Lexington Weather

Lexington, Massachusetts, USA

68°F
7/28/2026 7:36am 
  • Lexington Conditions: Mist, Overcast
  • Temperature: 68.4°F / 20.2°CWarmer 0.9°F than last hour.
  • Dew Point: 66.6°FIncreased 1.3°Fsince last hour.
  • Relative Humidity: 94%Increased 1.0% since last hour.
  • Wind: Calm, 10-min avg: Calm, gust: None
  • Barometer: 29.71 in Steady
  • Visibility: 4 miles
  • Rain Today: 0.00 in
  •   

Watches, Warnings, and Advisories

Issued by the National Weather Service - NWS Tucson Arizona

    EXTREME HEAT WARNING  

Upper Santa Cruz River and Altar Valleys including Nogales, AZ

Extreme Heat Warning issued July 28 at 1:19AM MST until August 2 at 8:00PM MST by NWS Tucson AZ

EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM THURSDAY TO 8 PM MST SUNDAY

Areas Affected: Western Pima County Including Ajo/Organ Pipe Cactus National Monument; Tohono O'odham Nation including Sells; Upper Santa Cruz River and Altar Valleys including Nogales; Tucson Metro Area including Tucson/Green Valley/Marana/Vail; South Central Pinal County including Eloy/Picacho Peak State Park; Southeast Pinal County including Kearny/Mammoth/Oracle; Upper San Pedro River Valley including Sierra Vista/Benson; Eastern Cochise County Below 5000 Feet including Douglas/Willcox; Upper Gila River and Aravaipa Valleys including Clifton/Safford

Urgency: Expected

Severity: Severe

Certainty: Likely

Alert Sent: Tuesday 1:19am MST

Alert Effective: Tuesday 1:19am MST

Alert Expires: Tuesday 5:00pm MST (expect updated alert by this time)

Event Onset: Thursday 10:00am MST

Event Ends: Sunday 8:00pm MST

Issued by: NWS Tucson AZ

Details: 
...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM THURSDAY TO 8 PM MST SUNDAY...

* WHAT...Dangerously hot conditions with temperatures 101 to 106 in
Santa Cruz and Cochise Counties and 107 to 112 elsewhere. Major to
Extreme HeatRisk is expected.

* WHERE...Eastern Cochise County below 5000 feet, South Central Pinal
County, Southeast Pinal County, Tohono O'odham Nation, Tucson Metro
Area, Upper Gila River Valley, Upper San Pedro River Valley, Upper
Santa Cruz River Valley/Altar Valley, and Western Pima County.

* WHEN...From 10 AM Thursday to 8 PM MST Sunday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

* ADDITIONAL DETAILS...Warm overnight low temperatures of 84 to 90
degrees will provide little to no relief from heat overnight.
Warmest overnight low temperatures expected in the Western Deserts.

Information: 
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.

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.

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.

Meta data: 
ID: urn:oid:2.49.0.1.840.0.029beb0041cea97b826354e597dcd24e7d602aa7.001.1
Codes: AZZ501, AZZ502, AZZ503, AZZ504, AZZ505, AZZ506, AZZ507, AZZ508, AZZ509
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.029beb0041cea97b826354e597dcd24e7d602aa7.001.1

 

    FLOOD WATCH  

Upper Santa Cruz River and Altar Valleys including Nogales, AZ

Flood Watch issued July 27 at 8:39PM MST until July 28 at 5:00AM MST by NWS Tucson AZ

FLOOD WATCH IN EFFECT UNTIL 5 AM MST TUESDAY

Areas Affected: Upper Santa Cruz River and Altar Valleys including Nogales; Upper San Pedro River Valley including Sierra Vista/Benson; Dragoon/Mule/Huachuca and Santa Rita Mountains including Bisbee/Canelo Hills/Madera Canyon; Baboquivari Mountains including Kitt Peak

Urgency: Future

Severity: Severe

Certainty: Possible

Alert Sent: Monday 8:39pm MST

Alert Effective: Monday 8:39pm MST

Alert Expires: Tuesday 5:00am MST

Event Onset: Monday 9:00pm MST

Event Ends: Tuesday 5:00am MST

Issued by: NWS Tucson AZ

Details: 
...FLOOD WATCH IN EFFECT UNTIL 5 AM MST TUESDAY...

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...A portion of Southeast Arizona, including the following
areas, Baboquivari Mountains, Dragoon and Mule and Huachuca and
Santa Rita Mountains, Upper San Pedro River Valley and Upper Santa
Cruz River Valley/Altar Valley.

* WHEN...Until 5 AM MST Tuesday.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
- An organized cluster of storms or mesoscale convective system
(MCS) in northeast Sonora Mexico is expected to slowly drift
northwest across portions of south-central Arizona late this
evening and overnight tonight. This storm system will be capable
of producing moderate rainfall with pockets of very heavy
rainfall. Although widespread rainfall amounts between 0.50 and
1.00 inches are anticipated, localized rainfall amounts between 1
and 3 inches will be possible resulting in localized flash
flooding. The heaviest rainfall is expected over the southwest
half of Santa Cruz county and extreme south-central Pima county
and may have significant impact on the Nogales Wash overnight.
Heavy rainfall Monday evening along Highway 286 and along and
Arivaca Road have made portions of south central Pima county
vulnerable to flash flooding with additional rainfall overnight.
- http://www.weather.gov/safety/flood

Information: 
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

Meta data: 
ID: urn:oid:2.49.0.1.840.0.56cb007b0b4134fbefbb3e25c1a3deb21f6a093c.001.1
Codes: AZZ503, AZZ507, AZZ513, AZZ515
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.56cb007b0b4134fbefbb3e25c1a3deb21f6a093c.001.1