Thunderstorm risk and above-seasonal warmth kick off October in Northwestern Ontario

Sioux Lookout begins the month of October on a mild and mostly cloudy note, with temperatures already at 13°Cand a chance of showers or even a morning thunderstorm. Winds from the south will strengthen today, boosting temperatures into the mid-20s and bringing a humidex of 27°C — far above the seasonal average. More shower chancesand a risk of thunderstorms return tonight and linger through Friday.

Current Conditions

• Observed at: Sioux Lookout Airport

• Time: 5:00 AM CDT

• Temperature: 13.0°C

• Dew Point: 8.5°C

• Humidity: 74%

• Wind: SSE at 10 km/h

• Visibility: 24 km

• Pressure: 102.2 kPa (falling)

• Condition: Mostly Cloudy

Today’s Weather Overview

Wednesday, October 1:

• A mix of sun and cloud with a 40% chance of showers this morning and early afternoon.

• Risk of a thunderstorm early this morning.

• Winds becoming south at 20 km/h by late afternoon.

• High: 24°C, with a humidex of 27°C

• UV Index: 4 (moderate)

Tonight:

• Clear early this evening, becoming partly cloudy overnight.

• 60% chance of showers late this evening and overnight.

• Risk of a thunderstorm developing overnight.

• Winds south at 20 km/h.

• Low: 16°C

Extended Forecast

Thursday, October 2:

• Mainly cloudy, with a 30% chance of showers early in the morning.

• Risk of a thunderstorm before skies clear in the afternoon.

• Winds southwest at 20 km/h.

• High: 26°C, humidex: 27

• UV Index: 4 (moderate)

• Night: Cloudy periods, 30% chance of showers.
  Low: 13°C

Friday, October 3:

• Cloudy, with a 60% chance of showers.

• High: 22°C

• Night: Remaining cloudy with a 60% chance of showers.
  Low: 14°C

Wardrobe Recommendations

• Mornings:

  • A light rain jacket or umbrella may be useful with potential showers or early thunderstorms.

• Afternoons (Oct 1–2):

  • Dress for late summer warmth — short sleeves and breathable fabrics are ideal with humidex values near 27°C.

• Evenings:

  • Light sweater or windbreaker should be enough, especially if you’re out later when temps dip into the mid-teens.

Weather Trivia

Did you know?
Sioux Lookout’s average high for October 1st is around 13°C — meaning today’s forecast high of 24°C is more than 10°C above normal. Warm southern winds and a strengthening jet stream aloft are responsible for this early-October heat, which is also helping fuel thunderstorm activity — a rare but not unheard-of feature this time of year.

Stay weather-aware today with thunderstorm chances around and keep enjoying this unusual October warmth!For more updates, stay tuned to the NetNewsLedger Weather Desk.