Live updates: Will Artemis II launch tomorrow? Florida's weather outlook and mission status updates

To ensure the 322-foot-tall SLS rocket can safely clear the tower and navigate the lower atmosphere, NASA and the U.S. Space Force use a sophisticated network of sensors that monitor the air from the ground up to the tip of the lightning mast.

Weather instruments positioned on three towers surrounding Launch Complex 39B provide real-time data on temperature and wind.

Precision monitoring at the pad

At Launch Complex 39B, weather teams rely on three massive permanent lightning towers that surround the rocket. Each of these towers is equipped with launch-critical sensors positioned at four specific heights: 132 feet, 257 feet, 382 feet, and 457 feet.

These instruments—propeller vane anemometers—measure wind speed and direction at one-second intervals, providing a near-real-time map of how the air is moving around the vehicle.

Why the different heights matter

Monitoring multiple altitudes is essential because of a phenomenon known as wind shear. Winds at the surface might be a calm 10 mph, but 400 feet up, they could be gusting twice as fast.

Because the SLS is so large, these varying wind speeds can put immense structural stress on the rocket or push it off its precise flight path during the first few seconds of liftoff.

NASA’s strict safety thresholds for these towers include:

• Peak winds: Must generally stay below a range of 33 to 45 mph depending on the specific altitude.
• Upper-level winds: Beyond the 457-foot towers, NASA uses a Doppler Radar Wind Profiler and weather balloons to track winds up to 60,000 feet, ensuring the rocket doesn't hit high-altitude turbulence that could lead to control problems.

Weather teams are focused on the invisible forces surrounding Launch Pad 39B: the winds. As shown in the image below, sensors across three different towers are constantly measuring wind speeds at various altitudes to ensure conditions stay within NASA's strict safety window.

Current wind speeds from the monitoring equipment surrounding Launch Complex 39B at Kennedy Space Center in Florida.

Current surface winds are a light 13 mph, and even at the highest sensor level of 457 feet, speeds are holding steady between 14 and 21 mph.

These numbers are well below the critical safety threshold of 33-45 mph that would trigger a launch delay.

Because the SLS rocket is so tall and sensitive to wind shear—the change in wind speed or direction at different heights—meteorologists will continue to monitor these towers around the clock to ensure the rocket has a smooth path through the atmosphere tomorrow evening.

NASA/Kim Shiflett

While the SLS rocket stands ready on the pad, the four Artemis II astronauts are spending their final hours on Earth in a strictly controlled environment.

Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialists Christina Koch and Jeremy Hansen are currently in the final stages of NASA’s Health Stabilization Program, a standard two-week quarantine designed to ensure the crew doesn't carry even a common cold into the cramped quarters of the Orion spacecraft.

Since arriving at the Kennedy Space Center last Friday, the crew has been living in the historic Neil Armstrong Operations and Checkout Building, where contact is limited to essential flight surgeons and cleared personnel.

This soft isolation began in Houston before moving to the Florida coast, allowing the astronauts to finalize mission rehearsals and share virtual briefings with the media while ensuring that a last-minute illness doesn't jeopardize humanity's first crewed trip to the Moon in over half a century.

Artemis II is a 10-day mission that marks humanity's first return to the lunar vicinity in over 50 years.

Unlike the uncrewed Artemis I, this flight will carry four astronauts—Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialists Christina Koch and Jeremy Hansen—on a journey that will take them further from Earth than any human in history.

The Artemis II test flight will take Artemis II Comander, Reid Wiseman, Pilot Victor Glover, and Mission Specialist Christina Koch from NASA, and Mission Specialist Jeremy Hansen from the CSA (Canadian Space Agency), around the Moon and back to Earth from Launch Complex 39B at NASA Kennedy. (left to right, Jeremy Hansen, Christina Koch, Victor Glover, Reid Wiseman). (NASA/Jim Ross)

The mission follows a free-return trajectory, a figure-eight flight path where the spacecraft will orbit Earth twice to test life-support systems before swinging around the far side of the Moon.

At its closest approach, the crew will fly approximately 4,600 miles (about 7,400 km) above the lunar surface, providing a basketball-sized view of the Moon before Earth’s gravity naturally pulls the Orion capsule back home for a high-speed splashdown in the Pacific Ocean.

The 45th Weather Squadron is currently tracking a persistent onshore flow that could bring scattered showers to the Space Coast just as the Artemis II launch window opens.

Computer forecast models show the threat for showers popping up near Kennedy Space Center in Florida on Wednesday.

This pattern is fueled by a weakening front to the south, which is expected to trigger intermittent rain pushing in from the Atlantic throughout Wednesday afternoon.

While much of the more organized storm activity is predicted to drift toward the western side of the Florida peninsula by the evening, any lingering showers or thick cloud layers within five nautical miles of the flight path would result in an immediate "No-Go" for the SLS rocket.

Retired NASA engineer and Rocket Boys author Homer Hickam joins FOX Weather just one day before the Artemis II launch. In terms of weather, he’s pretty confident that it will leave the launch pad.

As the final countdown for Artemis II ticks away, the U.S. Space Force's 45th Weather Squadron has released a detailed outlook that keeps the mission at a promising 80% "Go" for Wednesday’s 6:24 p.m. ET liftoff.

While the probability remains high, meteorologists are closely watching a pattern of low-level moisture fueled by a steady, breezy onshore flow.

Latest launch weather forecast from the Space Force 45th Weather Squadron.

This setup is expected to trigger intermittent showers moving in from the Atlantic throughout the day, with additional rain potentially bubbling up over land as the daily sea breeze pushes inland during the afternoon.

The primary hurdle for the launch team will be the timing of these coastal showers and the "thick cloud" rules they bring with them.

Forecasters expect the most organized rain and thunderstorm activity to retreat toward the western side of the Florida peninsula by evening, which could leave a clear "keyhole" for the SLS rocket to climb through.

However, because the onshore winds will continue to replenish moisture right at the coast, the mission remains "No-Go" if any of these lingering showers or their associated cloud layers move within 5 nautical miles of the flight path during the two-hour launch window.

Former NASA Chief Astronaut Robert Gibson joins FOX Weather ahead of the launch of the Artemis II space mission, which will be the first time the moon has been orbited since Apollo 17, 53 years ago.

Thousands of spectators from around the world are already flooding Florida's Space Coast as Brevard County prepares for a massive economic windfall and historic crowds ahead of tomorrow's Artemis II launch.

Local hotels are fully booked and campsites are at capacity as families gather to witness the first crewed lunar mission in over 50 years, an event officials estimate could generate tens of millions of dollars for the regional economy.

To manage the surge, Port Canaveral has implemented strict access plans, announcing that parking day passes for the popular Jetty Park viewing area are officially sold out and no additional public parking will be available on launch day.

For those lucky enough to have pre-purchased passes, admission is still not guaranteed, reflecting the intense demand to see the SLS rocket lift off and inspire a new generation of space exploration.

As NASA moves into the final stages of the Artemis II countdown, the agency has scheduled a critical prelaunch news conference for 1 p.m. ET today.

This briefing will serve as the final official check-in before tomorrow’s historic moon launch, providing the latest "Go/No-Go" status for the Space Launch System (SLS) rocket and the Orion spacecraft.

A key highlight of the briefing will be the updated weather outlook from Mark Burger, the launch weather officer with the 45th Weather Squadron. While the forecast has held steady at 80% favorable, Burger will provide a deep dive into any emerging atmospheric concerns—such as cloud thickness or coastal winds—that could impact the 6:24 p.m. launch window.

Along with a representative from the launch team, officials will walk through the remaining milestones as four astronauts prepare to embark on humanity's first crewed journey to the lunar vicinity in over five decades.

As the countdown clock ticks toward Wednesday’s historic 6:24 p.m. ET liftoff, the latest forecast from the U.S. Space Force’s 45th Weather Squadron remains a promising 80% "Go" for the Artemis II mission.

Latest launch weather forecast from the Space Force 45th Weather Squadron.

While meteorologists are keeping a close watch on a weakening front and the potential for gusty winds or low-level clouds at the Kennedy Space Center, the majority of the hazardous weather is expected to stay well south of the launch pad.

With all systems currently "green" and the SLS rocket standing ready on Pad 39B, the primary concern for the two-hour launch window remains the specific cloud thickness and wind constraints required to ensure a safe flight for the four-person crew as they begin humanity's first return to the lunar suburbs in over 50 years.

To get the Artemis II mission off the ground, NASA isn’t just looking for a clear sky; they are following a strict "Go/No-Go" checklist where even a minor weather shift can trigger a scrub.

Safety is the top priority for the SLS rocket, which cannot fly through any rain or even a smoke plume.

NASA utilizes specific launch weather criteria to determine whether or not Artemis II is safe for liftoff.

Wind speeds are also under a microscope: peak liftoff winds must remain below a range of 33 to 45 mph at various altitudes up to 457.5 feet.

Temperatures are monitored just as closely at two different heights above the pad; the mercury must stay above 41.4°F at all times and cannot exceed 94.5°F for more than 30 minutes, ensuring the rocket's sensitive components and propellants stay within their operational limits.

The lightning rules are perhaps the most complex hurdle for the Space Coast team. Artemis II will stay grounded if lightning is detected within 10 nautical miles of the flight path, requiring a 30-minute clear window before even considering a reset.

This caution extends to the clouds themselves; the mission will not fly through thick cloud layers (over 4,500 feet) that extend into freezing temperatures, nor will it venture near thunderstorm debris or disturbed weather clouds that could trigger a strike.

Even space weather is a factor—severe solar activity that could scramble electronics or kill radio communication is enough to keep the crew on the Earth's surface.

On launch day, it’s not just about the sunshine; it’s about navigating a precise keyhole in the atmosphere.