THUNDER BAY — NORTHWESTERN ONTARIO– Tuesday morning is starting cool and humid across much of the region, with temperatures ranging from about 10°C in Red Lake and Sioux Lookout to 16°C in Kenora.
The overall weather pattern through August 14 will feature some afternoon shower and summer storm chances Tuesday and Wednesday, followed by a notably brighter and drier Thursday. Clouds return to several communities Friday. Environment Canada forecasts published early Tuesday morning call for daytime highs mostly in the low to mid-20s, while overnight temperatures dip into the single digits in a few locations Thursday night.
Around 6:00 a.m. Tuesday, conditions were generally quiet across Northwestern Ontario. Kenora was partly cloudy at 15.7°C with a north-northwest wind at 9 km/h. Dryden was mainly sunny at 12.7°C, while Sioux Lookout and Red Lake were both just under 10°C with calm winds.
Vermilion Bay and Dryden:Wednesday will be mainly cloudy with a 40 per cent chance of afternoon showers and a summer storm risk, reaching21°Cand falling to11°Covernight.
Pickle Lake was sunnier and a little warmer at 12.9°C, with a west-northwest wind at 11 km/h. Kenora will see sunshine giving way to a mix of sun and cloud Tuesday, with a30 per cent chance of afternoon showers. The high will reach24°C, with a humidex of 26 and a high UV index of 6. Tonight becomes mainly cloudy with a 30 per cent chance of showers before clearing toward morning, with a low of13°C. Vermilion Bay and Dryden share a very similar forecast. Sunshine dominates the morning and early afternoon before clouds uptick, bringing a30 per cent chance of afternoon showers. Expect a high of23°C, humidex 25 and a high UV index of 6. Tonight will be mainly cloudy with a 30 per cent shower chance and a low near12°C. Fort Frances will see a mix of sun and cloud with a30 per cent chance of late-afternoon showers and a risk of a summer storm. The high will reach24°C, feeling closer to 27 with the humidex. The UV index is 7, or high. The summer storm risk continues into early evening before temperatures fall to12°Covernight. A mix of sun and cloud is expected in Sioux Lookout, along with a30 per cent chance of afternoon showers. The daytime high is22°C, with a high UV index of 6. Tonight becomes mainly cloudy with a 30 per cent chance of showers and a low of12°C. Pickle Lake has one of the more unsettled forecasts Tuesday. Mainly sunny conditions will give way to increasing cloud, followed by a40 per cent chance of afternoon showers and a risk of a storm. Westerly winds will boost to30 km/hlate this morning. The high will be22°C. Tonight brings a 30 per cent chance of showers, an evening storm risk and developing fog patches, with a low of12°C. Red Lake starts sunny before cloud increases near noon. There is a30 per cent chance of afternoon showers, with a high of21°C. Cloudy skies and a continued 30 per cent shower chance follow tonight, with a low of12°C. Kenora:Wednesday brings a mix of sun and cloud with a 40 per cent chance of afternoon showers and a storm risk, reaching22°Cbefore a clear night at12°C. Thursday looks excellent for outdoor plans: sunny with a high of24°Cand low of 12°C. Friday turns cloudy but remains mild at23°C, with an overnight low near 13°C. Vermilion Bay and Dryden:Wednesday will be mainly cloudy with a 40 per cent chance of afternoon showers and a summer storm risk, reaching21°Cand falling to11°Covernight. Thursday will be sunny with a high of22°C, followed by a chilly clear night near9°C. Clouds surge Friday, with a high of22°Cand low of 10°C. Fort Frances:Wednesday reaches23°Cwith a 30 per cent chance of afternoon showers and thunderstorms. Northwest winds surge to20 km/hlate in the morning. Skies clear Wednesday night with a low of 11°C. Thursday is the warm spot of this forecast period, sunny and25°C, before temperatures decrease sharply to9°Covernight. Friday will be cloudy and cooler, with a high of21°C. Sioux Lookout:Wednesday will be mainly cloudy with a 40 per cent chance of afternoon showers and a risk of a storm. Northwest winds growth to20 km/hlate in the afternoon, with a high of20°C. Thursday turns sunny with a high of21°Cand a clear overnight low of 10°C. Friday brings a mix of sun and cloud and a high of22°C. Pickle Lake:Mainly cloudy skies Wednesday carry a 30 per cent chance of showers and an afternoon storm risk. North winds expansion to20 km/hduring the afternoon, with a high of21°C. Thursday brings a mix of sun and cloud at 21°C. Friday warms to24°Cunder another mix of sun and cloud, with an overnight low of 13°C. Red Lake:Wednesday will feature a mix of sun and cloud with a 40 per cent chance of afternoon showers and a storm risk. Northwest winds become20 km/hlate in the morning. The high is21°C, followed by a clear night near 11°C. Thursday will be sunny and22°C. Friday becomes cloudy but warmer, reaching24°C. The main period to keep an eye on will beTuesday afternoon through Wednesday afternoon, when scattered showers and isolated thunderstorms are possible across much of Northwestern Ontario. Thursday offers the most consistently favourable outdoor weather, with sunshine forecast in Kenora, Dryden, Vermilion Bay, Fort Frances, Sioux Lookout and Red Lake, while Pickle Lake sees a mix of sun and cloud. Friday marks another transition toward more cloud, particularly in Kenora, Fort Frances and Red Lake, although temperatures remain seasonable in the low to mid-20s. A light jacket or sweater will be useful for early mornings and evenings, particularly Thursday night when temperatures could dip to9°C in Dryden, Vermilion Bay and Fort Frances. Daytime conditions remain comfortable enough for shorts and short sleeves, but keep a lightweight rain jacket or compact umbrella handy Tuesday and Wednesday. With UV values reaching the high category in several communities, sunglasses, sunscreen and a hat remain worthwhile even when periods of cloud are expected. Anyone heading onto the lakes, travelling remote highways or working outdoors should keep an eye on changing conditions Tuesday and Wednesday because thunderstorms can cause rapid changes in visibility and wind. Mid-August temperatures in this forecast are remarkably close to normal in some communities. Environment Canada’s daily normal for Kenora at this point in August is about24°C for the daytime high and 14°C overnight. Sioux Lookout’s normal is approximately23°C by day and 13°C at night. That makes this week’s low-to-mid-20s daytime temperatures very typical for the season, even though some overnight lows will run cooler. Forecast information is based on Environment and Climate Change Canada observations and forecasts available Tuesday morning, August 11, 2026. Forecasts and weather alerts can change, so travellers and outdoor users should check the newest Environment Canada information before departure..
Community members are encouraged to stay informed and share this information with friends and family. Following trusted local news sources helps ensure everyone stays up to date with events and announcements affecting Thunder Bay and Northwestern Ontario.
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📍 Source: NetNewsLedger · By: NetNewsLedger Staff · 🗓️ August 11, 2026 · 🏠 ThunderBay.Online
