Thunder Bay weather in July
In July, Thunder Bay sees average daytime highs of 22°C and overnight lows near 14°C, with 76 mm of rain across 10.6 wet days and about 15.5 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.
Highs climb over the month, from about 21°C in the first days to 23°C by the end. The sky is clear or mostly clear about 28% of the time in July, and the air most often feels dry.
Daylight stretches from about 15 h 48 min at the start of July to 14 h 54 min by month's end. Set against the rest of the year, July is Thunder Bay's 2nd-clearest and 10th-windiest month. For the whole year in context, see Thunder Bay's year-round climate.
- Daytime high
- 22°
- 1st warmest
- Overnight low
- 14°
- 12th coldest
- Rainfall
- 76 mm
- 10.6 wet days
- Daylight
- 15 h 30 min
- 5:17 AM – 8:48 PM
- Cloud cover
- 59%
- 2nd clearest
- Wind
- 11 km/h
- 10th windiest
- Solar energy
- 5.93 kWh/m²
- Travel score
- 6.6
- out of 10
Thunder Bay is city in Thunder Bay District, Ontario, Canada.
- Air quality
- Excellent
- PM2.5 5 µg/m³ · 2019
- Density
- 243/km²
- people per km²
- Founded
- 1683
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Highs climb over the month, from about 21°C in the first days to 23°C by the end.
A typical July day in Thunder Bay reaches about 22°C in the afternoon and slips back to 14°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 27°C. Set against its neighbours, July runs about 4°C warmer than June and on par with August.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg low (°C) | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 21 | 13 |
| 2 | 21 | 13 |
| 3 | 21 | 13 |
| 4 | 21 | 13 |
| 5 | 22 | 13 |
| 6 | 22 | 13 |
| 7 | 22 | 13 |
| 8 | 22 | 13 |
| 9 | 22 | 14 |
| 10 | 22 | 14 |
| 11 | 22 | 14 |
| 12 | 22 | 14 |
| 13 | 22 | 14 |
| 14 | 22 | 14 |
| 15 | 22 | 14 |
| 16 | 23 | 14 |
| 17 | 23 | 14 |
| 18 | 23 | 14 |
| 19 | 23 | 14 |
| 20 | 23 | 14 |
| 21 | 23 | 14 |
| 22 | 23 | 14 |
| 23 | 23 | 14 |
| 24 | 23 | 14 |
| 25 | 23 | 14 |
| 26 | 23 | 14 |
| 27 | 23 | 14 |
| 28 | 23 | 14 |
| 29 | 23 | 14 |
| 30 | 23 | 14 |
| 31 | 23 | 14 |
How July really feels in Thunder Bay
Once humidity and wind are folded in, July averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Thunder Bay weather by month
How July compares with the rest of the year at a glance. July is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -10° / -18° | 29 | 6.5 | 7.5 | 8.6 | 0.0 |
| Feb | -7° / -16° | 22 | 4.9 | 5.4 | 9.9 | 0.0 |
| Mar | -1° / -10° | 31 | 6.8 | 5.6 | 11.6 | 0.0 |
| Apr | 6° / -3° | 54 | 8.3 | 5 | 13.4 | 0.7 |
| May | 13° / 4° | 66 | 10.1 | 0.8 | 15 | 3.5 |
| Jun | 19° / 10° | 65 | 10.5 | 0 | 15.8 | 5.8 |
| Jul | 22° / 14° | 76 | 10.6 | 0 | 15.5 | 6.6 |
| Aug | 22° / 13° | 67 | 9.1 | 0 | 14.1 | 6.7 |
| Sep | 17° / 9° | 84 | 10.5 | 0 | 12.4 | 5.2 |
| Oct | 9° / 3° | 72 | 10.4 | 1.3 | 10.6 | 1.7 |
| Nov | 1° / -5° | 49 | 7.8 | 5.7 | 9 | 0.0 |
| Dec | -6° / -13° | 38 | 7.3 | 7.8 | 8.2 | 0.0 |
Cloud cover in July
The sky is clear or mostly clear about 28% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 23% of July, with mostly cloudy or overcast conditions the remaining 49%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 46 | 46 | 46 | 46 | 47 | 48 | 48 | 48 | 49 | 49 | 50 | 50 | 51 | 51 | 52 | 53 | 52 | 53 | 53 | 53 | 53 | 54 | 54 | 53 | 54 | 54 | 54 | 54 | 55 | 56 | 56 |
| Cloudier (%) | 54 | 54 | 54 | 54 | 53 | 52 | 52 | 52 | 51 | 51 | 50 | 50 | 49 | 49 | 48 | 47 | 48 | 47 | 47 | 47 | 47 | 46 | 46 | 47 | 46 | 46 | 46 | 46 | 45 | 44 | 44 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 46 | 54 |
| 2 | 46 | 54 |
| 3 | 46 | 54 |
| 4 | 46 | 54 |
| 5 | 47 | 53 |
| 6 | 48 | 52 |
| 7 | 48 | 52 |
| 8 | 48 | 52 |
| 9 | 49 | 51 |
| 10 | 49 | 51 |
| 11 | 50 | 50 |
| 12 | 50 | 50 |
| 13 | 51 | 49 |
| 14 | 51 | 49 |
| 15 | 52 | 48 |
| 16 | 53 | 47 |
| 17 | 52 | 48 |
| 18 | 53 | 47 |
| 19 | 53 | 47 |
| 20 | 53 | 47 |
| 21 | 53 | 47 |
| 22 | 54 | 46 |
| 23 | 54 | 46 |
| 24 | 53 | 47 |
| 25 | 54 | 46 |
| 26 | 54 | 46 |
| 27 | 54 | 46 |
| 28 | 54 | 46 |
| 29 | 55 | 45 |
| 30 | 56 | 44 |
| 31 | 56 | 44 |
Chance of precipitation in July
Thunder Bay gets around 76 mm of rain over 10.6 wet days in July. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 34% and peaks near 36% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 35 | 35 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 35 | 35 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 31 | 31 | 31 |
| Rain chance (%) | |
|---|---|
| 1 | 35 |
| 2 | 35 |
| 3 | 35 |
| 4 | 36 |
| 5 | 36 |
| 6 | 36 |
| 7 | 36 |
| 8 | 36 |
| 9 | 36 |
| 10 | 36 |
| 11 | 36 |
| 12 | 36 |
| 13 | 36 |
| 14 | 35 |
| 15 | 35 |
| 16 | 34 |
| 17 | 34 |
| 18 | 34 |
| 19 | 34 |
| 20 | 33 |
| 21 | 33 |
| 22 | 33 |
| 23 | 33 |
| 24 | 33 |
| 25 | 32 |
| 26 | 32 |
| 27 | 32 |
| 28 | 31 |
| 29 | 31 |
| 30 | 31 |
| 31 | 31 |
Humidity in July
Most of July feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the dry band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 53 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 42 | 41 | 40 | 39 | 38 | 38 | 37 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 37 | 38 | 38 | 39 | 39 |
| Comfortable (%) | 31 | 32 | 32 | 32 | 33 | 33 | 33 | 34 | 34 | 35 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 | 36 | 36 | 35 | 35 | 34 | 34 | 33 | 33 |
| Humid (%) | 15 | 15 | 16 | 16 | 16 | 17 | 17 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 |
| Muggy (%) | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 53 | 31 | 15 | 1 | 0 |
| 2 | 51 | 32 | 15 | 2 | 0 |
| 3 | 50 | 32 | 16 | 2 | 0 |
| 4 | 49 | 32 | 16 | 2 | 0 |
| 5 | 48 | 33 | 16 | 2 | 0 |
| 6 | 47 | 33 | 17 | 3 | 0 |
| 7 | 46 | 33 | 17 | 3 | 0 |
| 8 | 45 | 34 | 18 | 4 | 0 |
| 9 | 44 | 34 | 18 | 4 | 0 |
| 10 | 42 | 35 | 18 | 5 | 0 |
| 11 | 41 | 35 | 18 | 5 | 0 |
| 12 | 40 | 36 | 19 | 5 | 0 |
| 13 | 39 | 36 | 19 | 6 | 0 |
| 14 | 38 | 36 | 19 | 6 | 0 |
| 15 | 38 | 36 | 19 | 6 | 0 |
| 16 | 37 | 36 | 19 | 7 | 1 |
| 17 | 36 | 36 | 20 | 7 | 1 |
| 18 | 36 | 37 | 20 | 7 | 1 |
| 19 | 35 | 37 | 20 | 7 | 1 |
| 20 | 35 | 37 | 21 | 7 | 1 |
| 21 | 35 | 37 | 21 | 7 | 1 |
| 22 | 35 | 37 | 21 | 7 | 1 |
| 23 | 35 | 37 | 21 | 7 | 1 |
| 24 | 35 | 36 | 21 | 7 | 1 |
| 25 | 36 | 36 | 21 | 6 | 0 |
| 26 | 36 | 35 | 22 | 6 | 0 |
| 27 | 37 | 35 | 22 | 6 | 0 |
| 28 | 38 | 34 | 22 | 6 | 0 |
| 29 | 38 | 34 | 22 | 6 | 0 |
| 30 | 39 | 33 | 22 | 6 | 0 |
| 31 | 39 | 33 | 22 | 6 | 0 |
Wind in July
Winds average 11 km/h in July.
Across July, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 11 | calm |
| 2 | 11 | calm |
| 3 | 11 | calm |
| 4 | 11 | calm |
| 5 | 11 | calm |
| 6 | 11 | calm |
| 7 | 11 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 11 | calm |
| 16 | 11 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
| 31 | 11 | calm |
Sunrise & sunset in July
Daylight runs from about 15 h 48 min at the start of July to 14 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 54 minutes over July. Sunrise moves from 5:05 AM to 5:35 AM, and sunset from 8:56 PM to 8:31 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 15.8 | 15.8 | 15.8 | 15.8 | 15.8 | 15.8 | 15.7 | 15.7 | 15.7 | 15.7 | 15.7 | 15.6 | 15.6 | 15.6 | 15.5 | 15.5 | 15.5 | 15.5 | 15.4 | 15.4 | 15.4 | 15.3 | 15.3 | 15.2 | 15.2 | 15.2 | 15.1 | 15.1 | 15.0 | 15.0 | 14.9 |
| Sunrise (AM) | 5:05 | 5:06 | 5:06 | 5:07 | 5:08 | 5:08 | 5:09 | 5:10 | 5:11 | 5:11 | 5:12 | 5:13 | 5:14 | 5:15 | 5:16 | 5:17 | 5:18 | 5:19 | 5:20 | 5:21 | 5:22 | 5:24 | 5:25 | 5:26 | 5:27 | 5:28 | 5:30 | 5:31 | 5:32 | 5:33 | 5:35 |
| Sunset (PM) | 8:56 | 8:55 | 8:55 | 8:55 | 8:55 | 8:54 | 8:54 | 8:53 | 8:53 | 8:52 | 8:52 | 8:51 | 8:50 | 8:50 | 8:49 | 8:48 | 8:47 | 8:46 | 8:46 | 8:45 | 8:44 | 8:43 | 8:41 | 8:40 | 8:39 | 8:38 | 8:37 | 8:35 | 8:34 | 8:33 | 8:31 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 15.8 | 5:05 | 8:56 |
| 2 | 15.8 | 5:06 | 8:55 |
| 3 | 15.8 | 5:06 | 8:55 |
| 4 | 15.8 | 5:07 | 8:55 |
| 5 | 15.8 | 5:08 | 8:55 |
| 6 | 15.8 | 5:08 | 8:54 |
| 7 | 15.7 | 5:09 | 8:54 |
| 8 | 15.7 | 5:10 | 8:53 |
| 9 | 15.7 | 5:11 | 8:53 |
| 10 | 15.7 | 5:11 | 8:52 |
| 11 | 15.7 | 5:12 | 8:52 |
| 12 | 15.6 | 5:13 | 8:51 |
| 13 | 15.6 | 5:14 | 8:50 |
| 14 | 15.6 | 5:15 | 8:50 |
| 15 | 15.5 | 5:16 | 8:49 |
| 16 | 15.5 | 5:17 | 8:48 |
| 17 | 15.5 | 5:18 | 8:47 |
| 18 | 15.5 | 5:19 | 8:46 |
| 19 | 15.4 | 5:20 | 8:46 |
| 20 | 15.4 | 5:21 | 8:45 |
| 21 | 15.4 | 5:22 | 8:44 |
| 22 | 15.3 | 5:24 | 8:43 |
| 23 | 15.3 | 5:25 | 8:41 |
| 24 | 15.2 | 5:26 | 8:40 |
| 25 | 15.2 | 5:27 | 8:39 |
| 26 | 15.2 | 5:28 | 8:38 |
| 27 | 15.1 | 5:30 | 8:37 |
| 28 | 15.1 | 5:31 | 8:35 |
| 29 | 15.0 | 5:32 | 8:34 |
| 30 | 15.0 | 5:33 | 8:33 |
| 31 | 14.9 | 5:35 | 8:31 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 5.93 kWh/m².
For context, solar energy here swings from a low near 1.12 kWh/m² to a high of 6.21 kWh/m² in June across the year — July's 5.93 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.1 | 6.1 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.8 | 5.8 | 5.8 | 5.8 | 5.7 | 5.7 | 5.7 | 5.7 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.1 | Intense |
| 2 | 6.1 | Intense |
| 3 | 6.0 | Intense |
| 4 | 6.0 | Intense |
| 5 | 6.0 | Intense |
| 6 | 6.0 | Intense |
| 7 | 6.0 | Intense |
| 8 | 6.0 | Intense |
| 9 | 6.0 | Bright |
| 10 | 6.0 | Bright |
| 11 | 6.0 | Bright |
| 12 | 6.0 | Bright |
| 13 | 6.0 | Bright |
| 14 | 6.0 | Bright |
| 15 | 6.0 | Bright |
| 16 | 6.0 | Bright |
| 17 | 6.0 | Bright |
| 18 | 5.9 | Bright |
| 19 | 5.9 | Bright |
| 20 | 5.9 | Bright |
| 21 | 5.9 | Bright |
| 22 | 5.9 | Bright |
| 23 | 5.9 | Bright |
| 24 | 5.8 | Bright |
| 25 | 5.8 | Bright |
| 26 | 5.8 | Bright |
| 27 | 5.8 | Bright |
| 28 | 5.7 | Bright |
| 29 | 5.7 | Bright |
| 30 | 5.7 | Bright |
| 31 | 5.7 | Bright |
Is July a good time to visit Thunder Bay?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is a reasonable time to visit Thunder Bay for sightseeing.
What to pack for Thunder Bay in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Thunder Bay sees daytime highs around 22°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.
Sea temperature near Thunder Bay in July
The nearest coast averages about 9°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 15°C and coldest in March near 1°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 2 | 1 | 1 | 2 | 3 | 4 | 9 | 15 | 14 | 10 | 6 | 4 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 2 | Bracing |
| Feb | 1 | Bracing |
| Mar | 1 | Bracing |
| Apr | 2 | Bracing |
| May | 3 | Bracing |
| Jun | 4 | Bracing |
| Jul | 9 | Bracing |
| Aug | 15 | Cool |
| Sep | 14 | Bracing |
| Oct | 10 | Bracing |
| Nov | 6 | Bracing |
| Dec | 4 | Bracing |
UV index in Thunder Bay in July
Clear-sky midday UV in July peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Thunder Bay peaks around June 17 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 21 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 5 | 6 | 8 | 6 | 6 | 5 | 3 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | Very high | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | Moderate |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 6 | High |
| Aug | 6 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Thunder Bay?
Thunder Bay sits at 48.4°N, 89.3°W, 188 m above sea level, in Canada. The nearest listed city is Marquette, 247 km away.
Topography around Thunder Bay
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thunder Bay.
Within 3 km, the terrain around Thunder Bay has only modest variations in elevation — a maximum elevation change of 20 m around an average of 188 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 297 m; within 80 km, significant variations in elevation — a maximum elevation change of 503 m.
The land around Thunder Bay is covered by artificial surfaces (41%) and trees (26%) within 3 km, trees (43%) and water (39%) within 16 km, and trees (57%) and water (40%) within 80 km.
Canada travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 83% of US
- price level, 2025
- GDP per capita
- $55,698
- 2025
- Happiness
- 6.7 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 2
- per 100k, 2023
- Road deaths
- 5.3
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Thunder Bay (48.382°, -89.2502°, elevation 188 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).