Saudi Arabia weather by month

In Jeddah, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.

The clearer part of the year begins around August 16 and lasts for 3.3 months, ending around November 22. The clearest month is September, when the sky is clear, mostly clear, or partly cloudy 98% of the time on average.

The cloudier part of the year begins around November 23 and lasts for 4.9 months, ending around April 20. The cloudiest month is January, when it is overcast or mostly cloudy 15% of the time.

This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.

Across the year, average wind speed in Jeddah is typically light breeze, near 16 km/h, and varies moderately with the seasons.

The windier part of the year lasts 3.9 months, from around Dec 24 to Apr 22. The windiest month is March, averaging about 18 km/h (light breeze).

The calmer part of the year runs from around Sep 6 to Dec 23, with October the calmest month at about 13 km/h.

Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.

Jeddah receives about 6.1 kWh/m² a day of solar energy on average — intense — with a clear seasonal swing between 4.3 and 7.5 kWh/m².

The brighter stretch of the year lasts 6.7 months, from around Mar 8 to Sep 28. The brightest month is May, averaging about 7.4 kWh/m² (intense).

The dimmest month is December, down near 4.3 kWh/m² — roughly 42% less than the May peak.