If you do not like the heat, enjoy today! It will be perfectly sunny and high temperatures will be seasonal in the mid 20's. Humidity will not be an issue.
Things reheat tomorrow as high pressure moves off to our east and we get back into some ridging in the jet stream allowing a strong southerly flow to return to southern Manitoba. Highs between 29 and 31°C are expected in the Winnipeg area. There will be a slight chance of a shower or storm in the evening... however the best risk will be in southwestern/western Manitoba and the Interlake. A severe storm or two will be possible in these areas.
Nocturnal thunderstorms will be possible across all of southern Manitoba Friday night into Saturday morning. The main threats with these will be flooding rains, large hail and strong wind gusts. We will then see some sun for the rest of the day with temperatures likely reaching the low 30's. Humidity will be high with humidex values reaching the high 30's to near 40. Some thunderstorms are possible again in the afternoon and evening, however capping looks like an issue and may limit storm development.
Storms look possible again Saturday night and Sunday, but that's still a little too far off to be more specific. Will update on this potential when it is more clear. What is clear is that the heat looks to stay with highs in the low 30's Sunday. Above seasonal temperatures are expected to continue well into next week.
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Photo in this post was taken by me in Brandon in July 2008