34°0'N / 117°41'W / Altitude 222 m / 05:44 2026/03/19, America/Los_Angeles (UTC-7)
From: 2026/03/19, 00:03
To: 2026/03/19, 15:00
* WHAT...Dangerously hot temperatures climbing to near-30 degrees above seasonal normals.
* WHERE...Portions of northwest Arizona, southeast California, and southern Nevada.
* WHEN...Until 8 PM PDT /8 PM MST/ Sunday.
* IMPACTS...Heat-related illnesses increase significantly during extreme heat events.
* ADDITIONAL DETAILS...Extreme early-season heat coupled with high tourism rates will make this heat very dangerous, particularly for those not acclimated to the heat and/or traveling from cooler climates. Numerous daily and monthly heat records are in jeopardy through at least Sunday.
San Bernardino
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and
loose-fitting clothing. Try to limit strenuous activities to early
morning or evening. Take action when you see symptoms of heat
exhaustion and heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air-conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Monitor the latest forecasts and warnings for updates.
NWS Las Vegas NV
2026/03/19, 00:03From: 2026/03/19, 00:06
To: 2026/03/19, 15:00
* WHAT...Dangerously hot conditions. Afternoon temperatures 96 to 109. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.
* WHERE...Portions of southwest Arizona and southeast and southern California.
* WHEN...Until 8 PM MST /8 PM PDT/ Sunday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat events.
San BernardinoAn Extreme Heat Warning means that a period of very hot
temperatures, even by local standards, will occur. Actions should be
taken to lessen the impact of the extreme heat.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible
and drink plenty of water.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Recognize the signs and symptoms of heat-related illness. Early
signs include thirst and muscle cramps. Heat exhaustion may include:
cool, moist, pale skin; headache; dizziness; weakness or exhaustion;
nausea. The most serious illness is heat stroke, which may include:
vomiting; confusion; throbbing headache; decreased alertness or loss
of consciousness; high body temperature (above 105F); hot, dry skin;
rapid, weak pulse; rapid, shallow breathing; seizures.NWS Phoenix AZ2026/03/19, 00:06
From: 2026/03/19, 01:51
To: 2026/03/19, 16:00
* WHAT...High temperatures in the 80s to mid 90s below 6500 feet expected.
* WHERE...San Bernardino County Mountains.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
San BernardinoDrink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.NWS San Diego CA2026/03/19, 01:51From: 2026/03/19, 01:51
To: 2026/03/19, 16:00
* WHAT...High temperatures in the upper 90s to 104 degrees expected.
* WHERE...San Bernardino and Riverside County Valleys-The Inland Empire.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* ADDITIONAL DETAILS...Overnight low temperatures in foothill locations will only fall into the lower to mid 70s limiting relief from the heat.
San Bernardino,San Bernardino and Riverside County Valleys-The Inland EmpireDrink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.NWS San Diego CA2026/03/19, 01:51