Does Cloudy Weather Change a Calculated Prayer Timetable?

A cloudy sky is not a timetable setting

AL-Naqawa does not take live cloud cover as an input to its prayer-time calculation. For the same city, date, method and other settings, a weather change does not itself change the calculated timetable.

This describes how this website works. It is not a ruling about observation or the religious use of a timetable; consult a qualified local teacher for that question.

Calculated events and what you can see

The US Naval Observatory explains rise and set using a defined horizon and average atmospheric conditions. It also notes that actual twilight illumination depends on atmospheric conditions, clouds and the visible horizon.

A dark-looking sky or a sun hidden behind clouds therefore is not, by itself, a measurement of the Sun’s calculated position. Buildings and hills can also affect what is visible from a particular window. These distinctions matter when comparing a photograph with an astronomical timetable.

Check the inputs before moving a time

If a time looks surprising, start with the selected location and date. Then record the calculation method, Asr rule, high-latitude setting and any manual adjustments. Those are reproducible inputs; a general description such as “it looks dark” leaves the comparison unclear.

• Confirm the city rather than relying only on your device location.
• Read the timetable’s date and time zone.
• Keep the method and adjustments visible in your note.
• Compare with a local timetable whose settings or authority you can identify.

Do not turn an observation into an unexplained correction

Avoid adding or subtracting minutes solely to make the screen match the brightness outside. If you follow a local mosque’s timetable, record that source and ask about differences rather than guessing at a weather correction.

The website provides calculated prayer starts, not a live atmospheric observation or the mosque’s congregation schedule. Cloud cover is also a different issue from high-latitude dates on which a solar event is unavailable.