For the second week in a row, the forecast kind of fell apart. The culprits this time around were a couple of innocent small upper-level lows.
Last issue’s forecast began with mention of some slight instability. Well, that instability manifested itself as an upper low that tracked through our region on Aug. 15, setting off several rounds of thunderstorms.
Then a second upper-level low moved through on Aug 18, bringing more showers and thunderstorms. While we did see some heat build behind these systems, the lows helped change the overall pattern, weakening the building ridge of high pressure.
Read Also
Canadian canola prices hinge on rain forecast
Canola markets took a good hit during the week ending July 11, 2025, on the thought that the Canadian crop will yield well despite dry weather.
This forecast period looks to start with a broad area of weak high pressure to our north and northeast. This will place us in a south to southeasterly flow, bringing sunny to partly cloudy skies along with warm temperatures.
Expect daytime highs to be in the mid- to upper 20s with overnight lows only dropping into the mid-teens. By the weekend, the weather models show a strong area of low pressure tracking across the northern Prairies. This low should help pull some very warm air, with daytime highs forecasted to be in the upper 20s to low 30s.
Moisture will also be pulled northward by this low, which may result in thunderstorms early in the weekend.
As the northern low moves to the east on Sunday or Monday, a cold front will drop southeastward, bringing with it cooler temperatures along with a fairly good chance of showers and thunderstorms.
It looks like the last few days of August will be on the cool side as arctic high pressure drops southward behind the northern low. Expect partly cloudy skies along with daytime highs around the 20 C mark and overnight lows falling into the 6 to 10 C range.
Looking further ahead to the September long weekend, the weather models hint at a return to warm summer-like temperatures.
Usual temperature range for this period: highs, 18 to 28 C; lows, 6 to 14 C.
