Forecast for Interstate 15: Mon, Sep 13

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Extended Forecast Current Conditions | Hourly Forecast | Extended Forecast City Weather High Low Precip Details Sweet Grass, Montana 59484     Mostly Cloudy 68°F 0°F Mostly cloudy. Highs 65 to 70. Great Falls, Montana 59401     Mostly Cloudy 68°F 0°F Mostly cloudy. Highs 65 to 70. Helena, Montana 59601     Chance of Showers 60°F 40°F 20% Mostly cloudy with a 20 percent chance of rain showers. Highs 55 to 65. Lows 35 to 45. Butte, Montana 59701     Chance of Showers 60°F 0°F 20% Mostly cloudy with a 20 percent chance of rain showers. Highs in the upper 50s to mid 60s. Dillon, Montana 59725     Chance of T-Storm 60°F 0°F 30% Mostly cloudy with scattered thunderstorms and a slight chance of rain showers. Highs 55 to 65. Chance of precipitation 30 percent. Idaho Falls, Idaho 83401     Mostly Clear 69°F 42°F Mostly clear. Lows 38 to 45. Highs 65 to 73. Salt Lake City, Utah 84101     Partly Cloudy 80°F 51°F Partly cloudy. Lows in the lower 50s. Highs around 80. = Cedar City, Utah 84720     Partly Cloudy 80°F 45°F Sunny in the morning then becoming partly cloudy. Highs around 80. Overnight: Partly cloudy. Lows in the mid 40s. Highs around 80. = Las Vegas, Nevada 89101     Clear 89°F 64°F Clear. Highs around 89 on the west side of the valley... Around 99 on the east side. Lows 61 to 66. Barstow, California 92311     Clear 86°F 56°F Clear. Lows 52 to 60. Highs 78 to 94. Ontario, California 91758     Partly Cloudy 86°F 0°F Partly cloudy in the morning... Becoming sunny. Highs 82 to 89. San Diego, California 92101     Patchy Fog 74°F 0°F Cloudy in the morning... Becoming mostly sunny. Patchy fog in the morning. Highs 68 to 73 near the coast to 71 to 76 inland.