Next 7 departures
- SatOct 3
ClearNo significant weather expected. Temperatures 71–89°F along the way.
Along the way
Checkpoint · arrival Weather · temperature San Diego7 AM PDT Sunny78°F Temecula8 AM PDT Sunny71°F Riverside8:30 AM PDT Sunny75°F Cajon Summit9 AM PDT Sunny75°F Barstow9:45 AM PDT Sunny76°F Baker10:45 AM PDT Sunny87°F Mountain Pass11:15 AM PDT Sunny76°F Las Vegas12:15 PM PDT Sunny89°F - SunOct 4
CautionNear 90°F near Las Vegas around 12:15 PM PDT.
Along the way
Checkpoint · arrival Weather · temperature San Diego7 AM PDT Mostly sunny78°F Temecula8 AM PDT Mostly sunny72°F Riverside8:30 AM PDT Sunny75°F Cajon Summit9 AM PDT Sunny74°F Barstow9:45 AM PDT Sunny77°F Baker10:45 AM PDT Sunny87°F Mountain Pass11:15 AM PDT Sunny77°F Las Vegas12:15 PM PDT Sunny90°F - MonOct 5
ClearNo significant weather expected. Temperatures 73–89°F along the way.
Along the way
Checkpoint · arrival Weather · temperature San Diego7 AM PDT Mostly sunny78°F Temecula8 AM PDT Sunny73°F Riverside8:30 AM PDT Sunny76°F Cajon Summit9 AM PDT Sunny74°F Barstow9:45 AM PDT Sunny76°F Baker10:45 AM PDT Sunny87°F Mountain Pass11:15 AM PDT Sunny75°F Las Vegas12:15 PM PDT Sunny89°F - TueOct 6
CautionNear 91°F near Las Vegas around 12:15 PM PDT.
Along the way
Checkpoint · arrival Weather · temperature San Diego7 AM PDT Mostly sunny77°F Temecula8 AM PDT Sunny73°F Riverside8:30 AM PDT Sunny76°F Cajon Summit9 AM PDT Sunny74°F Barstow9:45 AM PDT Sunny76°F Baker10:45 AM PDT Sunny87°F Mountain Pass11:15 AM PDT Sunny77°F Las Vegas12:15 PM PDT Sunny91°F - WedOct 7
CautionNear 94°F near Las Vegas around 12:15 PM PDT.
Along the way
Checkpoint · arrival Weather · temperature San Diego7 AM PDT Mostly sunny76°F Temecula8 AM PDT Sunny72°F Riverside8:30 AM PDT Sunny75°F Cajon Summit9 AM PDT Sunny75°F Barstow9:45 AM PDT Sunny77°F Baker10:45 AM PDT Sunny88°F Mountain Pass11:15 AM PDT Sunny78°F Las Vegas12:15 PM PDT Sunny94°F - ThuOct 8
CautionNear 94°F near Las Vegas around 12:15 PM PDT.
Along the way
Checkpoint · arrival Weather · temperature San Diego7 AM PDT Mostly sunny74°F Temecula8 AM PDT Sunny72°F Riverside8:30 AM PDT Sunny76°F Cajon Summit9 AM PDT Sunny76°F Barstow9:45 AM PDT Sunny77°F Baker10:45 AM PDT Sunny88°F Mountain Pass11:15 AM PDT Sunny79°F Las Vegas12:15 PM PDT Sunny94°F - FriOct 9
CautionNear 93°F near Las Vegas around 12:15 PM PDT.
Along the way
Checkpoint · arrival Weather · temperature San Diego7 AM PDT Partly sunny74°F Temecula8 AM PDT Sunny72°F Riverside8:30 AM PDT Sunny75°F Cajon Summit9 AM PDT Sunny75°F Barstow9:45 AM PDT Sunny76°F Baker10:45 AM PDT Sunny88°F Mountain Pass11:15 AM PDT Sunny78°F Las Vegas12:15 PM PDT Sunny93°F
The worst conditions expected at any checkpoint, timed to when you would reach it driving without stops. Levels use Road Travel’s driving-risk scale.
The route, stop by stop
Checkpoints in order, with driving time from San Diego (no stops) and elevation. The forecast above is timed to these.
- San Diego, CAStart 41 ftelevation
- Temecula, CAMile 59 · 56 min 1,032 ftelevation
- Riverside, CAMile 97 · 1 h 34 min 851 ftelevation
- Cajon Summit, CAMountain pass · Mile 129 · 2 h 4 min 4,190 ftelevation
- Barstow, CAMile 175 · 2 h 45 min 2,380 ftelevation
- Baker, CAMile 238 · 3 h 42 min 932 ftelevation
- Mountain Pass, CAMile 272 · 4 h 13 min 4,729 ftelevation
- Las Vegas, NVMile 330 · 5 h 8 min 2,028 ftelevation
Typical weather by month
Average daily highs and lows, and days with an inch or more of snow, at San Diego, Barstow and Las Vegas.
| Month | San Diego 15 ft | Barstow 2,220 ft | Las Vegas Las Vegas Airport station · 2,131 ft | ||
|---|---|---|---|---|---|
| High / low °F | High / low °F | Snow days | High / low °F | Snow days | |
| Jan | 66° / 50° | 59° / 35° | 0 | 59° / 41° | 0 |
| Feb | 66° / 52° | 63° / 39° | 0 | 63° / 44° | 0 |
| Mar | 67° / 55° | 70° / 44° | 0 | 71° / 51° | 0 |
| Apr | 69° / 57° | 77° / 49° | 0 | 79° / 57° | 0 |
| May | 70° / 60° | 86° / 57° | 0 | 89° / 66° | 0 |
| Jun | 72° / 63° | 96° / 65° | 0 | 99° / 76° | 0 |
| Jul | 75° / 66° | 102° / 72° | 0 | 105° / 82° | 0 |
| Aug | 77° / 68° | 101° / 70° | 0 | 103° / 81° | 0 |
| Sep | 77° / 66° | 93° / 63° | 0 | 95° / 72° | 0 |
| Oct | 75° / 62° | 81° / 53° | 0 | 81° / 60° | 0 |
| Nov | 71° / 55° | 68° / 42° | 0 | 67° / 47° | 0 |
| Dec | 66° / 50° | 57° / 35° | 0.1 | 57° / 40° | 0.1 |
NOAA NCEI U.S. Climate Normals, 1991–2020: SAN DIEGO LINDBERGH FLD (USW00023188, 15 ft); BARSTOW (USC00040521, 2,220 ft); LAS VEGAS MCCARRAN AP (USW00023169, 2,131 ft). Snow days are days with at least 1 inch of new snow. “—” means the station does not publish that normal.
Road conditions
Closures and chain rules change by the hour, so we link to the official reports for California and Nevada rather than repeat them.
- For this passCaltrans I-15 highway conditions
- California · CaltransQuickMap conditions and cameras
- California · winter rulesChain controls
- Nevada · NDOTNVroads conditions and cameras
Check the official National Weather Service forecast and each state's road report before you leave.
Get alerts timed to where you’ll be when you get there
Road Travel plans the drive from San Diego to Las Vegas with the forecast at every stretch for the hour you’ll reach it, then warns you about weather ahead while you drive.
Questions about this drive
How long is the drive from San Diego to Las Vegas?
330 miles, about 5 hours of driving without stops, by way of I-15. Fuel, food and rest stops add to that.
What is the highest point on the drive?
Mountain Pass, at 4,729 ft. It comes at mile 272, about 4 h 13 min of driving after you leave San Diego.
How cold is Las Vegas in January?
The nearest long-term NOAA station, Las Vegas Airport (2,131 ft), averages a high of 59°F and a low of 41°F in January (1991–2020 normals).