Thunder Bay Weather in April
Average highs run from 4°C on April 1 to 12°C on April 30, and lows from -5°C to 0°C. Normal precipitation for the month is 51 mm over about 9 wet days.
April day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
April at a glance
- Average high
- 8°C
- Average low
- -3°C
- Precipitation
- 51 mm
- Reanalysis high
- 25°CApr 30, 1998
- Reanalysis low
- -17°CApr 4, 1995
- Daylight
- 12 h 53 min to 14 h 31 min
- Cloud cover
- 68%
- Humidity
- 72%
- Dew point
- -3°C
- Wind
- 10.8 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 |
|---|---|---|---|---|---|
| Apr 1 | 4°C | -5°C | 17°C 2010 | -11°C 2018 | 32% |
| Apr 2 | 4°C | -5°C | 15°C 2004 | -14°C 2014 | 31% |
| Apr 3 | 5°C | -5°C | 15°C 1991 | -15°C 1995 | 31% |
| Apr 4 | 5°C | -5°C | 16°C 1991 | -17°C 1995 | 30% |
| Apr 5 | 5°C | -4°C | 21°C 1991 | -15°C 2014 | 30% |
| Apr 6 | 5°C | -4°C | 15°C 1991 | -14°C 2007 | 30% |
| Apr 7 | 6°C | -4°C | 14°C 2005 | -12°C 1996 | 30% |
| Apr 8 | 6°C | -4°C | 14°C 2017 | -15°C 1996 | 30% |
| Apr 9 | 6°C | -4°C | 17°C 2017 | -14°C 2016 | 30% |
| Apr 10 | 7°C | -4°C | 17°C 2003 | -10°C 2000 | 30% |
| Apr 11 | 7°C | -3°C | 18°C 2006 | -7°C 1997 | 31% |
| Apr 12 | 7°C | -3°C | 16°C 2015 | -11°C 1992 | 32% |
| Apr 13 | 8°C | -3°C | 15°C 2017 | -8°C 1992 | 32% |
| Apr 14 | 8°C | -3°C | 19°C 2003 | -9°C 2018 | 32% |
| Apr 15 | 8°C | -2°C | 19°C 2017 | -10°C 2014 | 31% |
| Apr 16 | 8°C | -2°C | 18°C 2016 | -12°C 2014 | 30% |
| Apr 17 | 9°C | -2°C | 18°C 2009 | -9°C 2011 | 31% |
| Apr 18 | 9°C | -2°C | 20°C 1994 | -10°C 2011 | 31% |
| Apr 19 | 9°C | -2°C | 21°C 2005 | -9°C 2013 | 31% |
| Apr 20 | 9°C | -2°C | 17°C 2007 | -11°C 2013 | 32% |
| Apr 21 | 9°C | -2°C | 16°C 1998 | -8°C 2013 | 32% |
| Apr 22 | 10°C | -1°C | 20°C 2007 | -6°C 2015 | 32% |
| Apr 23 | 10°C | -1°C | 20°C 2010 | -5°C 2015 | 32% |
| Apr 24 | 10°C | -1°C | 15°C 2003 | -5°C 2013 | 34% |
| Apr 25 | 10°C | -1°C | 19°C 1999 | -4°C 2018 | 34% |
| Apr 26 | 10°C | -1°C | 20°C 2000 | -7°C 1996 | 32% |
| Apr 27 | 11°C | -1°C | 20°C 2007 | -8°C 1996 | 31% |
| Apr 28 | 11°C | 0°C | 20°C 1998 | -7°C 2017 | 33% |
| Apr 29 | 11°C | 0°C | 22°C 1998 | -4°C 2017 | 33% |
| Apr 30 | 12°C | 0°C | 25°C 1998 | -3°C 1997 | 34% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- April 1
- sunrise 7:35 AM, sunset 8:28 PM
- April 30
- sunrise 6:39 AM, sunset 9:10 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.