It’s the first day of fall. Here’s how much daylight Idaho will lose this season

College football season is in full swing in Idaho, and pumpkin spice lattes have returned to coffee shops everywhere.

Now autumn has officially started.

How much daylight will we lose this fall? And what weather is in store as the season begins?

Here’s what to know:

When is the first day of fall in 2025?

The autumn equinox marks the first day of fall in the Northern Hemisphere.

In 2025, the fall equinox landed on Monday, Sept. 22.

What is an equinox?

Due to the Earth’s tilted axis, the sun normally “illuminates the Northern or Southern hemisphere more” depending on where our planet is along its orbit, according to Royal Museums Greenwich.

During an equinox, the sun shines right over the equator, NASA said, resulting in roughly equal amounts of sunlight in both hemispheres.

“Equinoxes ... are the only times of the year when the Earth’s North and South Poles are simultaneously lit by sunlight,” astronomer Kat Troche wrote on NASA.com.

What does the word ‘equinox’ mean?

The word “equinox” comes from the Latin and means “equal night,” NASA explained.

This is because the entire planet gets nearly the same amount of daylight on the spring and fall equinoxes.

What time will the sun rise and set on fall equinox?

On Monday, the sun rose in Idaho at 7:32 a.m., according to online clock Time and Date.

Sunset will occur at 7:41 p.m. Monday.

How quickly will Idaho lose daylight?

The rate at which Idaho loses daylight speeds up as time goes on — peaking in the days around the fall equinox.

Boise will lose two minutes and 57 seconds of daylight a night in the week before and after the equinox.

By the end of October, the sun will set in Boise just before 6:30 p.m., according to Time and Date.

Daylight saving time ends on Sunday, Nov. 2, shifting clocks back by an hour. Sunset will fall around 5:30 p.m. in the days following the clock change.

What’s the fall weather forecast for Idaho?

What kind of weather can you expect in Idaho this fall?

According to the National Weather Service’s three-month outlook, Idaho is likely to experience warmer-than-average temperatures in September, October and November.

The Gem State has an equal chance of above- and below-average rainfall, according to the weather service.

The Old Farmer’s Almanac predicted that daho will see “warm, dry” conditions in the fall.

This story was originally published September 16, 2025 at 5:00 AM with the headline "It’s the first day of fall. Here’s how much daylight Idaho will lose this season."