El Niño Likely by Summer 2026, With Limited Early Impact in Canada

Source: NOAA

A developing El Niño climate pattern could take shape by early to mid-summer 2026, according to the National Oceanic and Atmospheric Administration, but its most noticeable effects in Canada are expected later in the year.

There is a strong likelihood the current neutral conditions in the Pacific Ocean will transition to El Niño in the coming months. While the shift is a significant global signal, its immediate impact on Canadian weather — particularly during the summer — is expected to be limited.

El Niño refers to a warming of ocean surface temperatures in the central and eastern Pacific, a pattern that can influence weather systems around the world. However, in Canada, its influence tends to be weaker during the summer and strengthens into the fall and winter.

During summer 2026, the pattern may contribute to more variable weather across parts of the country, particularly in eastern regions. This could include periods of increased cloud cover and scattered showers, but there is no strong indication of a consistently cooler or wetter season nationwide.

One of the more immediate effects may be felt in the Atlantic hurricane season. El Niño typically increases wind shear over the Atlantic Ocean, which can disrupt storm development. As a result, the risk of tropical storms and hurricanes impacting Atlantic Canada could be lower than average, though not eliminated.

The most notable impacts are expected to emerge later in the year.

Historically, El Niño winters in Canada tend to be milder than normal, particularly across western and central regions. Warmer temperatures can lead to reduced snowfall in some areas, although significant winter storms remain possible depending on how storm tracks evolve.

In eastern Canada, including Ontario and Atlantic Canada, the effects are often less predictable. Seasonal temperatures may end up near or slightly above normal, while precipitation patterns can vary depending on shifting weather systems.