Canada's all-time September record now shared by three communities

The all-time heat record for September in Canada now has three shareholders, with Lytton, B.C., the newest community to tie it with a 40°C reading on Tuesday

For the first time in 85 years, Canada reached 40 degrees in September.

An exceptionally warm temperature was reached in B.C. on Tuesday, with the preliminary high in Lytton reaching 40°C, now atop with two other communities for the warmest temperature on record in Canada for September.

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Lytton shares the current, all-time September high with Morden, Man. (1906), and Lost River, Sask. (1940). The record is still in jeopardy of being toppled in B.C. this week, though, as the heat will peak on Wednesday.

Lytton, B.C., hottest September temperature (tied with two other cities) 2025

As well, both Lillooet (38.8°C) and Ashcroft (38.3°C) set monthly temperature records, but the temperatures on Tuesday ticked even higher for Ashcroft.

Tuesday's high temperatures

  • Lytton: 40.0°C

  • Ashcroft: 39.1°C

  • Princeton: 38.8°C

  • Kamloops: 36.8°C

  • Lillooet: 36.5°C

Lytton's 40-degree reading also usurps the previous B.C. September record, a recognition it also held (39.6°C) in 2022. The month’s hottest reading on record down in Vancouver was a 29.3°C day back in 1988.

B.C. September maximum temperatures for Sept. 2, 2025

Hot weather safety tips

Extreme heat affects everyone. Sensitive groups are especially vulnerable to heat-related illnesses, but even healthy folks are susceptible to heat exhaustion or worse in extreme heat.

Explainer: Heat Stroke, heat exhaustion symptoms, health, heat wave
  • Drink plenty of water. Avoid caffeine and alcohol, which can be dehydrating.

  • Avoid direct sunlight, especially during peak hours and when the UV rating is high.

  • Wear lightweight, loose-fitting clothing.

  • Use air conditioning when possible. If you do not have access to air conditioning, consider visiting a cooling centre, a shopping centre, or a public library.

  • Check on elderly relatives and other vulnerable neighbours.

With files from Tyler Hamilton, a meteorologist at The Weather Network.

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