Lexington Weather

Lexington, Massachusetts, USA

70°F
5/19/2026 12:17am 
  • Lexington Conditions: Clear
  • Temperature: 69.8°F / 21.0°CWarmer 0.7°F than last hour.
  • Dew Point: 62.6°FIncreased 0.4°Fsince last hour.
  • Relative Humidity: 78%Decreased 1.0% since last hour.
  • Wind: Calm, 10-min avg: Calm, gust: 1 mph
  • Barometer: 30.02 in Steady
  • Visibility: 10 miles
  • Rain Today: 0.00 in
  •   
Southeast Middlesex County, MA - Heat Advisory - Air Quality Alert
 - SEE ALL NEARBY ALERTS -

Watches, Warnings, and Advisories

Issued by the National Weather Service - Boston / Norton, MA

    AIR QUALITY ALERT  

Southeast Middlesex County, MA

Air Quality Alert issued May 18 at 11:21PM EDT by NWS Boston/Norton MA

AIR QUALITY ALERT IN EFFECT FROM 11 AM TO 11 PM EDT TUESDAY

Areas Affected: Western Essex; Eastern Essex; Western Norfolk; Southeast Middlesex; Suffolk; Eastern Norfolk; Northern Bristol; Western Plymouth; Eastern Plymouth

Urgency: Unknown

Severity: Unknown

Certainty: Unknown

Alert Sent: Monday 11:21pm EDT

Alert Effective: Monday 11:21pm EDT

Alert Expires: Tuesday 11:15pm EDT

Event Onset: Monday 11:21pm EDT

Issued by: NWS Boston/Norton MA

Details: 
...AIR QUALITY ALERT IN EFFECT FROM 11 AM TO 11 PM EDT TUESDAY...

The Massachusetts Department of Environmental Protection has issued
an Air Quality Alert for Ground Level Ozone, from 11 AM to 11 PM EDT
Tuesday.

An Air Quality Alert day means that Ground Level Ozone
concentrations within the region may approach or exceed levels that
are Unhealthy for Sensitive Groups.

Air is unhealthy for sensitive children and adults, such as those
with asthma, lung or heart disease, and older adults. Sensitive
children and adults should limit prolonged outdoor activity.

For additional information, please visit the Massachusetts
Department of Environmental Protection website at:
https://mass.gov/dep/massair/forecast

Meta data: 
ID: urn:oid:2.49.0.1.840.0.a69fe03c5f0fcf20d36b9e7475e5140c5d53a3e3.003.1
Codes: MAZ006, MAZ007, MAZ013, MAZ014, MAZ015, MAZ016, MAZ017, MAZ018, MAZ019
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a69fe03c5f0fcf20d36b9e7475e5140c5d53a3e3.003.1