Lexington Weather

Lexington, Massachusetts, USA

75°F

8/26/2026 8:05pm

Lexington Conditions: Mostly cloudy
Temperature: 74.8°F / 23.8°C
Dew Point: 64.0°F
Relative Humidity: 69%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.98 in Rising Slowly
Visibility: 10 miles
Rain Today: 0.00 in

Watches, Warnings, and Advisories

Issued by the National Weather Service - Los Angeles, CA

EXTREME HEAT WARNING

Extreme Heat Warning issued August 26 at 10:54AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY

Areas Affected: Cuyama Valley; Santa Clarita Valley; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Southern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley; Los Angeles County San Gabriel Valley

Urgency: Expected

Severity: Severe

Certainty: Likely

Alert Sent: Wednesday 10:54am PDT

Alert Effective: Wednesday 10:54am PDT

Alert Expires: Friday 8:00pm PDT

Event Onset: Wednesday 10:54am PDT

Event Ends: Friday 8:00pm PDT

Issued by: NWS Los Angeles/Oxnard CA

Details:

...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...

* WHAT...Hot daytime conditions with high temperatures between 100
and 110 common. Warm overnight conditions will bring less relief
than usual.

* WHERE...Most mountains and valleys of Los Angeles, Ventura, and
Santa Barbara Counties.

* WHEN...Until 8 PM PDT Friday.

* IMPACTS...There is a high risk for dangerous heat illness,
especially for sensitive groups like the very young, the very old,
those without air conditioning, and those active outdoors.

Information:

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. Limit strenuous activities
to early morning or evening hours. Take action when you see symptoms
of heat exhaustion.

Meta data:

ID: urn:oid:2.49.0.1.840.0.7c04d47739b010bc33f7d53c614a61566da0ae6a.001.1
Codes: CAZ038, CAZ088, CAZ351, CAZ352, CAZ353, CAZ356, CAZ357, CAZ358, CAZ369, CAZ370, CAZ371, CAZ372, CAZ373, CAZ374, CAZ375, CAZ376, CAZ378, CAZ379, CAZ380, CAZ381, CAZ382, CAZ383, CAZ548
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7c04d47739b010bc33f7d53c614a61566da0ae6a.001.1

RED FLAG WARNING

Red Flag Warning issued August 26 at 2:09PM PDT until August 28 at 3:00PM PDT by NWS Los Angeles/Oxnard CA

RED FLAG WARNING REMAINS IN EFFECT UNTIL 3 PM PDT FRIDAY FOR EXTREME HEAT AND INSTABILITY ALONG WITH LOCALLY GUSTY WINDS AND LOW HUMIDITIES FOR THE INTERIOR MOUNTAINS AND ADJACENT FOOTHILLS OF LOS ANGELES, VENTURA, SANTA BARBARA, AND SAN LUIS OBISPO COUNTIES, AND CUYAMA VALLEY

Areas Affected: Cuyama Valley; San Luis Obispo County Mountains; Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor

Urgency: Expected

Severity: Severe

Certainty: Likely

Alert Sent: Wednesday 2:09pm PDT

Alert Effective: Wednesday 2:09pm PDT

Alert Expires: Thursday 10:00am PDT (expect updated alert by this time)

Event Onset: Wednesday 2:09pm PDT

Event Ends: Friday 3:00pm PDT

Issued by: NWS Los Angeles/Oxnard CA

Details:

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 3 PM PDT FRIDAY FOR EXTREME HEAT AND INSTABILITY ALONG WITH LOCALLY GUSTY WINDS AND LOW HUMIDITIES FOR THE INTERIOR MOUNTAINS AND ADJACENT FOOTHILLS OF LOS ANGELES, VENTURA, SANTA BARBARA, AND SAN LUIS OBISPO COUNTIES, AND CUYAMA VALLEY...

...RED FLAG WARNING IN EFFECT THROUGH 3 PM FRIDAY FOR MANY
INTERIOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO EXTREME HEAT AND
INSTABILITY ALONG WITH LOCALLY GUSTY WINDS AND LOW HUMIDITIES...

.A very hot and unstable air mass combined with locally gusty
winds and low humidities will bring a significant risk of large
plume dominated fires with rapid spread and extreme fire
behavior.

* TEMPERATURES...Highs 100 to 110 across the lower mountains,
adjacent foothills and the Cuyama Valley, and 85 to 95 across
higher mountains. Lows in the mid 70s to mid 80s common in the
mountains and foothills.

* INSTABILITY...Very deep mixing heights of 12,000 to 20,000
feet today through Thursday, slightly lower on Friday.

* WINDS...Local northwest to north winds 15 to 25 mph with gusts
up to 35 mph at times, strongest across the I-5 and Highway 33
corridors. A slightly stronger northerly wind push is possible
late Thursday night into Friday morning, with gusts up to 40
mph possible across the I-5 corridor.

* RELATIVE HUMIDITY...Minimum humidities 10 to 20 percent each
day, with isolated values as low as 8 percent today and
Thursday. Poor recoveries overnight hours in the mountains and
foothills with humidities in the 15 to 30 percent range.

* IMPACTS...There is a significant risk of large plume dominated
fires with rapid fire spread and extreme fire behavior. There
is a history of large plume dominated fires this time of year
with similar weather and fuel conditions, including the
Bridge, Bobcat, and Station fires.

Information:

A Red Flag Warning means that critical fire weather conditions
will occur shortly. Use extreme caution with anything that can
spark a wildfire. Residents near wildland interfaces should be
prepared to evacuate if a wildfire breaks out. See
readyforwildfire.org and wildfirerisk.org for information.

Meta data:

ID: urn:oid:2.49.0.1.840.0.ce7b66f20841e2ea76a7ba8826dd11778b7113cb.001.1
Codes: CAZ238, CAZ345, CAZ353, CAZ376, CAZ377, CAZ378, CAZ379
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ce7b66f20841e2ea76a7ba8826dd11778b7113cb.001.1