Air Resources Laboratory / Special Operations And Research Division (SORD)
Weather Advisories:
Nevada National Security Site Weather Forecast
Air Resources Laboratory/Special Operations and Research Division
1330 PST Tue Sep 29 2026
Official Sunrise Wednesday 539 PST
Official Sunset Wednesday 1729 PST
Forecaster: J Wood
.Forecast Summary...Clouds continue to pass over the site this afternoon due to an area of low pressure located over northwest Arizona. The low will be heading off to the east tonight allowing skies to clear. Breezy northeast winds will also be on the decrease but could remain elevated near the northern mesas. High pressure will build over the region beginning tomorrow and remain in place through the weekend. Warm afternoon temperatures under mostly sunny skies will be observed during this time.
---For The Nevada National Security Site---
.Tonight...Partly cloudy this evening then clear overnight. Northeast winds 5 to 15 mph. Higher gusts near the northern mesas. Low temperatures 40 to 47 on the mesas, 45 to 50 on the dry lakes, 52 to 60 at the lower elevations, 58 at Mercury.
.Wednesday...Sunny. Northeast winds 10 to 20 mph. High temperatures 70 to 78 on the mesas, 84 to 91 at the lower elevations, 87 at Mercury.
.Wednesday Night...Clear. Northeast winds 5 to 15 mph. Low temperatures 50 to 57 on the mesas, 45 to 50 on the dry lakes, 57 to 65 at the lower elevations, 64 at Mercury.
.Thursday...Sunny. Northeast winds 5 to 15 mph in the morning becoming south 5 to 15 mph in the afternoon. High temperatures 67 to 74 on the mesas, 87 to 94 at the lower elevations, 90 at Mercury.
.Friday...Mostly Sunny. Southwest winds 10 to 20 mph. Low temperatures 48 to 55 on the mesas, 45 to 50 on the dry lakes, 60 to 68 at the lower elevations, 67 at Mercury. High temperatures 73 to 80 on the mesas, 87 to 94 at the lower elevations, 91 at Mercury.
.Saturday...Partly cloudy. Southwest winds 10 to 20 mph. Low temperatures 48 to 55 on the mesas, 45 to 50 on the dry lakes, 62 to 70 at the lower elevations, 69 at Mercury. High temperatures 74 to 81 on the mesas, 89 to 96 at the lower elevations, 92 at Mercury.
.Sunday...Mostly sunny. Southwest winds 10 to 25 mph. Low temperatures 48 to 55 on the mesas, 50 to 55 on the dry lakes, 62 to 69 at the lower elevations, 68 at Mercury. High temperatures 72 to 80 on the mesas, 88 to 95 at the lower elevations, 91 at Mercury.
.Monday...Partly cloudy. Southwest winds 10 to 20 mph. Low temperatures 48 to 55 on the mesas, 50 to 55 on the dry lakes, 62 to 69 at the lower elevations, 67 at Mercury. High temperatures 70 to 78 on the mesas, 86 to 93 at the lower elevations, 89 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.
Air Resources Laboratory/Special Operations and Research Division
1330 PST Tue Sep 29 2026
Official Sunrise Wednesday 539 PST
Official Sunset Wednesday 1729 PST
Forecaster: J Wood
NNSS Forecast Weather Threat Matrix
Wed 9/30
Thu 10/01
Fri 10/02
Sat 10/03
Sun 10/04
Mon 10/05
None
None
None
None
None
None
Threat/Impacts Legend
None/Low
Minor
Moderate
Major
.Forecast Summary...Clouds continue to pass over the site this afternoon due to an area of low pressure located over northwest Arizona. The low will be heading off to the east tonight allowing skies to clear. Breezy northeast winds will also be on the decrease but could remain elevated near the northern mesas. High pressure will build over the region beginning tomorrow and remain in place through the weekend. Warm afternoon temperatures under mostly sunny skies will be observed during this time.
---For The Nevada National Security Site---
.Tonight...Partly cloudy this evening then clear overnight. Northeast winds 5 to 15 mph. Higher gusts near the northern mesas. Low temperatures 40 to 47 on the mesas, 45 to 50 on the dry lakes, 52 to 60 at the lower elevations, 58 at Mercury.
.Wednesday...Sunny. Northeast winds 10 to 20 mph. High temperatures 70 to 78 on the mesas, 84 to 91 at the lower elevations, 87 at Mercury.
.Wednesday Night...Clear. Northeast winds 5 to 15 mph. Low temperatures 50 to 57 on the mesas, 45 to 50 on the dry lakes, 57 to 65 at the lower elevations, 64 at Mercury.
.Thursday...Sunny. Northeast winds 5 to 15 mph in the morning becoming south 5 to 15 mph in the afternoon. High temperatures 67 to 74 on the mesas, 87 to 94 at the lower elevations, 90 at Mercury.
.Friday...Mostly Sunny. Southwest winds 10 to 20 mph. Low temperatures 48 to 55 on the mesas, 45 to 50 on the dry lakes, 60 to 68 at the lower elevations, 67 at Mercury. High temperatures 73 to 80 on the mesas, 87 to 94 at the lower elevations, 91 at Mercury.
.Saturday...Partly cloudy. Southwest winds 10 to 20 mph. Low temperatures 48 to 55 on the mesas, 45 to 50 on the dry lakes, 62 to 70 at the lower elevations, 69 at Mercury. High temperatures 74 to 81 on the mesas, 89 to 96 at the lower elevations, 92 at Mercury.
.Sunday...Mostly sunny. Southwest winds 10 to 25 mph. Low temperatures 48 to 55 on the mesas, 50 to 55 on the dry lakes, 62 to 69 at the lower elevations, 68 at Mercury. High temperatures 72 to 80 on the mesas, 88 to 95 at the lower elevations, 91 at Mercury.
.Monday...Partly cloudy. Southwest winds 10 to 20 mph. Low temperatures 48 to 55 on the mesas, 50 to 55 on the dry lakes, 62 to 69 at the lower elevations, 67 at Mercury. High temperatures 70 to 78 on the mesas, 86 to 93 at the lower elevations, 89 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.