🇨🇦 Weather in Thunder Bay
Map Overlays:
Hourly Forecast for Thunder Bay
18:00
22°
1%
19:00
22°
1%
20:00
20°
1%
21:00
17°
2%
22:00
16°
3%
23:00
14°
4%
00:00
13°
4%
01:00
12°
5%
02:00
12°
6%
03:00
11°
8%
04:00
11°
10%
05:00
10°
11%
06:00
10°
12%
07:00
12°
8%
08:00
12°
8%
09:00
13°
6%
10:00
14°
5%
11:00
16°
14%
12:00
17°
14%
13:00
18°
12%
14:00
18°
13%
15:00
18°
13%
16:00
18°
13%
17:00
18°
14%
14-Day Forecast for Thunder Bay
2026-08-23
Sunny
22° /
9°
2026-08-24
Overcast
18° /
10°
2026-08-25
Overcast
17° /
14°
2026-08-26
Patchy rain nearby
20° /
15°
2026-08-27
Sunny
18° /
13°
2026-08-28
Sunny
15° /
8°
2026-08-29
Sunny
18° /
11°
Additional Forecasts for Thunder Bay
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 104.0 μg/m³
O₃ (Ozone) 68.0 μg/m³
NO₂ (Nitrogen Dioxide) 0.4 μg/m³
SO₂ (Sulphur Dioxide) 0.4 μg/m³
PM2.5 (Fine particles) 2.7 μg/m³
PM10 (Coarse particles) 2.8 μg/m³
Historical Weather
Weather Forecasts for Other Cities in Canada
Weather in Thunder Bay — FAQ
Answers refreshed each request based on current conditions in Thunder Bay.
What is the weather like right now in Thunder Bay?
Right now in Thunder Bay, Canada the temperature is 21.5°C (feels like 18.9°C), with partly cloudy. Relative humidity is 43% and wind is 11.2 km/h.
What is today's high and low temperature in Thunder Bay?
Today's forecast high in Thunder Bay is 22.3°C and the overnight low is 9.0°C. The diurnal range — high minus low — depends on cloud cover; clear days swing more than overcast ones.
Will it rain in Thunder Bay today?
The chance of precipitation in Thunder Bay today is 4%. Forecast accuracy is highest within the next 6 hours and decreases steadily out to 14 days.
How often does the weather here update?
Current observations refresh every 15-60 minutes from the nearest monitoring stations operated by national meteorological agencies. The hourly forecast updates approximately every hour; the 7- and 14-day outlook is recomputed several times per day.
What does 'feels like' temperature mean?
Feels-like (apparent) temperature accounts for humidity, wind chill and direct sunshine — variables that change how the human body perceives heat or cold. On hot, humid days it can be 3-7°C above the actual reading; on cold windy days it can be 5-15°C below.
Why does the temperature in Thunder Bay differ from nearby cities?
Even short distances can change temperatures noticeably. Thunder Bay's reading reflects altitude, proximity to large bodies of water, urban heat island effects, and the exact location of the monitoring stations supplying the data. Coastal cities are typically milder and more humid than inland equivalents.