Tuesday, March 10th, 2026 · 21st Ramadan 1447H
Iftar Time Today
Iftar in Naperville, Illinois, CST/CDT, using NOAA algorithms
Sehri Ends
05:42
When fasting begins today
MWL Method
Uses the Muslim World League standard (18° astronomical twilight), widely accepted globally.
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Check PriceIftar time in Naperville is based on the astronomical sunset at 41.7°N, 88.2°W. This timing already accounts for atmospheric refraction, marking the moment the sun appears to dip below the horizon.
Local Confirmation: While our Iftar times are accurate, we recommend checking with your local mosque for any community-specific adjustments or moon sighting variations.
Today's fast in Naperville lasts 11h 37m, which is approximately 100 minutes longer than at the start of Ramadan. Fasting hours are increasing gradually as daylight lengthens in the spring season.
At 41.7°N and 216m elevation in the Chicago timezone, Naperville is in the temperate zone, where seasonal daylight changes are noticeable. During Ramadan in spring, fasting hours increase by about 5 minutes each day. Your elevation adds roughly 0.8 minutes to sunset timing.
By mid-Ramadan (day 15), you'll have gained an extra 75 minutes of fasting compared to the first day. Compared to Joliet at 41.5°N, this results in about 1 minutes of difference. These gradual daily changes are a defining feature of fasting in Naperville.
Naperville's sunset is approximately 4 minutes earlier than Rockford, primarily due to longitude differences between the cities.
Naperville's sunset is approximately 1 minute later than Kenosha, primarily due to longitude differences between the cities.
Naperville's sunset is approximately 1 minute later than Racine, primarily due to longitude differences between the cities.
In Naperville, sunset shifts slightly. Specifically, today's sunset occurs 1m later than yesterday.
Tomorrow's fast will be approximately 5 minutes longer than today in Naperville, following the seasonal daylight pattern at 41.7° latitude. This daily progression is characteristic of Naperville's temperate latitude position, where seasonal astronomical shifts directly affect fasting duration throughout Ramadan.
Earth's atmosphere bends light, causing the sun to appear slightly higher on the horizon than its actual position. This atmospheric refraction effect is already accounted for in our calculations, giving you the precise moment when the sun appears to cross below the horizon.
At 216m above sea level, Naperville's elevation affects when sunset occurs. Higher elevations see the sunset slightly later than lower areas. This elevation adjustment is included in all our calculations.
Iftar times are calculated using precise astronomical algorithms from NOAA, based on Naperville's exact location (41.75°N, 88.17°W), timezone (America/Chicago), and the current season to determine accurate sunset times throughout Ramadan.
Iftar in Naperville today is the astronomical sunset time shown at the top of this page. Check the precise time, which is calculated for Naperville's exact location (41.75°N, 88.17°W) at 216m elevation. The calculation uses the ISNA 15° method, which is standard across North America.
Sehri end time in Naperville marks when the fast begins in the morning. During Ramadan, this time shifts daily as sunrise moves earlier or later. The time shown on this page is calculated for Naperville's exact coordinates using the ISNA 15° method, though you can compare other calculation standards on this page.
At 41.7°N, Naperville experiences moderate seasonal variation in daylight, affecting fasting duration throughout Ramadan. Fasting hours in Naperville vary daily throughout Ramadan as sunset and Fajr shift with the season. The times shown on this page are calculated for Naperville's exact location so you can plan your fast accordingly.
Naperville and Joliet share nearly identical sunset times due to their close proximity. The primary cause is the longitude difference between the cities — roughly 4 minutes of time difference per degree of longitude. Naperville is at latitude 41.75°, while Joliet is at latitude 41.52°. Even small differences in latitude and elevation create measurable shifts in when sunset occurs.
The ISNA 15° method is most commonly used by mosques in Naperville. However, the best method for you depends on your local mosque or Islamic authority. We provide multiple standards on this page: ISNA 15°, ISNA 15°, Umm al-Qura 18.5°, and Diyanet 20°. Check with your mosque to confirm which they recommend, then use that method from the options available above.