How Climate Change Is Drying Cyprus: A Data-Driven Look

Cyprus has always been dry. The island sits at the eastern edge of the Mediterranean, in a region that receives less rainfall than almost anywhere else in Europe. But the data tells a clear story: dry is getting drier. Rainfall is declining, temperatures are rising, evaporation is accelerating, and the island's 17 major dams are holding less water than at any point in their recorded history.

The rainfall trend

Cyprus receives an average of roughly 460 millimetres of rainfall per year, concentrated overwhelmingly between November and March. This compares to around 700 mm for the EU average, 1,200 mm for the UK, and 2,500 mm for parts of Norway. Even in a good year, Cyprus is water-scarce by European standards.

But the average is misleading. Rainfall variability has increased markedly over the past two decades. The wet winters that used to fill reservoirs reliably are becoming less frequent, while the dry winters that once felt like rare events are now the norm. The 2024–2025 and 2025–2026 winters have both delivered well below average rainfall, leaving dams at historic lows entering the dry season.

Climate records for Cyprus go back over a century, and the trend is unmistakable: the island is receiving less total rainfall per decade. Multiple studies have documented a 10–15% decline in average annual precipitation since the 1970s, with the sharpest drops occurring during the critical winter recharge months.

Rising temperatures, rising losses

It is not just that less rain is falling — what does fall is less effective at recharging reservoirs. Higher temperatures mean more water is lost to evaporation from both the ground surface and the reservoir surface itself. The eastern Mediterranean is warming approximately 20% faster than the global average, with summer temperatures in Cyprus regularly exceeding 40 degrees Celsius.

For dam operators, this is a double blow. A reservoir at 30% capacity in July loses a higher proportion of its remaining water to evaporation than the same reservoir at 60% capacity, because the shallower water body has a higher surface-to-volume ratio. The warmer it gets, the faster small dams empty.

Increased temperatures also raise crop water demand, meaning agriculture needs more irrigation water precisely when less is available. This creates a vicious cycle: hotter, drier conditions reduce supply while simultaneously increasing demand.

What the models predict

Climate projections for the eastern Mediterranean are broadly consistent across modelling frameworks. The Intergovernmental Panel on Climate Change (IPCC) and regional studies from the Cyprus Institute project the following for the 2030–2060 period:

• Rainfall decline of 10–20% compared to the 1980–2010 baseline, with the sharpest reductions in winter
• Temperature increase of 1.5–3 degrees Celsius, depending on global emissions trajectory
• Longer dry seasons, with the wet period starting later and ending earlier
• More intense but less frequent rainfall events, meaning more runoff and flooding but less effective groundwater recharge
• Sea level rise affecting coastal aquifers through saltwater intrusion

For dam levels, these projections translate to a structural downward shift. The historical range of 30–60% system capacity that Cyprus experienced through the 2000s and 2010s may shift to 15–40% as the new normal.

Cyprus's adaptation toolkit

The island is not defenceless. Cyprus has invested heavily in desalination over the past two decades, and desalinated seawater now supplies roughly 70% of domestic drinking water. This reduces direct dependence on dam levels for household taps, but it comes at a cost — desalination is energy-intensive, and running plants at full capacity during a drought strains both the electricity grid and the public purse.

Other adaptation measures include:

• Wastewater reuse: Treated wastewater is increasingly used for agricultural irrigation, particularly in the Famagusta district where Achna dam already functions primarily as a treated wastewater storage facility.
• Groundwater management: Monitoring and regulating borehole extraction to prevent aquifer depletion, though enforcement remains a challenge.
• Demand-side measures: Public awareness campaigns, water pricing structures that penalise heavy use, and building code requirements for water-efficient fixtures.
• Cloud seeding: Cyprus has experimented with cloud seeding programmes to increase rainfall, though the scientific evidence for their effectiveness remains mixed.

What the dam data shows

The latest data on the Nero dashboard provides a window into these long-term trends. Use the year-on-year comparison feature to overlay recent years against earlier periods and see the shift for yourself. The system capacity chart on the dashboard shows the combined fill level across all 17 dams over time — the downward trend in peak winter levels is visible to the naked eye.

Individual dam pages — such as Kouris, the island's largest reservoir — show how specific catchments are responding to the changing climate. Western catchments like Evretou and Kannaviou tend to fare better than eastern ones like Dipotamos and Lefkara, but the overall direction is the same everywhere.

Climate change is not coming to Cyprus — it is already here, written in the falling water levels of every major dam on the island.

Data sourced from the Water Development Department of Cyprus. Updated every 6 hours.