When is the First Day of Fall 2025 for the US?
For residents of North America, the autumnal equinox, or the first day of fall, is right around the corner. Meteorologically speaking, autumn is already here. Discover when astronomical fall begins and some great weather apps for all seasons.
When does astronomical autumn begin in 2025?
The astronomical definition of autumn or fall is based on Earth's position relative to the sun. The defining moment is the autumnal equinox, which occurs when the sun crosses the celestial equator, resulting in nearly equal hours of daylight and darkness.
Astronomical autumn begins on Monday, September 22, 2025, in the northern hemisphere.
Following the autumnal equinox, which marks the astronomical start of fall, the Northern Hemisphere experiences a shift toward shorter days and longer nights, along with cooler temperatures.
After the equinox, in the northern hemisphere, the Earth tilts away from the Sun. This tilt remains constant at approximately 23.5 degrees. Earth's axis always points in the same direction toward the North Star (Polaris). Due to the tilt away from the Sun, the Northern Hemisphere receives less direct sunlight and fewer hours of daylight each day, resulting in colder temperatures.
Simultaneously, the sun's arc across the sky shifts southward. This process continues until the winter solstice, the shortest day of the year, when the tilt away from the Sun is at its maximum.
What is meteorological autumn, and when does it begin?
In 2025, meteorological autumn began on September 1. The definition of meteorological autumn is based on the annual temperature cycle and uses the three full calendar months of September, October, and November to define the season.
The landscape changes as trees and plants prepare for winter. Many deciduous trees change color and shed their leaves in the fall. Many bird and butterfly species begin their migration southward.
Next, let's explore some powerful, free weather apps that are essential for all seasons.
All Weather Mode: Weather Home
All Weather Mode: Weather Home is designed to keep you prepared for any forecast with a clean and intuitive home screen layout. From quick-swipe shortcuts to in-depth forecasts, it’s a faithful companion for navigating daily weather.
Key Features:
Customizable home screen with swipe shortcuts
Real-time temperature, humidity, wind, and visibility reports
7-day and hourly forecasts with precipitation chances
Interactive radar maps for real-time tracking
Sunrise and sunset times for outdoor planning
Stay confident no matter the skies. Download All Weather Mode: Weather Home today and take control of your weather updates.
Weather Mode: Live Weather
Weather Mode: Live Weather keeps you connected to changing conditions with accurate, real-time reporting wherever you are. Whether you’re planning a weekend outing or checking multiple cities at once, this app delivers.
Key Features:
Precise, real-time weather updates
7-day forecasts with highs, lows, and precipitation percentages
Hourly updates for timely decision-making
Location-based weather for multiple saved places
Sunrise and sunset details to plan your daylight hours
Stay ahead of the elements. Download Weather Mode: Live Weather today and experience weather updates you can trust in real time.
Weather Mode: Wallpapers
Weather Mode: Wallpapers brings the beauty of the seasons directly to your device. From the fiery leaves of autumn to snowy winter scenes, every wallpaper is designed to match the world outside—or the mood you want to create.
Key Features:
Seasonal collections that shift throughout the year
High-resolution, vibrant wallpapers handpicked for quality
Holiday- and event-specific backgrounds, from Halloween to New Year’s
Easy-to-use interface for quick wallpaper changes
Upgrade your screen with stunning, seasonal imagery. Download Weather Mode: Wallpapers today and let your device reflect the world’s natural beauty.