Lexington Weather

Lexington, Massachusetts, USA

75°F

8/26/2026 8:17pm

Lexington Conditions: Mostly cloudy
Temperature: 74.7°F / 23.7°C
Dew Point: 64.2°F
Relative Humidity: 70%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.99 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

AIR QUALITY ALERT

Air Quality Alert issued August 25 at 7:55AM PDT by NWS Los Angeles/Oxnard CA

AIR QUALITY ALERT FOR HARMFUL LEVELS OF OZONE (SMOG) AIR POLLUTION

Areas Affected: Eastern San Fernando Valley; Eastern San Gabriel Mountains; Interstate 5 Corridor; Los Angeles County Inland Coast including Downtown Los Angeles; Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western San Gabriel Mountains and Highway 14 Corridor

Urgency: Unknown

Severity: Unknown

Certainty: Unknown

Alert Sent: Tuesday 7:55am PDT

Alert Effective: Tuesday 7:55am PDT

Alert Expires: Friday 8:00pm PDT

Event Onset: Tuesday 7:55am PDT

Issued by: NWS Los Angeles/Oxnard CA

Details:

...AIR QUALITY ALERT FOR HARMFUL LEVELS OF OZONE (SMOG) AIR POLLUTION...

* WHAT...The South Coast AQMD has issued an air quality alert due to
harmful levels of ozone pollution.
Visit https://www.aqmd.gov/alertinfo to check current and forecasted
air quality levels.

* WHERE...in the the South Coast Air Basin and Coachella Valley.
Levels of ozone pollution can vary by time and location depending on
emissions and air pollution transport.

* WHEN...from 1 PM Monday to 8 PM Friday. The highest ozone levels
typically occur in the afternoon and early-evening hours.

* IMPACTS... Ozone air pollution can cause serious health problems,
including trouble breathing, asthma attacks, and lung damage.
Everyone can be affected, but sensitive groups such as people with
lung disease, older adults, people who are pregnant, children, and
those who spend a lot of time outdoors are at greater risk.

Information:

To protect your health, check air quality levels and act as needed:

* When Air Quality Index (AQI) levels are "Unhealthy for
Sensitive Groups" (orange), sensitive groups as specified
above should limit extended or intense outdoor activity.
* When AQI is "Unhealthy" (red), everyone may experience health
impacts. Sensitive groups should avoid extended time outdoors.
* When AQI is "Very Unhealthy" (purple), sensitive groups should
avoid all outdoor physical activity. Everyone else should
avoid extended or intense outdoor activity.
* When AQI is "Hazardous" (maroon), everyone should avoid all
outdoor physical activity.

* ADDITIONAL DETAILS...

To help keep indoor air clean when air quality is poor:

* Keep windows and doors closed
* Run your air conditioner and/or an air purifier
* Do not use whole house fans or swamp coolers that bring in
outside air if you have other methods to stay cool
* Avoid other sources of pollution such as fireplaces, candles,
incense, and grilling

To help minimize outdoor ozone air pollution levels:

* Limit the use of gasoline powered lawn and garden equipment
until evening hours
* Try to delay trips to the gas station and the use of household
chemicals until the evening

Meta data:

ID: urn:oid:2.49.0.1.840.0.ad0bda8006f5d3c76114dc1406eba3d653cb00c1.001.1
Codes: CAZ373, CAZ380, CAZ378, CAZ368, CAZ548, CAZ088, CAZ375, CAZ372, CAZ379
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ad0bda8006f5d3c76114dc1406eba3d653cb00c1.001.1

AIR QUALITY ALERT

Air Quality Alert issued August 25 at 6:39AM PDT by NWS Los Angeles/Oxnard CA

AIR QUALITY ALERT FOR HARMFUL LEVELS OF OZONE (SMOG) AIR POLLUTION

Urgency: Unknown

Severity: Unknown

Certainty: Unknown

Alert Sent: Tuesday 6:39am PDT

Alert Effective: Tuesday 6:39am PDT

Alert Expires: Friday 8:00pm PDT

Event Onset: Tuesday 6:39am PDT

Issued by: NWS Los Angeles/Oxnard CA

Details:

...AIR QUALITY ALERT FOR HARMFUL LEVELS OF OZONE (SMOG) AIR POLLUTION...

* WHAT...The South Coast AQMD has issued an air quality alert due to
harmful levels of ozone pollution.
Visit https://www.aqmd.gov/alertinfo to check current and forecasted
air quality levels.

* WHERE...in the the South Coast Air Basin and Coachella Valley.
Levels of ozone pollution can vary by time and location depending on
emissions and air pollution transport.

* WHEN...from 1 PM Monday to 8 PM Friday. The highest ozone levels
typically occur in the afternoon and early-evening hours.

* IMPACTS... Ozone air pollution can cause serious health problems,
including trouble breathing, asthma attacks, and lung damage.
Everyone can be affected, but sensitive groups such as people with
lung disease, older adults, people who are pregnant, children, and
those who spend a lot of time outdoors are at greater risk.

Information:

To protect your health, check air quality levels and act as needed:

* When Air Quality Index (AQI) levels are "Unhealthy for
Sensitive Groups" (orange), sensitive groups as specified
above should limit extended or intense outdoor activity.
* When AQI is "Unhealthy" (red), everyone may experience health
impacts. Sensitive groups should avoid extended time outdoors.
* When AQI is "Very Unhealthy" (purple), sensitive groups should
avoid all outdoor physical activity. Everyone else should
avoid extended or intense outdoor activity.
* When AQI is "Hazardous" (maroon), everyone should avoid all
outdoor physical activity.

* ADDITIONAL DETAILS...

To help keep indoor air clean when air quality is poor:

* Keep windows and doors closed
* Run your air conditioner and/or an air purifier
* Do not use whole house fans or swamp coolers that bring in
outside air if you have other methods to stay cool
* Avoid other sources of pollution such as fireplaces, candles,
incense, and grilling

To help minimize outdoor ozone air pollution levels:

* Limit the use of gasoline powered lawn and garden equipment
until evening hours
* Try to delay trips to the gas station and the use of household
chemicals until the evening

Meta data:

ID: urn:oid:2.49.0.1.840.0.42ee567330daed69e555ae775fc6cb5b0f8fd036.001.1
Codes: CAZ373, CAZ380, CAZ378, CAZ368, CAZ548, CAZ088, CAZ375, CAZ372, CAZ379
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.42ee567330daed69e555ae775fc6cb5b0f8fd036.001.1