Climate averages 1991–2020
Thunder Bay weather
in October.
A cool, moderately wet month: the 6th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a cool month in Thunder Bay: daytime highs average 9.9°C and nights cool to about 4.8°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 72 mm of rain on roughly 10 days, which makes October a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 52 min on an average October day.
The nearest other city in this atlas is Duluth (278 km away). In October its highs average 11.6°C, 1.7°C warmer than Thunder Bay, with 103 mm of rain.
Among the 86 cities listed in Canada, Thunder Bay ranks 76th of 86 for the warmest October highs and 13th of 86 for the driest October (rainfall, lowest first). The mean October high of those 86 cities is 12.7°C; Thunder Bay is 2.8°C cooler than that mean.
From October to November, average highs fall by 7.6°C to 2.3°C, and monthly rainfall falls from 72 mm to 49 mm.
The annual picture
October in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Thunder Bay climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -9.6°C-16.6°C | -16.6°C | 29 | 6.5 | 8.89 h |
| February | -8.0°C-15.0°C | -15.0°C | 22 | 4.9 | 10.210 h |
| March | -1.7°C-8.7°C | -8.7°C | 31 | 6.8 | 11.912 h |
| April | 5.1°C-2.2°C | -2.2°C | 54 | 8.3 | 13.614 h |
| May | 12.5°C4.2°C | 4.2°C | 66 | 10.1 | 15.215 h |
| June | 18.3°C10.7°C | 10.7°C | 65 | 10.5 | 16.016 h |
| July | 22.3°C15.3°C | 15.3°C | 76 | 10.6 | 15.716 h |
| August | 22.3°C15.6°C | 15.6°C | 67 | 9.1 | 14.314 h |
| September | 17.8°C11.7°C | 11.7°C | 84 | 10.5 | 12.613 h |
| October, selected | 9.9°C4.8°C | 4.8°C | 72 | 10.4 | 10.911 h |
| November | 2.3°C-2.8°C | -2.8°C | 49 | 7.8 | 9.39 h |
| December | -4.8°C-11.3°C | -11.3°C | 38 | 7.4 | 8.48 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
October in nearby cities
- Duluth in OctoberUnited States · 278 kmHigh 11.6°C · Low 6.6°C · 103 mm rain
- Sault Ste. Marie in OctoberCanada · 424 kmHigh 11.5°C · Low 5.5°C · 101 mm rain
- Green Bay in OctoberUnited States · 440 kmHigh 14.0°C · Low 6.6°C · 71 mm rain
- Appleton in OctoberUnited States · 463 kmHigh 13.7°C · Low 6.3°C · 72 mm rain
- Brooklyn Park in OctoberUnited States · 481 kmHigh 13.4°C · Low 5.9°C · 67 mm rain
- Saint Paul in OctoberUnited States · 482 kmHigh 13.7°C · Low 6.1°C · 68 mm rain
- Minneapolis in OctoberUnited States · 487 kmHigh 13.6°C · Low 6.0°C · 67 mm rain
- Plymouth, United States in OctoberUnited States · 493 kmHigh 13.4°C · Low 5.9°C · 66 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Thunder Bay) is explained once on the Thunder Bay year overview and on the Sources, method and limits page.