EL Nino may bring more rain in Oman as temperatures stay hot

El Niño is a recurring climate pattern involving unusually warm tropical Pacific Ocean temperatures. That warming changes large-scale atmospheric circulation, including winds, pressure and the movement of moisture. These changes can influence weather thousands of kilometres away, including rainfall over Oman. It matters because it can increase the chance of wetter or more extreme conditions in some regions while producing drier conditions in others.

The article links strengthening El Niño to potentially wetter conditions in northern Oman. Historical records from 1980 to 2025 show that rainfall during El Niño periods averaged 20 per cent above normal from September to November, 31 per cent from December to February, and 54 per cent from March to May.

El Niño is not the only influence. Oman’s outlook also considers regional and global climate patterns, and it cannot predict individual storms. For the coming season, temperatures are expected to stay above normal nationwide through December, while northern areas may receive extra rain.

Northern Oman is expected to receive the most noticeable wetter-than-usual conditions. The Civil Aviation Authority forecasts above-average rainfall there during October and November. Rainfall in December should remain close to seasonal averages across most of Oman, although northern areas could still be wetter. This regional difference matters because rainfall is not expected to be evenly distributed across the country.

The outlook also identifies a contrasting pattern along the Arabian Sea coast. Those coastal regions are forecast to receive below-average rainfall in October. The report covers conditions from September 2026 to May 2027, while temperatures nationwide are expected to remain higher than normal through December.

El Niño is likely to strengthen and peak in November and December, but it is only one influence on the forecast. Other regional and global climate patterns also matter. The outlook describes broad seasonal tendencies, not the timing or location of individual storms or rainfall events.

Oman’s historical rainfall increase during El Niño periods varied by season. Records from 1980 to 2025 show an average increase of 20 per cent above normal between September and November. The average rose to 31 per cent from December through February and reached 54 per cent between March and May.

These figures describe broad historical patterns, not a precise forecast for the coming season. The National Multi-Hazard Early Warning Centre uses them as background evidence when assessing possible conditions alongside other climate indicators. They suggest that El Niño’s influence can become stronger during Oman’s later rainfall seasons.

The current outlook expects wetter conditions mainly in northern Oman during October and November. December rainfall should be near seasonal averages across most areas, although northern regions may remain wetter. The centre also warns that seasonal forecasts cannot identify individual storms or specific rainfall events.

Intense rainfall can quickly turn normally dry channels, known as wadis, into dangerous flood routes. If wadis overflow, water may spread into nearby communities and roads. Rainwater can also collect in low-lying areas, disrupting travel and threatening homes, vehicles and other property. These hazards make heavy rainfall a public-safety concern, not merely a water supply benefit.

The outlook warns that some weather systems could bring intense rain together with strong winds, rough seas and hail. Such conditions could make roads hazardous and reduce safety for motorists. Flooding may also occur across several areas when rainfall is concentrated over a short period.

The risks are balanced by possible benefits. Past downpours replenished water resources, increased dam storage and contributed to groundwater reserves. Even so, the coming outlook is seasonal rather than event-specific, so it cannot say when or where a particular flood will occur.

Northern Oman can receive more rain during some El Niño periods because its moisture flows interact with weather systems approaching from the west. This interaction helps explain why El Niño’s rainfall influence is especially noticeable in the north. The pattern is regional, so it does not mean every part of Oman receives the same amount of rain.

Historical records support that distinction. From 1980 to 2025, El Niño periods brought rainfall averaging 20 per cent above normal from September to November, 31 per cent above normal from December to February, and 54 per cent above normal from March to May. The centre presents these as historical trends, not a direct forecast.

The current outlook reflects this regional pattern. Northern Oman is forecast to receive above-average rain in October and November, while Arabian Sea coastal areas may be drier in October. Other climate patterns also influence the final outcome.

Major El Niño-associated weather periods brought both serious disruption and valuable water to Oman. In March 1997, successive heavy rains and thunderstorms produced about 86 millimetres, far above the long-term average of 14.8 millimetres. In March 2016, widespread thunderstorms and heavy rain affected northern governorates.

Between March 7 and 11, 2016, the Al Hamayil low-pressure system helped produce severe weather. Wadis overflowed and flooding affected several areas. Al Mudhaibi recorded 120.4 millimetres, Al Rustaq recorded 105.2 millimetres, and Bahla recorded 101 millimetres. These events disrupted communities and created risks for people and transport.

The same rainfall strengthened water supplies. Dam storage levels increased, and groundwater reserves benefited in affected areas. The examples show why intense rain can be both hazardous and useful, depending on where it falls and how quickly water moves.

Changes in tropical Pacific Ocean temperatures can affect the atmosphere above and beyond the ocean. When Pacific waters become unusually warm, heat and moisture enter the atmosphere and alter pressure patterns. These changes can shift large-scale winds, which guide moisture and weather systems across distant regions. The result can be changed rainfall patterns around the world.

For Oman, the article highlights moisture flows interacting with weather systems approaching from the west, particularly in the north. Historical records show rainfall during El Niño periods averaged 20 per cent above normal from September to November, 31 per cent from December to February, and 54 per cent from March to May.

The effect is not automatic or identical everywhere. Oman’s outlook also considers other regional and global climate patterns. El Niño is expected to strengthen toward November and December, but the seasonal forecast describes broad conditions rather than predicting individual storms or rainfall events.