If you search sunset today, you usually want one simple answer: What time will the Sun go down where I am? The catch is that there is no single worldwide sunset time. Sunset depends on your exact location, date, latitude, longitude, time zone, season, and atmospheric conditions.
Quick answer: Sunset today is the local time when the Sun’s upper edge appears to disappear below the western horizon. The exact time varies by location and date because Earth rotates on its axis while orbiting the Sun. Atmospheric refraction also makes the Sun remain visible slightly longer than simple geometry would predict.
For example, in Karachi, Pakistan, on September 12, 2026, sunset is approximately 6:39 PM local time, with sunrise at about 6:16 AM. That produces roughly 12 hours and 22 minutes of daylight.
What Time Is sunset today?
The exact sunset today time depends first and foremost on where you are.
Someone in Karachi, London, New York, Sydney, or Tokyo will see sunset at a different local time—even on the same calendar date. Two cities within the same country can also have noticeably different sunset times.
To find today’s sunset accurately, you need three basic pieces of information:
- Your location — ideally the city or precise latitude and longitude.
- Today’s date — sunset shifts throughout the year.
- Your local time zone — including daylight-saving adjustments where applicable.
Sunset calculators combine these details with astronomical calculations involving the Sun’s position relative to Earth.
The NOAA Solar Calculator, for example, calculates apparent sunrise, apparent sunset, solar noon, solar elevation, and azimuth from a selected location, date, and time.
Example: Sunset Today in Karachi
For a real-world example, consider Karachi on September 12, 2026:
| Solar event | Approximate local time |
|---|---|
| Astronomical twilight begins | 5:00 AM |
| Nautical twilight begins | 5:27 AM |
| Civil twilight begins | 5:53 AM |
| Sunrise | 6:16 AM |
| Solar noon | 12:28 PM |
| Sunset | 6:39 PM |
| Civil twilight ends | 7:02 PM |
| Nautical twilight ends | 7:28 PM |
| Astronomical twilight ends | 7:55 PM |
The daylight period is approximately 12 hours, 22 minutes, and 29 seconds.
This example also highlights something people often miss: sunset does not mean instant darkness.
What Does Sunset Actually Mean?
Astronomically, sunset is associated with the Sun passing below the horizon, but the commonly published sunset time accounts for more than the geometric center of the Sun.
NOAA calculations use a solar zenith of approximately 90.833° for sunrise and sunset. This incorporates an approximate correction for atmospheric refraction and the apparent size of the solar disk.
That distinction matters because the Sun is not a tiny point of light.
When you watch a sunset, the lower portion of the solar disk disappears first. The published sunset time generally corresponds to the apparent disappearance of the Sun’s upper edge.
Apparent Sunset vs. Geometric Sunset
The atmosphere bends sunlight.
This phenomenon is called atmospheric refraction. When sunlight enters Earth’s atmosphere, its path bends slightly, making the Sun near the horizon appear higher than its geometric position.
As a result, you can still see the Sun even when it has technically moved below the horizon.
NOAA explains that apparent sunset therefore occurs slightly later than it would without atmospheric refraction. Changes in air pressure, humidity, temperature, and other atmospheric conditions mean the exact observed moment can differ slightly from a calculated time.
Quick Takeaway: The sunset time on your phone or weather service is an astronomical calculation. What you actually observe can vary slightly because the real atmosphere and your visible horizon are not perfectly uniform.
Why Does sunset today Change Every Day?
If sunset was at 6:39 PM today, you should not assume it will also be 6:39 PM tomorrow.
Sunset changes because Earth has two important motions: it rotates on its axis and orbits the Sun. Earth’s axis is also tilted relative to its orbital plane.
Together, these factors change the Sun’s apparent path across the sky throughout the year.
Earth’s Axial Tilt Creates Seasonal Changes
Earth’s axial tilt is the main reason daylight duration changes with the seasons.
During the summer portion of the year for a hemisphere, the Sun follows a longer apparent path above the horizon. Days are generally longer and sunsets tend to occur later.
During winter, the Sun follows a shorter path. Daylight decreases and sunset generally arrives earlier.
Spring and autumn fall between those extremes.
Sunset Can Shift From One Day to the Next
Daily changes may seem tiny, but they accumulate.
Karachi provides a useful September example. Timeanddate’s astronomical data shows sunset moving from approximately 6:39 PM on September 12 to 6:38 PM on September 13, 6:37 PM on September 14, and 6:36 PM on September 15, 2026.
The daylight duration is decreasing at roughly 1 minute and 25 seconds per day during this period.
That does not mean every location loses the same amount of daylight each day. Latitude and season strongly affect the rate of change.
Why Location Changes Sunset Time
Your geographic position is one of the biggest factors determining sunset.
Two coordinates are particularly important: latitude and longitude.
Longitude
Longitude describes your east-west position on Earth.
Because Earth rotates from west to east, places farther east generally experience the Sun’s daily events earlier in astronomical terms than places farther west.
However, clock time complicates this relationship.
Large regions often share the same official time zone. A city near the eastern edge of a time zone can therefore experience sunrise and sunset noticeably earlier by the clock than a city near its western edge.
Latitude
Latitude measures how far north or south you are from the equator.
It has an enormous influence on seasonal daylight.
Near the equator, sunrise and sunset remain comparatively consistent throughout the year. At higher latitudes, the seasonal differences become much larger.
Far enough north or south, locations can experience extremely long summer days and extremely short winter days.
Within the polar circles, the Sun may remain above the horizon continuously during part of summer or below it continuously during part of winter.
This is why a search for sunset today must be location-specific.
Sunset, Dusk, and Twilight Are Not the Same Thing
One of the most common misunderstandings about sunset is assuming that sunset equals nightfall.
It doesn’t.
After the Sun disappears below the horizon, scattered sunlight continues illuminating the sky. This transition between daylight and darkness is called twilight.
Astronomers divide twilight into three stages.
| Stage | Sun below horizon | What you typically experience |
|---|---|---|
| Civil twilight | 0°–6° | Plenty of residual outdoor light |
| Nautical twilight | 6°–12° | Horizon becomes harder to distinguish |
| Astronomical twilight | 12°–18° | Sky becomes increasingly dark |
| Night | More than 18° | Minimal remaining sunlight |
NOAA defines astronomical twilight as the period when the Sun is 18° below the horizon, corresponding to a solar zenith angle of 108°.
What Is Civil Twilight?
Civil twilight begins immediately after sunset in the evening.
During this period, the Sun is less than 6° below the horizon. There is normally still substantial natural light, particularly with a clear sky and open horizon.
For everyday planning, civil twilight is often more useful than sunset itself.
If sunset occurs at 6:39 PM but civil twilight continues until 7:02 PM, you don’t suddenly move from bright daylight to complete darkness at 6:39.
What Is Nautical Twilight?
Nautical twilight follows civil twilight.
The Sun is between approximately 6° and 12° below the horizon. The sky becomes considerably darker, although some glow may remain around the horizon.
The name has historical connections with navigation, when sailors used visible stars and the horizon to determine their position.
What Is Astronomical Twilight?
Astronomical twilight is the final stage before full astronomical night.
It occurs while the Sun is approximately 12° to 18° below the horizon.
Once the Sun falls more than 18° below the horizon, astronomers generally consider astronomical night to have begun.
How Is Today’s Sunset Time Calculated?
Modern sunset calculations are based on astronomical models rather than someone physically observing the Sun every evening.
The calculation considers factors such as:
- Latitude
- Longitude
- Calendar date
- Solar declination
- Equation of time
- Solar hour angle
- Time-zone offset
- Approximate atmospheric refraction
- Apparent solar disk size
NOAA states that its solar calculations are based on equations from Jean Meeus’s Astronomical Algorithms.
For sunrise and sunset, NOAA uses an approximate zenith angle of 90.833°. The hour angle can then be calculated from latitude and solar declination before converting the result into a sunrise or sunset time.
You do not need to perform these equations yourself simply to check when the Sun sets. They matter because they explain why reputable astronomical calculators can provide times down to the minute for specific coordinates.
How Accurate Are Sunset Calculations?
For most everyday uses, calculated sunset times are highly useful.
NOAA’s calculation documentation says its theoretical sunrise and sunset calculations are accurate to within about one minute between latitudes of ±72°, with larger potential differences outside that range. Actual observed times can still differ because atmospheric conditions vary.
There is another practical variable: your horizon.
A theoretical calculation assumes an astronomical horizon. In real life, your view may contain:
- Mountains
- Buildings
- Trees
- Hills
- Cliffs
- Elevated terrain
If a mountain blocks the western horizon, for example, you may see the Sun disappear well before the published astronomical sunset.
Likewise, observing from an elevated location can alter when the visible Sun disappears.
How to Find sunset today for Your Location
The most reliable method is to use a location-aware astronomical or weather service.
Enter or select your city, confirm the date, and check that the displayed time zone is correct. If you’re traveling, don’t rely on the sunset time saved for your home city.
A dedicated solar calculator can provide much more than a single time. Depending on the service, you may see sunrise, sunset, solar noon, day length, civil twilight, nautical twilight, astronomical twilight, solar altitude, and azimuth.
NOAA’s calculator, for example, accepts latitude, longitude, date, local time, and time-zone information to calculate solar events and position.
Check the Time Zone Carefully
Time zones are crucial because sunset calculations ultimately need to be converted into local clock time.
NOAA’s current convention defines the time-zone offset as the number of hours added to UTC to obtain local time.
Daylight Saving Time can complicate matters in countries that use it.
If clocks move forward by an hour, the Sun obviously has not changed its physical movement overnight. Instead, the clock used to describe sunset has changed.
That is why a sunset may suddenly appear an hour later by the clock when daylight-saving rules take effect.
When Is the Best Time to Watch a Sunset?
If you’re planning photography, sightseeing, a walk, or simply want to watch the sky change color, don’t arrive exactly at the published sunset time.
A better rule is to arrive 20–30 minutes before sunset.
That gives you time to find a clear western view and watch the changing light as the Sun approaches the horizon.
Stay after the Sun disappears, too.
Some of the most dramatic sky colors can develop during civil twilight as sunlight continues interacting with the atmosphere while the Sun moves farther below the horizon.
For photography, this period overlaps with what is commonly called the golden hour and the transition toward blue hour. Neither term is identical to astronomical sunset or twilight, but they are useful descriptions of changing natural light.
Which Direction Does the Sun Set?
People often say the Sun rises in the east and sets in the west. That’s broadly correct, but the precise direction changes during the year.
The sunset azimuth depends on your latitude and date.
For example, Karachi’s September 12, 2026 sunset is listed at approximately 275°, slightly north of due west. Sunrise is around 85°, slightly north of due east.
Around an equinox, sunrise and sunset occur comparatively close to due east and due west. As the seasons progress, those positions shift along the horizon.
This matters when choosing a viewpoint for sunset photography: a location with a perfect western view during one season may not frame the setting Sun the same way several months later.
Why Today’s Sunset May Look Different From Yesterday’s
The calculated time isn’t the only thing that changes.
Clouds, dust, haze, humidity, aerosols, and other atmospheric conditions affect the appearance of a sunset. The same location can produce a brilliant orange-red sky one evening and a muted gray sunset the next.
Atmospheric refraction also varies somewhat with conditions.
That is why astronomical calculations should be treated as the expected time of the solar event rather than a guarantee of exactly what you will visually observe at a specific second.
NOAA specifically notes that variations in atmospheric composition, temperature, pressure, and other conditions can cause observed values to differ from calculated results.
Does Sunset Happen at the Same Time Every Year?
Not exactly.
Sunset follows a broadly repeating annual pattern, but comparing the same calendar date across different years can reveal small differences.
Calendar structure, Earth’s orbital characteristics, leap years, and the equation of time all play a role in the precise result.
For ordinary planning, those differences are generally small. But if you need an accurate sunset for photography, astronomy, outdoor events, travel, or another date-sensitive activity, check the specific location, date, and year rather than relying on last year’s time.
What to Remember About sunset today
sunset today is not a universal clock time. It is a location-specific astronomical event determined mainly by your latitude, longitude, date, solar position, and local time zone.
The published sunset marks the apparent disappearance of the Sun at the horizon, with calculations accounting approximately for atmospheric refraction and the solar disk. Darkness comes later as the evening passes through civil, nautical, and astronomical twilight.
For an accurate answer, check a current solar calculator using your actual location and today’s date. And if you’re heading outside to watch the sunset, arrive 20–30 minutes early and stay through civil twilight—the most interesting light often extends beyond the official sunset time.