Patchy frost possible in Halifax as temperature drop for fall
Posted Sep 23, 2026 11:29:56 AM.
Halifax Regional Municipality is entering autumn as leaves begin to change and the air gets crisp.
On the first full day of fall, Environment Canada issued a frost advisory as temperatures are expected to drop overnight. According to the weather agency, a frost cover is possible on Wednesday through Thursday as skies clear in the evening.
Patchy frost is coinciding with cool temperatures hovering around 3 C. Experts warn people to bring in heat-sensitive plants or cover them up.
Temperatures are expected to rebound on Thursday rising to a high of 18 C, and lowering overnight to 6 C.
The weekend is likely to be rainy with highs around 17 C.
What to expect this fall
CityNews Chief Meteorologist Natasha Ramsahai says a “good chunk” of the country is expected to be drier than average or average in terms of snow and rain.
Parts of Atlantic Canada, she said, will be closer to average in terms of temperatures.
Ramsahai explains that there are dozens of “teleconnections” that can affect how the season will play out. Which are meteorological occurrences in one part of the world, the impacts of which are felt in another part.
The most familiar teleconnection is the El Niño climate pattern which develops as a result of above-average sea surface temperatures in a defined area of the Pacific Ocean known as the Niño 3.4 region.
As of Sept. 20, the Niño 3.4 region is 3.05 C above average, which means it has surpassed “super El Niño status.”
“And it hasn’t even reached its peak yet, its going to continue to strengthen through November and December,” said Ramsahai.
The North Atlantic Oscillation is a weather pattern that is created by changes in atmospheric sea-level pressure between theAzores High and the Icelandic Low over the North Atlantic Ocean.
Ramsahai says the NAO is currently in a neutral phase.
This means the typical “blocking pattern” that’s expected with the Jetstream over Greenland, which keeps the cold air injections coming over southern Ontario and keeps the warmth to western Canada might not occur and that warmth can spread all across the country.
