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
1400 PST Mon Oct 20 2025
Official Sunrise Tuesday 558 PST
Official Sunset Tuesday 1659 PST
Forecaster: J Wood
.Forecast Summary...It's a seasonably warm afternoon under mostly sunny skies. Similar conditions will be observed tomorrow with high pressure remaining over the region. An area of low pressure located off the southern California coast will pass over our area on Wednesday. It will have enough moisture to produce isolated showers and thunderstorms but, precipitation amounts will be light. High temperatures will also come down a few degrees. High pressure will reestablish itself for Thursday and Friday. A Pacific storm will pass by mainly to the north providing considerable cloudiness and an increase in winds this weekend.
---For The Nevada National Security Site---
.Tonight...Mostly clear. Northeast winds 5 to 15 mph. Low temperatures 45 to 53 on the mesas, 30 to 35 on the dry lakes, 47 to 55 at the lower elevations, 54 at Mercury.
.Tuesday...Mostly sunny. Northeast winds 5 to 15 mph in the morning becoming southeast 5 to 15 mph in the afternoon. High temperatures 60 to 67 on the mesas, 74 to 81 at the lower elevations, 77 at Mercury.
.Tuesday Night...Increasing clouds. Variable winds 5 to 15 mph. Low temperatures 47 to 54 on the mesas, 40 to 45 on the dry lakes, 51 to 58 at the lower elevations, 57 at Mercury.
.Wednesday...Partly cloudy with isolated showers and thunderstorms. Northeast winds to 10 mph in the morning becoming southwest 10 to 20 mph in the afternoon. Higher gusts near thunderstorms. High temperatures 57 to 64 on the mesas, 71 to 78 at the lower elevations, 74 at Mercury.
.Thursday...Mostly sunny. Northeast winds 10 to 20 mph. Low temperatures 38 to 45 on the mesas, 35 to 40 on the dry lakes, 48 to 55 at the lower elevations, 54 at Mercury. High temperatures 58 to 65 on the mesas, 72 to 79 at the lower elevations, 75 at Mercury.
.Friday...Partly cloudy. Southeast winds 5 to 15 mph. Low temperatures 43 to 50 on the mesas, 35 to 40 on the dry lakes, 50 to 57 at the lower elevations, 56 at Mercury. High temperatures 60 to 67 on the mesas, 74 to 81 at the lower elevations, 77 at Mercury.
.Saturday...Mostly cloudy and windy. Southwest winds 20 to 35 mph. Low temperatures 40 to 48 on the mesas, 45 to 50 on the dry lakes, 51 to 58 at the lower elevations, 57 at Mercury. High temperatures 58 to 65 on the mesas, 72 to 79 at the lower elevations, 75 at Mercury.
.Sunday...Partly cloudy. Northwest winds 10 to 25 mph. Low temperatures 33 to 40 on the mesas, 45 to 50 on the dry lakes, 45 to 53 at the lower elevations, 52 at Mercury. High temperatures 50 to 58 on the mesas, 65 to 73 at the lower elevations, 69 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
1400 PST Mon Oct 20 2025
Official Sunrise Tuesday 558 PST
Official Sunset Tuesday 1659 PST
Forecaster: J Wood
NNSS Forecast Weather Threat Matrix
Tue 10/21
Wed 10/22
Thu 10/23
Fri 10/24
Sat 10/25
Sun 10/26
None.
Thunderstorms.
None.
None.
Wind.
None.
Threat/Impacts Legend
None/Low
Minor
Moderate
Major
.Forecast Summary...It's a seasonably warm afternoon under mostly sunny skies. Similar conditions will be observed tomorrow with high pressure remaining over the region. An area of low pressure located off the southern California coast will pass over our area on Wednesday. It will have enough moisture to produce isolated showers and thunderstorms but, precipitation amounts will be light. High temperatures will also come down a few degrees. High pressure will reestablish itself for Thursday and Friday. A Pacific storm will pass by mainly to the north providing considerable cloudiness and an increase in winds this weekend.
---For The Nevada National Security Site---
.Tonight...Mostly clear. Northeast winds 5 to 15 mph. Low temperatures 45 to 53 on the mesas, 30 to 35 on the dry lakes, 47 to 55 at the lower elevations, 54 at Mercury.
.Tuesday...Mostly sunny. Northeast winds 5 to 15 mph in the morning becoming southeast 5 to 15 mph in the afternoon. High temperatures 60 to 67 on the mesas, 74 to 81 at the lower elevations, 77 at Mercury.
.Tuesday Night...Increasing clouds. Variable winds 5 to 15 mph. Low temperatures 47 to 54 on the mesas, 40 to 45 on the dry lakes, 51 to 58 at the lower elevations, 57 at Mercury.
.Wednesday...Partly cloudy with isolated showers and thunderstorms. Northeast winds to 10 mph in the morning becoming southwest 10 to 20 mph in the afternoon. Higher gusts near thunderstorms. High temperatures 57 to 64 on the mesas, 71 to 78 at the lower elevations, 74 at Mercury.
.Thursday...Mostly sunny. Northeast winds 10 to 20 mph. Low temperatures 38 to 45 on the mesas, 35 to 40 on the dry lakes, 48 to 55 at the lower elevations, 54 at Mercury. High temperatures 58 to 65 on the mesas, 72 to 79 at the lower elevations, 75 at Mercury.
.Friday...Partly cloudy. Southeast winds 5 to 15 mph. Low temperatures 43 to 50 on the mesas, 35 to 40 on the dry lakes, 50 to 57 at the lower elevations, 56 at Mercury. High temperatures 60 to 67 on the mesas, 74 to 81 at the lower elevations, 77 at Mercury.
.Saturday...Mostly cloudy and windy. Southwest winds 20 to 35 mph. Low temperatures 40 to 48 on the mesas, 45 to 50 on the dry lakes, 51 to 58 at the lower elevations, 57 at Mercury. High temperatures 58 to 65 on the mesas, 72 to 79 at the lower elevations, 75 at Mercury.
.Sunday...Partly cloudy. Northwest winds 10 to 25 mph. Low temperatures 33 to 40 on the mesas, 45 to 50 on the dry lakes, 45 to 53 at the lower elevations, 52 at Mercury. High temperatures 50 to 58 on the mesas, 65 to 73 at the lower elevations, 69 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.