Environment and Climate Change Canada (ECCC) says "unseasonably high temperatures" were felt across B.C. Interior on Sept. 17, helping produce daily heat records in multiple communities.
Ashcroft, Kelowna, Vernon, Penticton, Summerland, Salmon Arm, Kamloops, and Clearwater all set their own new marks for the day.
In Kamloops, temperatures reached 34 C. That shattered the city's previous record of 32.2 C for the day set in 1937.
Kelowna, Penticton, Summerland and Vernon all experienced daily highs of 31 C on Wednesday, breaking their old records by about one degree.
Clearwater reached a mark of 32.1 C, surpassing its previous mark of 31 C for the day.
Salmon Arm, meanwhile, barely broke its daily heat record for Sept. 17. The community experienced a high of 29.5 C, breaking the mark of 29.4 C set in 1937.
Cache Creek and Ashcroft tied a record set in 1981 of 32.5 C. Records in this area have been kept since 1944.
The warmer-than-normal temperatures across the region were due to a "strong ridge of high pressure," according to ECCC.
Daytime temperatures across the Okanagan Valley are expected to hover around 30 C on Sept. 19 and 20, the federal forecaster added.
The last official day of summer, Sept. 21, could see daytime temperatures reach 21 C and overnight drops to 9 C.
Autumn starts Monday with a daytime forecast of 18 C and a mix of sunshine and clouds.
