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 Aug 18 2026
Official Sunrise Wednesday 505 PST
Official Sunset Wednesday 1830 PST
Forecaster: J Wood
.Forecast Summary...High pressure ridging continues over the western half of the US bringing consistently hot temperatures to the site. Some high clouds from the Pacific will enter the region but offer little relief from the sun. Monsoon moisture will return later in the week as early as overnight Thursday, aiding isolated thunderstorm development on Friday. The mesas and higher terrain features along the site's eastern boundary are the most favorable areas for virga and showers throughout the weekend.
---For The Nevada National Security Site---
.Tonight...Mostly Clear. Southwesterly winds 10 to 20 mph becoming light and variable overnight. Low temperatures 55 to 63 on the mesas, 58 to 64 on the dry lakes, 75 to 83 at the lower elevations, 80 at Mercury.
.Wednesday...Mostly Sunny. Southwesterly winds 10 to 20 mph gusting to 30 mph. High temperatures 82 to 90 on the mesas, 100 to 108 at the lower elevations, 101 at Mercury.
.Wednesday Night...Mostly Clear. Southwesterly winds 10 to 20 mph becoming light and variable overnight. Low temperatures 54 to 62 on the mesas, 56 to 62 on the dry lakes, 72 to 80 at the lower elevations, 78 at Mercury.
.Thursday...Mostly Sunny. Southwesterly winds 10 to 20 mph gusting to 30 mph. High temperatures 82 to 90 on the mesas, 100 to 108 at the lower elevations, 101 at Mercury.
.Friday...Partly Cloudy with a slight chance for thunderstorms. South southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 54 to 62 on the mesas, 59 to 65 on the dry lakes, 74 to 82 at the lower elevations, 80 at Mercury. High temperatures 80 to 88 on the mesas, 99 to 107 at the lower elevations, 99 at Mercury.
.Saturday...Partly Cloudy with a slight chance for thunderstorms. Southerly winds 10 to 20 mph gusting to 30 mph. Low temperatures 54 to 62 on the mesas, 57 to 63 on the dry lakes, 74 to 82 at the lower elevations, 78 at Mercury. High temperatures 79 to 87 on the mesas, 98 to 106 at the lower elevations, 98 at Mercury.
.Sunday...Partly Cloudy with a slight chance for thunderstorms. Southerly winds 10 to 20 mph gusting to 30 mph. Low temperatures 53 to 61 on the mesas, 57 to 63 on the dry lakes, 73 to 81 at the lower elevations, 78 at Mercury. High temperatures 77 to 85 on the mesas, 97 to 105 at the lower elevations, 96 at Mercury.
.Monday...Partly Cloudy. South southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 50 to 58 on the mesas, 54 to 60 on the dry lakes, 70 to 78 at the lower elevations, 76 at Mercury. High temperatures 76 to 84 on the mesas, 95 to 103 at the lower elevations, 95 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 Aug 18 2026
Official Sunrise Wednesday 505 PST
Official Sunset Wednesday 1830 PST
Forecaster: J Wood
NNSS Forecast Weather Threat Matrix
Wed 8/19
Thu 8/20
Fri 8/21
Sat 8/22
Sun 8/23
Mon 8/24
None.
None.
Thunderstorms.
Thunderstorms.
Thunderstorms.
None.
Threat/Impacts Legend
None/Low
Minor
Moderate
Major
.Forecast Summary...High pressure ridging continues over the western half of the US bringing consistently hot temperatures to the site. Some high clouds from the Pacific will enter the region but offer little relief from the sun. Monsoon moisture will return later in the week as early as overnight Thursday, aiding isolated thunderstorm development on Friday. The mesas and higher terrain features along the site's eastern boundary are the most favorable areas for virga and showers throughout the weekend.
---For The Nevada National Security Site---
.Tonight...Mostly Clear. Southwesterly winds 10 to 20 mph becoming light and variable overnight. Low temperatures 55 to 63 on the mesas, 58 to 64 on the dry lakes, 75 to 83 at the lower elevations, 80 at Mercury.
.Wednesday...Mostly Sunny. Southwesterly winds 10 to 20 mph gusting to 30 mph. High temperatures 82 to 90 on the mesas, 100 to 108 at the lower elevations, 101 at Mercury.
.Wednesday Night...Mostly Clear. Southwesterly winds 10 to 20 mph becoming light and variable overnight. Low temperatures 54 to 62 on the mesas, 56 to 62 on the dry lakes, 72 to 80 at the lower elevations, 78 at Mercury.
.Thursday...Mostly Sunny. Southwesterly winds 10 to 20 mph gusting to 30 mph. High temperatures 82 to 90 on the mesas, 100 to 108 at the lower elevations, 101 at Mercury.
.Friday...Partly Cloudy with a slight chance for thunderstorms. South southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 54 to 62 on the mesas, 59 to 65 on the dry lakes, 74 to 82 at the lower elevations, 80 at Mercury. High temperatures 80 to 88 on the mesas, 99 to 107 at the lower elevations, 99 at Mercury.
.Saturday...Partly Cloudy with a slight chance for thunderstorms. Southerly winds 10 to 20 mph gusting to 30 mph. Low temperatures 54 to 62 on the mesas, 57 to 63 on the dry lakes, 74 to 82 at the lower elevations, 78 at Mercury. High temperatures 79 to 87 on the mesas, 98 to 106 at the lower elevations, 98 at Mercury.
.Sunday...Partly Cloudy with a slight chance for thunderstorms. Southerly winds 10 to 20 mph gusting to 30 mph. Low temperatures 53 to 61 on the mesas, 57 to 63 on the dry lakes, 73 to 81 at the lower elevations, 78 at Mercury. High temperatures 77 to 85 on the mesas, 97 to 105 at the lower elevations, 96 at Mercury.
.Monday...Partly Cloudy. South southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 50 to 58 on the mesas, 54 to 60 on the dry lakes, 70 to 78 at the lower elevations, 76 at Mercury. High temperatures 76 to 84 on the mesas, 95 to 103 at the lower elevations, 95 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.