Seasonal Pests in Saudi Arabia: A Preventive Calendar for Heat and Rain by Region

Why do pests change with the seasons in Saudi Arabia?

The National Center for Meteorology (NCM) describes the Kingdom's climate as semi-arid to arid desert, with hot days, cool nights and very little annual rain. It gives general temperature ranges for each season: winter (December–February) between 20 and 30 degrees, spring (March–May) between 30 and 40, summer (June–August) between 35 and 45, and autumn (September–November) between 25 and 35.

These figures are general and differ between the coast, the interior and the highlands, but they are enough to explain the logic. Insects respond to temperature, and water is scarce, so any source of water or moisture around a home becomes a magnet in every season.

When does it rain in each region, and why does that matter?

According to the NCM, rain in the north and centre arrives in winter with Mediterranean lows, while the south-west is affected by summer rain linked to the movement of the tropical convergence zone and the seasonal circulation. The NCM notes that the Asir region receives about 300 mm a year, far more than other regions.

A scientific review published in the journal Climate (Hasanean and Almazroui, 2015) summarises that rainfall in the Kingdom is concentrated in the north and centre between October and April, and that the south-west receives rain in every season with a spring maximum, while summer is almost rain-free in the north-east and north-west.

Why does this matter? Because standing water after rain, even in a tank lid or a plant saucer, is a mosquito breeding site. The Ministry of Health recommends removing standing water inside and outside the home, and cleaning water tanks, basins and plant trays weekly to prevent the mosquitoes that carry dengue fever.

Which seasonal pests appear in Saudi Arabia in each season?

What does the Saudi summer do to insects?

Heat speeds up life cycles. The UC Statewide IPM Program says a house fly can develop from egg to adult in as little as seven days in ideal summer heat, laying its eggs in warm, moist organic material such as rubbish, manure and rotting vegetables. That is why waste management matters more than any pesticide in summer.

Scorpions are nocturnal by nature and hide by day under stones, timber and rubble, and the same programme notes they are attracted to moisture around homes. In summer, leaking air-conditioner water and irrigation basins become clear targets; see scorpion control around the home for the steps that keep them out, and never handle them by hand.

Flies need their own plan, which starts at the breeding source rather than with spraying, covered in house fly control at home.

What changes after rain in the north, centre and south-west?

Two main problems appear after rain. The first is mosquitoes: the Ministry of Health says the vector of dengue is the Aedes aegypti mosquito, which bites mostly in the early morning and before sunset. The World Health Organization links the spread of dengue to factors including higher temperature, heavy rainfall and humidity, and recommends covering, emptying and cleaning household water storage containers weekly.

The second is flying termites: the UC IPM programme says the most common subterranean termite there usually flies on afternoons in spring or autumn on clear days after heavy rain, and that seeing swarms does not always mean a building is infested. Species and timing in the Kingdom may differ, but the rule is the same: a swarm is a signal to inspect, not to panic. Details are in flying termites at home.

Residents of Abha, Khamis Mushait, Jazan and Najran need longer vigilance, because the south-west receives rain in several seasons, not winter alone. Mosquito prevention there is a year-round subject; see mosquito control and dengue prevention.

How do you build a yearly prevention plan for your home?

1. 1

   End of winter: check timber and foundations

   Before the flying-termite and spring insect season, inspect wooden doors and the perimeter of the building.

2. 2

   Spring: prepare for summer

   Seal cracks and service openings, fit drain covers, and repair air-conditioning leaks before the peak heat.

3. 3

   Summer: waste and moisture

   Use tightly lidded bins emptied regularly, and keep rubble and timber away from walls to reduce scorpion hiding places.

4. 4

   Before the rainy season: standing water

   Clean roofs and gutters, turn over open containers and cover tanks.

5. 5

   After every rain: a quick walk-round

   Look for any standing water within days and remove it, and watch for flying swarms near windows.

For businesses and compounds, visits under an annual pest control contract can be tied to this calendar, with more visits before summer and after rain instead of spreading them evenly across the months.

At Azl we coordinate the work through trained technicians following municipality requirements, using pesticides registered with the Saudi Food and Drug Authority, with a written treatment report and re-entry times. Request a seasonal inspection through our pest control service, or in the south through pest control in Abha and pest control in Jazan.