Thunder Bay – Weather – Sounds like summer is here today and will start warming it up again by Tuesday. A calm and cool Monday morning greets Thunder Bay with lingering shallow fog and light winds.

Today promises to bring a return to sunshine and seasonal temperatures. However, increasing cloudiness mid-week may bring showers to the region. Here’s a full look at what to expect.

Today’s Weather Overview

Current Conditions

As of 7:00 AM EDT at Thunder Bay Airport:

• Temperature: 10.1°C

• Condition: Shallow fog

• Wind: West at 5 km/h

• Humidity: 97%

• Pressure: 102.0 kPa and rising

• Visibility: 32 km

• Dew Point: 9.7°C

A serene morning with fog patches slowly clearing as the sun rises higher in the sky.

Tomorrow’s Forecast

Expected Conditions

• Today (Mon, Jul 21):
  Mainly sunny skies are expected throughout the day. High near 23°C with a humidex of 26. Winds remain light. UV index is 8, which is considered very high, so sun protection is advised.

• Tonight:
  Clear skies will dominate early on, with increasing cloudiness late this evening. Expect a low of 12°C overnight.

• Tuesday, July 22:
  A mix of sun and cloud with a daytime high of 22°C and humidex of 27. A very high UV index of 9 remains in effect. Cloud cover will thicken later in the day, bringing a 60% chance of showers overnight with a low of 17°C.

• Wednesday, July 23:
  Mostly cloudy with a 40% chance of showers. Daytime high of 23°C. The chance of showers will linger into the night with a low of 15°C.

• Thursday, July 24:
  A mix of sun and cloud continues, with a 30% chance of showers. The high will reach 24°C. Overnight, cloudy periods and scattered showers are expected with a low of 13°C.

Wardrobe Recommendations

• Daytime: Light layers are ideal, with breathable clothing to stay comfortable under the sun. Don’t forget UV protection—sunglasses, sunscreen, and a wide-brimmed hat are essential today.

• Evening: A light jacket or sweater will be handy as temperatures dip into the low teens.

Weather Trivia

Did You Know?
Thunder Bay’s July temperatures typically range between 12°C at night and 24°C by day, making it one of the most temperate and pleasant summer destinations in Northwestern Ontario. However, the area is also known for its frequent morning fogs, especially when cool air interacts with moist ground after overnight lows.

Thunder Bay Bimaadiziwin – Waawaashkeshi-bizaanag 21 Juillet 2025

Izhichigeyaang (Today’s Weather)

Mii maanda Ishkodek Assad

• Maagewin: 7:00 AM EDT – 10.1°C, wiiding gweteg (shallow fog), ishkode-wenisidoon, ji-giizhigoong akiing idi‑bimaadiziiwi, 97% zhiiwaa‑kaagewin, 102.0 kPa (zhitwaa), niizhwaaswi‑pi‑wii‑zhaawanoong (visibility 32 km),azhidaan akiing

• Niibinoqing: 23°C, humidex 26, ani‑aandi iwidi dagoshin (UV index) 8 – gigo‑ozhibii’amaadiwin – baabiish igo anokii‑waawaashkeshi naasaab‑mawsii’idiwin.

Gikinoo’amaadii Bimaadiziwin (Daily Forecast)

Maanpi (Monday, Jul 21)

• Niibinoqing: Bimaadiziwin zhimaandwaabaagan, niibishohan: 23°C, humidex 26, IWIDI dagoshin 8.

• Giizhikan: Zhimaandwaabaagan akiing, wiichii’idoon naagaj gaa‑jitoon: 12°C

Niizhwaaswi (Tuesday, Jul 22)

• Akiing-bimaadiziwin miinawaa gii­we?iwaang (sun+cloud mix), niibishohan: 22°C, humidex 27, IWIDI 9.

• Ganawendamaanod: Zia’aang agindaaso-zhimaandwaabaagan (night raining), mihkizhnagad 60%, wiind izhnag izhinikaaj (low) 17°C

Nswi (Wednesday, Jul 23)

• Zhimaandwaabaagan miinawaa gii­noozh (cloudy), mishinoonishin 40% zhaawanoong. Niibishohan: 23°C

• Ganawendamaanod: Zhimaandwaabaagan, mishinoonishin 30%, ozhaawanoong 15°C

Niiwin (Thursday, Jul 24)

• Bimaadiziwin miinawaa gawii?iwaang, mishinoonishin 30%. Niibishohan: 24°C

• Ganawendamaanod: Zhimaandwaabaagan miinawaa gawii?iwaang, mishinoonishin 30%. Ozhaawanoong: 13°C

Akiing Aki­izhichige (Wardrobe Advice)

• Maanda Ishkodek Assad: Giizhokamoon paikod, igodoodemag, misko­kwewandam awiiya ankiigiizhigad. Kiwii naanasheg dagoshin (UV) giizhikan, maanda pägizha?

• Ganawendamaanod: Giizhigamik inoniin zhaawan.

Mookomaan – Zanagishin

Thunder Bay ishkodek bmaadiziwin iyeiwaawaan igo July miinawaa nimkiikai’ig mashkikinoo’aniji’aadizid fog baabiish igo niizhwaaswi.