Thunder Bay Weather in August
Average highs run from 24°C on August 1 to 22°C on August 31, and lows from 13°C to 11°C. Normal precipitation for the month is 59 mm over about 12 wet days.
August day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
August at a glance
- Average high
- 23°C
- Average low
- 12°C
- Precipitation
- 59 mm
- Reanalysis high
- 32°CAug 8, 2005
- Reanalysis low
- 5°CAug 20, 2004
- Daylight
- 15 h 02 min to 13 h 27 min
- Cloud cover
- 64%
- Humidity
- 74%
- Dew point
- 12°C
- Wind
- 8.3 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 24°C | 13°C | 31°C 2011 | 9°C 2018 | 39% |
| Aug 2 | 24°C | 13°C | 30°C 2005 | 7°C 2018 | 39% |
| Aug 3 | 24°C | 13°C | 29°C 2010 | 9°C 1993 | 38% |
| Aug 4 | 24°C | 13°C | 30°C 2001 | 8°C 1993 | 36% |
| Aug 5 | 24°C | 13°C | 30°C 2001 | 9°C 1994 | 35% |
| Aug 6 | 24°C | 13°C | 31°C 2001 | 9°C 1994 | 35% |
| Aug 7 | 24°C | 13°C | 31°C 2001 | 9°C 1994 | 34% |
| Aug 8 | 24°C | 13°C | 32°C 2005 | 8°C 1994 | 33% |
| Aug 9 | 24°C | 13°C | 31°C 2010 | 6°C 1994 | 32% |
| Aug 10 | 24°C | 13°C | 32°C 2007 | 5°C 2004 | 32% |
| Aug 11 | 24°C | 13°C | 31°C 2018 | 7°C 1997 | 32% |
| Aug 12 | 24°C | 12°C | 31°C 2018 | 6°C 1992 | 33% |
| Aug 13 | 23°C | 12°C | 32°C 1991 | 8°C 1997 | 34% |
| Aug 14 | 23°C | 12°C | 32°C 1991 | 6°C 2014 | 35% |
| Aug 15 | 23°C | 12°C | 31°C 2015 | 9°C 1994 | 35% |
| Aug 16 | 23°C | 12°C | 30°C 2018 | 9°C 2000 | 35% |
| Aug 17 | 23°C | 12°C | 28°C 1996 | 8°C 2012 | 34% |
| Aug 18 | 23°C | 12°C | 30°C 2003 | 7°C 2007 | 35% |
| Aug 19 | 23°C | 12°C | 29°C 2013 | 6°C 2004 | 36% |
| Aug 20 | 23°C | 12°C | 30°C 2013 | 5°C 2004 | 36% |
| Aug 21 | 23°C | 12°C | 28°C 2013 | 6°C 2004 | 38% |
| Aug 22 | 23°C | 12°C | 28°C 2012 | 8°C 2005 | 39% |
| Aug 23 | 23°C | 12°C | 28°C 2011 | 7°C 2009 | 40% |
| Aug 24 | 23°C | 12°C | 28°C 1993 | 6°C 2017 | 39% |
| Aug 25 | 23°C | 12°C | 31°C 2013 | 7°C 2017 | 39% |
| Aug 26 | 22°C | 12°C | 31°C 2013 | 7°C 1992 | 40% |
| Aug 27 | 22°C | 12°C | 31°C 1991 | 6°C 1992 | 40% |
| Aug 28 | 22°C | 12°C | 31°C 1991 | 6°C 1992 | 39% |
| Aug 29 | 22°C | 11°C | 31°C 1991 | 7°C 2009 | 39% |
| Aug 30 | 22°C | 11°C | 31°C 2012 | 6°C 2009 | 39% |
| Aug 31 | 22°C | 11°C | 29°C 2010 | 6°C 1994 | 40% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 6:32 AM, sunset 9:34 PM
- August 31
- sunrise 7:13 AM, sunset 8:40 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.