Thunder Bay – WEATHER – Here’s your Northwestern Ontario Regional Weather Roundup for Tuesday, August 19, 2025, including Thunder Bay, as well as Kenora, Lake of the Woods, Dryden, Vermilion Bay, Ogoki Post, Lansdowne House, Webequie, Cat Lake, Sandy Lake, and Attawapiskat:
Regional Forecast Highlights
Thunder Bay
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Now (7:00 AM EDT): Misty, 15.6 °C, 100% humidity, light NE winds, pressure falling. Visibility ~10 km.
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Today: Cloudy, 40% chance of showers/drizzle, high of 21 °C (humidex 26), UV index moderate (5).
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Tonight: Continued cloudiness; 40% shower chance, fog returning near midnight; low of 14 °C.
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Wed–Fri (Aug 20–22): Warming up with highs near 25 °C. Wednesday humid; Thursday and Friday bring mixed sun, clouds, and escalating evening showers.
Kenora & Lake of the Woods
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Detailed earlier: fog, drizzle early today; warming to 25 °C (humidex 30); midweek highs reaching 27 °C with humidex up to 32; more unsettled and cooler later in the week.
Dryden & Vermilion Bay
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Yesterday’s summary: Misty start, high of 23 °C (humidex 29); warming midweek to 27 °C (humidex 32); showers likely later and into the weekend.
Far Northern Communities
Insights from the NetNewsLedger Weather Desk Northern Ontario bulletin:
Ogoki Post / Lansdowne House
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Today: Mainly cloudy with a 30% chance of afternoon showers and a risk of thunderstorms; fog dissipating; high ~26 °C (humidex 31).
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Tonight: Continued clouds with a 30% shower chance and thunderstorms possible; low ~17 °C.
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Tuesday (Aug 20): Cloudy; 60% chance of afternoon showers; thunderstorm risk; high ~34 °C (humidex 39).
Webequie
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Today: Cloudy, turning mixed sun/cloud in afternoon, 40% shower chance, thunderstorm risk; high ~24 °C (humidex 30).
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Tonight: Mainly cloudy, 40% chance of showers early evening with thunderstorm risk; low ~20 °C.
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Tuesday: Increasing cloud, 60% chance of afternoon showers; thunder risk; high ~22 °C, falling to ~15 °C later; humidex ~27 °C.
Cat Lake (and Pickle Lake area)
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Today: Mainly cloudy, morning fog clearing; local afternoon smoke possible; high ~24 °C (humidex 27).
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Tonight: 40% chance of showers and thunderstorms developing afterward; low ~17 °C.
Attawapiskat
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Today: Cloudy, 40% chance of late afternoon showers with thunder risk; high ~24 °C (humidex 31).
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Tonight: Continued cloud cover, 40% chance of early evening showers, thunderstorms possible; low ~18 °C.
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Tuesday: Mainly sunny morning, then increasing cloudiness and 40% chance of late-afternoon showers with thunder risk; high ~27 °C (humidex 33).
Summary Table
| Region | Today Highlights | Tonight Forecast | Midweek Temperature Trend |
|---|---|---|---|
| Thunder Bay | Mist → cloudy, high ~21 °C (humidex 26) | Cloudy, 40% showers, fog returns (14 °C) | Warming to ~25 °C; humid, showers later |
| Kenora / Lake of the Woods | Fog/drizzle → high ~25 °C (humidex 30) | Clearing then fog; mid-teens overnight | Highs 27°C midweek; cooler with showers |
| Dryden / Vermilion Bay | Misty start; high ~23 °C (humidex 29) | Main clouds; fog returns (13 °C) | Midweek high ~27 °C; then cooler, unsettled |
| Ogoki Post / Lans. House | Cloudy, 30% PM showers or storms; high 26 °C | Still cloudy with storms; low 17 °C | Tuesday stifling heat: 34 °C (humidex 39) |
| Webequie | Cloudy → mix of sun/cloud, PM showers; 24 °C | Cloudy with showers/thunder; low 20 °C | Cooler Tuesday: 22 °C, falling to ~15 °C |
| Cat Lake | Cloudy with smoke; high 24 °C (humidex 27) | Showers/thunder likely; low 17 °C | — |
| Attawapiskat | Cloudy, 40% PM showers with thunder; high 24 °C | Cloudy with showers, storms possible; low 18 °C | Warms Tuesday to 27 °C (humidex 33) |
Wardrobe Suggestions
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Northwest (Thunder Bay, Kenora, Dryden): Layers and light waterproof gear recommended today. Midweek brings heat—opt for summer clothing and sun protection.
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Far North (Ogoki, Webequie, Cat Lake, Attawapiskat):
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Today & Tonight: Be prepared for showers and possible thunderstorms—bring waterproof gear and a change of clothes.
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Midweek: Ogoki Post might see extreme heat—dress light and stay hydrated. Other far-northern spots remain moderately warm with shower chances—carry a rain jacket and stay alert for storms.
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