The Artemis II launch window on April 1 opens at 6:24 p.m. ET.
The probability of violating weather constraints for the SLS Artemis II 48-hour delay case was 25%.
Weather for the SLS Artemis II 48-hour delay case included isolated showers, visibility greater than 7 miles, a temperature of 74°F, humidity of 80%, and ground winds of 17 to 22 knots from 120 degrees at 132 feet.
Launch-day cloud conditions for SLS Artemis II included scattered cumulus clouds with bases at 3,000 feet and tops at 13,000 feet, and scattered cirrus clouds with bases at 20,000 feet and tops at 24,000 feet.
Delay-case cloud conditions for SLS Artemis II included scattered cumulus clouds with bases at 3,000 feet and tops at 15,000 feet, and scattered cirrostratus clouds with bases at 20,000 feet and tops at 24,000 feet.
The probability of violating weather constraints for the SLS Artemis II launch day was 20%.
The 45th Weather Squadron predicted an 80% chance of favorable weather conditions for the SLS Artemis II launch on April 1, 2026.
The Launch Mission Execution Forecast for SLS Artemis II was valid for April 1, 2026.
The primary weather concerns for the SLS Artemis II 48-hour delay case were the cumulus cloud rule, thick cloud layers rule, and ground winds.
The Launch Mission Execution Forecast for SLS Artemis II was issued on March 29, 2026.
Launch-day weather for SLS Artemis II included visibility greater than 7 miles, a temperature of 75°F, humidity of 75%, and ground winds of 15 to 20 knots from 110 degrees at 132 feet.
Solar activity was low for the SLS Artemis II 48-hour delay forecast.
Artemis II will be the first mission to carry humans to lunar orbit in more than 50 years.
United Launch Alliance will set a new launch date for the Amazon Leo mission after range approvals are finalized and deconfliction with NASA's Artemis II launch is completed.
Artemis II is the first time NASA has entrusted a non-U.S. company with a critical system for a crewed mission.
The Artemis II Moonbound crew’s zero gravity indicator is named "Rise."
Airspace closure plans exist for the Artemis II launch.
Artemis II will be the first crewed mission to travel to the Moon since Apollo 17 in 1972.
Artemis II adds humans to the Artemis mission series.
Artemis II will validate a cyber-secure, AI-enabled, edge-capable architecture designed for sustained presence beyond Earth.