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 Apr 28 2026
Official Sunrise Wednesday 452 PST
Official Sunset Wednesday 1832 PST
Forecaster: J Wood
.Forecast Summary...Clouds have developed today over the higher terrain but are not expected to develop into anything significant. Cannot rule out a brief light shower for the remainder of the afternoon. Skies will clear this evening with the loss of daytime heating. High pressure will slowly build over the region for the remainder of the week. There will continue to be afternoon clouds and high temperatures will be on the increase. This weekend will be warm and dry. Southerly winds will be on the increase early next week as a Pacific system approaches the California coast.
---For The Nevada National Security Site---
.Tonight...Partly cloudy this evening becoming clear overnight. Evening southwest winds becoming northeast 5 to 15 mph overnight. Low temperatures 28 to 36 on the mesas, 35 to 40 on the dry lakes, 42 to 50 at the lower elevations, 50 at Mercury.
.Wednesday...Sunny in the morning becoming partly cloudy in the afternoon. . Northeast winds to 10 mph in the morning becoming southwest 10 to 20 mph in the afternoon. High temperatures 58 to 65 on the mesas, 72 to 79 at the lower elevations, 75 at Mercury.
.Wednesday Night...Mostly clear. Evening southwest winds becoming northeast 5 to 15 mph overnight. Low temperatures 37 to 44 on the mesas, 40 to 45 on the dry lakes, 45 to 53 at the lower elevations, 52 at Mercury.
.Thursday...Partly cloudy. Northwest winds 10 to 25 mph. High temperatures 60 to 67 on the mesas, 75 to 82 at the lower elevations, 78 at Mercury.
.Friday...Mostly sunny. North winds 10 to 25 mph. Low temperatures 40 to 47 on the mesas, 40 to 45 on the dry lakes, 51 to 58 at the lower elevations, 57 at Mercury. High temperatures 63 to 70 on the mesas, 78 to 85 at the lower elevations, 80 at Mercury.
.Saturday...Partly cloudy. Southwest winds 10 to 25 mph. Low temperatures 40 to 47 on the mesas, 45 to 50 on the dry lakes, 51 to 58 at the lower elevations, 58 at Mercury. High temperatures 63 to 70 on the mesas, 78 to 85 at the lower elevations, 81 at Mercury.
.Sunday...Partly cloudy. Southeast winds 15 to 30 mph. Low temperatures 40 to 47 on the mesas, 50 to 55 on the dry lakes, 53 to 60 at the lower elevations, 59 at Mercury. High temperatures 61 to 68 on the mesas, 77 to 84 at the lower elevations, 80 at Mercury.
.Monday...Partly cloudy. South winds 15 to 30 mph. Low temperatures 40 to 47 on the mesas, 50 to 55 on the dry lakes, 53 to 60 at the lower elevations, 58 at Mercury. High temperatures 59 to 66 on the mesas, 73 to 80 at the lower elevations, 76 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 Apr 28 2026
Official Sunrise Wednesday 452 PST
Official Sunset Wednesday 1832 PST
Forecaster: J Wood
NNSS Forecast Weather Threat Matrix
Wed 4/29
Thu 4/30
Fri 5/01
Sat 5/02
Sun 5/03
Mon 5/04
None.
None.
None.
None.
Wind.
Wind.
Threat/Impacts Legend
None/Low
Minor
Moderate
Major
.Forecast Summary...Clouds have developed today over the higher terrain but are not expected to develop into anything significant. Cannot rule out a brief light shower for the remainder of the afternoon. Skies will clear this evening with the loss of daytime heating. High pressure will slowly build over the region for the remainder of the week. There will continue to be afternoon clouds and high temperatures will be on the increase. This weekend will be warm and dry. Southerly winds will be on the increase early next week as a Pacific system approaches the California coast.
---For The Nevada National Security Site---
.Tonight...Partly cloudy this evening becoming clear overnight. Evening southwest winds becoming northeast 5 to 15 mph overnight. Low temperatures 28 to 36 on the mesas, 35 to 40 on the dry lakes, 42 to 50 at the lower elevations, 50 at Mercury.
.Wednesday...Sunny in the morning becoming partly cloudy in the afternoon. . Northeast winds to 10 mph in the morning becoming southwest 10 to 20 mph in the afternoon. High temperatures 58 to 65 on the mesas, 72 to 79 at the lower elevations, 75 at Mercury.
.Wednesday Night...Mostly clear. Evening southwest winds becoming northeast 5 to 15 mph overnight. Low temperatures 37 to 44 on the mesas, 40 to 45 on the dry lakes, 45 to 53 at the lower elevations, 52 at Mercury.
.Thursday...Partly cloudy. Northwest winds 10 to 25 mph. High temperatures 60 to 67 on the mesas, 75 to 82 at the lower elevations, 78 at Mercury.
.Friday...Mostly sunny. North winds 10 to 25 mph. Low temperatures 40 to 47 on the mesas, 40 to 45 on the dry lakes, 51 to 58 at the lower elevations, 57 at Mercury. High temperatures 63 to 70 on the mesas, 78 to 85 at the lower elevations, 80 at Mercury.
.Saturday...Partly cloudy. Southwest winds 10 to 25 mph. Low temperatures 40 to 47 on the mesas, 45 to 50 on the dry lakes, 51 to 58 at the lower elevations, 58 at Mercury. High temperatures 63 to 70 on the mesas, 78 to 85 at the lower elevations, 81 at Mercury.
.Sunday...Partly cloudy. Southeast winds 15 to 30 mph. Low temperatures 40 to 47 on the mesas, 50 to 55 on the dry lakes, 53 to 60 at the lower elevations, 59 at Mercury. High temperatures 61 to 68 on the mesas, 77 to 84 at the lower elevations, 80 at Mercury.
.Monday...Partly cloudy. South winds 15 to 30 mph. Low temperatures 40 to 47 on the mesas, 50 to 55 on the dry lakes, 53 to 60 at the lower elevations, 58 at Mercury. High temperatures 59 to 66 on the mesas, 73 to 80 at the lower elevations, 76 at Mercury.
-End Forecast---J Wood
Weather questions or reports should be directed to the Duty Forecaster at 5-1255.