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 4 2026
Official Sunrise Wednesday 453 PST
Official Sunset Wednesday 1847 PST
Forecaster: J Wood
.Forecast Summary...Southern Nevada can expect consistently hot temperatures later in the week as high pressure builds over the area. Its positioning allows for an influx of moisture resulting in cloud coverage and the slight chance of showers and isolated thunderstorms over the weekend. Confidence remains low but any developments are likely to favor higher terrain features. Smoke and haze continue to impact the site, settling in the low valleys overnight.
---For The Nevada National Security Site---
.Tonight...Clear. Southwesterly winds 10 to 20 mph in the evening becoming light and variable overnight. Low temperatures 56 to 64 on the mesas, 59 to 65 on the dry lakes, 75 to 83 at the lower elevations, 78 at Mercury.
.Wednesday...Sunny and hot. Southwesterly winds 10 to 20 mph gusting to 30 mph. High temperatures 85 to 93 on the mesas, 101 to 109 at the lower elevations, 103 at Mercury.
.Wednesday Night...Clear. Southwesterly winds 10 to 20 mph in the evening becoming light and variable overnight. Low temperatures 54 to 62 on the mesas, 55 to 61 on the dry lakes, 72 to 80 at the lower elevations, 77 at Mercury.
.Thursday...Mostly Sunny and hot. Southwesterly winds 10 to 20 mph. Low temperatures 55 to 63 on the mesas, 58 to 64 on the dry lakes, 73 to 81 at the lower elevations, 79 at Mercury. High temperatures 86 to 94 on the mesas, 101 to 109 at the lower elevations, 104 at Mercury.
.Friday...Partly Cloudy. Southwesterly winds 10 to 20 mph. Low temperatures 58 to 66 on the mesas, 63 to 69 on the dry lakes, 77 to 85 at the lower elevations, 82 at Mercury. High temperatures 86 to 94 on the mesas, 102 to 110 at the lower elevations, 105 at Mercury.
.Saturday...Partly Cloudy with a slight chance of thunderstorms. Southwesterly winds 10 to 20 mph. Low temperatures 58 to 66 on the mesas, 63 to 69 on the dry lakes, 77 to 85 at the lower elevations, 82 at Mercury. High temperatures 86 to 94 on the mesas, 102 to 110 at the lower elevations, 105 at Mercury.
.Sunday...Partly Cloudy with a slight chance of thunderstorms. Southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 59 to 67 on the mesas, 63 to 69 on the dry lakes, 77 to 85 at the lower elevations, 82 at Mercury. High temperatures 84 to 92 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Monday...Mostly Cloudy with a slight chance of thunderstorms. Southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 58 to 66 on the mesas, 60 to 66 on the dry lakes, 75 to 83 at the lower elevations, 81 at Mercury. High temperatures 81 to 89 on the mesas, 96 to 104 at the lower elevations, 99 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 4 2026
Official Sunrise Wednesday 453 PST
Official Sunset Wednesday 1847 PST
Forecaster: J Wood
NNSS Forecast Weather Threat Matrix
Wed 8/05
Thu 8/06
Fri 8/07
Sat 8/08
Sun 8/09
Mon 8/10
Heat.
Heat.
Heat.
Heat/Thunderstorms.
Heat/Thunderstorms.
Thunderstorms.
Threat/Impacts Legend
None/Low
Minor
Moderate
Major
.Forecast Summary...Southern Nevada can expect consistently hot temperatures later in the week as high pressure builds over the area. Its positioning allows for an influx of moisture resulting in cloud coverage and the slight chance of showers and isolated thunderstorms over the weekend. Confidence remains low but any developments are likely to favor higher terrain features. Smoke and haze continue to impact the site, settling in the low valleys overnight.
---For The Nevada National Security Site---
.Tonight...Clear. Southwesterly winds 10 to 20 mph in the evening becoming light and variable overnight. Low temperatures 56 to 64 on the mesas, 59 to 65 on the dry lakes, 75 to 83 at the lower elevations, 78 at Mercury.
.Wednesday...Sunny and hot. Southwesterly winds 10 to 20 mph gusting to 30 mph. High temperatures 85 to 93 on the mesas, 101 to 109 at the lower elevations, 103 at Mercury.
.Wednesday Night...Clear. Southwesterly winds 10 to 20 mph in the evening becoming light and variable overnight. Low temperatures 54 to 62 on the mesas, 55 to 61 on the dry lakes, 72 to 80 at the lower elevations, 77 at Mercury.
.Thursday...Mostly Sunny and hot. Southwesterly winds 10 to 20 mph. Low temperatures 55 to 63 on the mesas, 58 to 64 on the dry lakes, 73 to 81 at the lower elevations, 79 at Mercury. High temperatures 86 to 94 on the mesas, 101 to 109 at the lower elevations, 104 at Mercury.
.Friday...Partly Cloudy. Southwesterly winds 10 to 20 mph. Low temperatures 58 to 66 on the mesas, 63 to 69 on the dry lakes, 77 to 85 at the lower elevations, 82 at Mercury. High temperatures 86 to 94 on the mesas, 102 to 110 at the lower elevations, 105 at Mercury.
.Saturday...Partly Cloudy with a slight chance of thunderstorms. Southwesterly winds 10 to 20 mph. Low temperatures 58 to 66 on the mesas, 63 to 69 on the dry lakes, 77 to 85 at the lower elevations, 82 at Mercury. High temperatures 86 to 94 on the mesas, 102 to 110 at the lower elevations, 105 at Mercury.
.Sunday...Partly Cloudy with a slight chance of thunderstorms. Southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 59 to 67 on the mesas, 63 to 69 on the dry lakes, 77 to 85 at the lower elevations, 82 at Mercury. High temperatures 84 to 92 on the mesas, 100 to 108 at the lower elevations, 103 at Mercury.
.Monday...Mostly Cloudy with a slight chance of thunderstorms. Southwesterly winds 10 to 20 mph gusting to 30 mph. Low temperatures 58 to 66 on the mesas, 60 to 66 on the dry lakes, 75 to 83 at the lower elevations, 81 at Mercury. High temperatures 81 to 89 on the mesas, 96 to 104 at the lower elevations, 99 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.