weather conditions at 6:02 AM on August 11, 2026, indicate a temperature of 14.3°C (57.7°F) with a dew point of 8.1°C (46.6°F) and humidity at 66%
- Winds are light, coming from the southeast at 1 km/h (0.6 mph)
- Visibility is good at 16 km (9.9 miles), and the atmosphere is experiencing patchy smoke, which may contribute to the moderate air quality risk
- The pressure is measured at 1014 mb (29.9 inHg)
- Outdoor activities may be affected due to the air quality alert, and it is advisable to take precautions if engaging in such activities during this time.
Idaho Falls, ID weather
- Current weather conditions in Idaho Falls, ID indicate that the air quality is unhealthy, with an AQI of 162, primarily due to pm2.5 pollution, posing a moderate risk for outdoor activities
- The temperature is currently 17.3°C (63°F), with a dew point of 4.9°C (40°F) and humidity at 44%
- Winds are coming from the southwest at 4 km/h (3 mph), and visibility is good at 14.5 km (9.0 miles)
- The atmospheric pressure is measured at 1011 mb (29.83 inHg)
- There are no active alerts at this time.
Lewiston, ID weather
- In Lewiston, ID, an air quality alert is currently in effect from August 10, 2026, at 11:25 AM to August 11, 2026, at 11:30 AM
- The air quality alert indicates a moderate risk due to air quality issues, which may impact outdoor activities
- The temperature is 17.2°C (63°F) with a dew point of 4.6°C (40°F) and humidity at 43%
- Winds are coming from the southeast at 7 km/h (4 mph) and visibility is good at 16.1 km (10.0 miles)
- The atmospheric pressure is 1014 mb (29.9 inHg).
Montana I-15 weather conditions
Billings, MT weather
- In Billings, MT, an air quality alert is currently in effect from 7:30 AM on August 10, 2026, until 9:00 AM on August 11, 2026
- The weather conditions are characterized by a temperature of 16.7°C (62°F) with patchy smoke present in the area
- The humidity level stands at 58%, while the wind is blowing from 241° at a speed of 13.5 kph (8 mph)
- Visibility is good at 16.1 km (10 miles)
- The atmospheric pressure is measured at 1012 mb (29.88 inHg)
- Residents are advised to be mindful of the air quality and take necessary precautions, particularly if engaging in outdoor activities.
Missoula, MT weather
- In Missoula, MT, the current weather conditions indicate a temperature of 9.6°C (49°F) with a humidity level of 76%
- The air quality is currently unhealthy, with an AQI of 154, primarily due to PM2.5 pollutants
- An air quality alert is in effect from 7:30 AM on August 10, 2026, until 9:00 AM on August 11, 2026
- Winds are light, blowing from 122° at a speed of approximately 0 to 1 km/h (0 to 1 mph)
- The atmospheric pressure is measured at 1011 mb (29.83 inHg)
- Visibility is relatively good at 6.4 km (4.0 miles), although the sky is hazy
- Outdoor activities may be impacted by the current air quality conditions.
Great Falls, MT weather
- In Great Falls, MT, the current weather conditions indicate a temperature of 12.1°C (54°F) with a humidity level of 69%
- The air quality is categorized as unhealthy for sensitive groups, with an AQI of 124, primarily due to pm2.5 pollutants
- Wind is blowing from the west-southwest at 8 km/h (5 mph)
- Visibility is good at 10.9 km (6.8 miles)
- There are no active alerts at this time, but outdoor activities should be approached with caution due to the air quality concerns.
Nevada I-15 weather conditions
Las Vegas, NV weather
- In Las Vegas, NV, the current weather conditions indicate a temperature of 32.4°C (90°F) with a dew point of 12.1°C (53.8°F), resulting in a humidity level of 29%
- The weather is mostly clear at this time, with visibility extending to 16 km (9.9 miles)
- Wind is blowing from the southeast at 8 km/h (5 mph) with a pressure of 1008 mb (29.77 inHg)
- Looking ahead, in about 5 to 6 hours, the maximum feels-like temperature is expected to reach 35.7°C (96°F), which poses a low temperature risk for outdoor activities
- Additionally, the air quality is forecast to become unhealthy, with an AQI of 169 and ozone (O3) as the dominant pollutant, presenting a moderate risk
- There are currently no active alerts for this area.
Reno, NV weather
- In Reno, NV, the current weather conditions indicate a temperature of 18.3°C (64.9°F) with a hazy atmosphere
- The humidity is relatively low at 39%, and the wind is blowing from the west-northwest at 2.2 kph (1.4 mph)
- The air quality is a concern, as it's forecasted to be unhealthy for sensitive groups with an AQI of 147 expected in about 3 to 4 hours, primarily due to pm2.5 pollutants
- There are no active weather alerts at this time
- Visibility is good, reaching up to 16 km (9.9 miles)
- The atmospheric pressure is measured at 1012 mb (29.88 inHg)
- Overall, while the weather is mild, sensitive groups should take precautions regarding air quality in the coming hours.
Elko, NV weather
- Current weather conditions in Elko, NV, indicate a clear sky with a temperature of 17.6°C (63.7°F)
- The humidity level is at 42%, contributing to a comfortable atmosphere
- Winds are calm, blowing from the west-southwest at 0 km/h (0 mph)
- The atmospheric pressure is measured at 1012 mb (29.9 inHg), and visibility is good at 16.1 km (10.0 miles)
- There are no significant weather alerts in effect at this time.
Utah I-15 weather conditions
Salt Lake City, UT weather
- Current weather conditions in Salt Lake City, UT, indicate a temperature of 24.6°C (76°F) with a humidity level of 39%
- The dew point is at 9.6°C (49°F), and the pressure is recorded at 1008 mb (29.77 inHg)
- Winds are coming from the southeast at 5 to 10 km/h (3 to 6 mph) and visibility is good at 16 km (9.9 miles)
- The weather is mostly cloudy, and the UV index is low
- There are no active weather alerts at this time.
Saint George, UT weather
- The current weather in Saint George, UT, is clear with a temperature of 26.1°C (79°F)
- The humidity level is at 41%, indicating relatively dry conditions
- Winds are light, blowing from the east-southeast at about 3 to 7 mph (5 to 11 km/h)
- The atmospheric pressure is measured at 1010 mb (29.83 inHg), and visibility is good at 16.1 km (10 miles)
- There are no active weather alerts at this time, and overall, conditions are favorable for outdoor activities.
Moab, UT weather
- Current weather conditions in Moab, UT indicate a temperature of 23.9°C (75°F) with a relative humidity of 43%
- The wind is blowing from the southeast at speeds of 0 to 2 mph (0 to 1 kph)
- Visibility is good at 16 km (10 miles), and the sky is partly cloudy with 16% cloud coverage
- The atmospheric pressure is 1009 mb (29.8 inHg)
- There are no active weather alerts at this time, and no precipitation is currently occurring.
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