Last week’s forecast got the general big picture right, but had trouble with the timing and behaviour of the upper low that moved through our region late last week and into the early weekend.
For this forecast period it looks like we’ll start off sunny and hot, with a building upper ridge of high pressure sliding across our region. Wednesday and Thursday should be mainly sunny with high temperatures in the low 30s. There is a slight chance of some thunderstorms overnight Wednesday as a warm front pushes through.
On Friday and Saturday we’ll see increasing southerly winds and an increase in humidity as an area of low pressure develops to our west. Friday currently looks like it will be warm and humid with plenty of sunshine. By Saturday, the approaching low will lead to increasing clouds and a good chance of thunderstorms overnight Saturday and into Sunday morning as the low slides through.
Monday will see some cooler air move in behind the low, with high temperatures expected to be in the low 20s. We’ll probably see afternoon clouds with daytime heating and colder air aloft. By Tuesday, weak high pressure should be in place, bringing plenty of sunshine and nice temperatures. Things look like they’ll begin heating up a bit again Wednesday, as the western ridge tries to rebuild. Expect sunshine with highs in the upper 20s. Unsettled weather then looks to return late next week before more hot weather moves in over the weekend.
Usual temperature range for this period: Highs, 20 to 30 C; lows, 7 to 15 C.