Thunder Bay weather in June

In June, Thunder Bay sees average daytime highs of 19°C and overnight lows near 10°C, with 65 mm of rain across 10.5 wet days and about 15.8 hours of daylight. It is the 3rd-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 21°C by the end. The sky is clear or mostly clear about 28% of the time in June, and the air most often feels dry.

Daylight stretches from about 15 h 36 min at the start of June to 15 h 54 min by month's end. Set against the rest of the year, June is Thunder Bay's 3rd-clearest and 12th-windiest month. For the whole year in context, see Thunder Bay's year-round climate.

Daytime high
19°
3rd warmest
Overnight low
10°
10th coldest
Rainfall
65 mm
10.5 wet days
Daylight
15 h 54 min
5:01 AM – 8:53 PM
Cloud cover
61%
3rd clearest
Wind
10 km/h
12th windiest
Solar energy
6.21 kWh/m²
Travel score
5.8
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 June

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 16°C in the first days to 21°C by the end.

A typical June day in Thunder Bay reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 23°C. Set against its neighbours, June runs about 6°C warmer than May and about 4°C cooler than July.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
1167
2167
3167
4178
5178
6178
7178
8178
9179
10189
11189
12189
13189
141810
151910
161910
171910
181911
191911
202011
212011
222011
232011
242012
252012
262012
272112
282112
292112
302113

How June really feels in Thunder Bay

Once humidity and wind are folded in, June 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.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

June 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 June compares with the rest of the year at a glance. June is the 3rd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-10° / -18°296.57.58.60.0
Feb-7° / -16°224.95.49.90.0
Mar-1° / -10°316.85.611.60.0
Apr / -3°548.3513.40.7
May13° / 6610.10.8153.5
Jun19° / 10°6510.5015.85.8
Jul22° / 14°7610.6015.56.6
Aug22° / 13°679.1014.16.7
Sep17° / 8410.5012.45.2
Oct / 7210.41.310.61.7
Nov / -5°497.85.790.0
Dec-6° / -13°387.37.88.20.0

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 18% of June, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34555
44654
54654
64654
74654
84654
94753
104753
114753
124654
134654
144654
154654
164654
174654
184654
194654
204555
214654
224555
234654
244555
254555
264654
274555
284555
294555
304654

Chance of precipitation in June

Any precipitation

Thunder Bay gets around 65 mm of rain over 10.5 wet days in June. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 35% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
234
335
435
535
635
735
835
935
1035
1135
1234
1334
1434
1534
1634
1734
1834
1934
2034
2134
2234
2334
2434
2535
2635
2735
2835
2935
3035

Humidity in June

DryComfortableHumidMuggyOppressiveMiserable

Most of June feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, June lands in the dry band about 78% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
197300
296400
396400
495500
595500
694600
793700
892800
990910
10891010
11871210
12851320
13841420
14821530
15801730
16781840
17761950
18742060
19722260
20702370
21682480
22662590
236525100
246226111
256126121
266027121
275828131
285629141
295629141
305430151

Wind in June

Winds average 10 km/h in June, the calmest month.

Across June, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in June

DaylightNight

Daylight runs from about 15 h 36 min at the start of June to 15 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over June. Sunrise moves from 5:07 AM to 5:04 AM, and sunset from 8:42 PM to 8:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
115.65:078:42
215.65:068:43
315.65:068:44
415.75:058:45
515.75:058:46
615.75:048:46
715.75:048:47
815.75:038:48
915.85:038:49
1015.85:028:50
1115.85:028:50
1215.85:028:51
1315.85:028:52
1415.85:028:52
1515.95:018:53
1615.95:018:53
1715.95:018:54
1815.95:018:54
1915.95:018:54
2015.95:018:55
2115.95:018:55
2215.95:028:55
2315.95:028:56
2415.95:028:56
2515.95:028:56
2615.95:038:56
2715.95:038:56
2815.95:048:56
2915.95:048:56
3015.95:048:56

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 6.21 kWh/m² — the sunniest month for solar.

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 — June's 6.21 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
Planning a trip in June

Is June a good time to visit Thunder Bay?

Our two travel scores rate June for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.8
Sightseeing
3rd-best month of the year
2.3
Beach & pool
3rd-best month of the year

June is a reasonable time to visit Thunder Bay for sightseeing.

What to pack for Thunder Bay in June

From June's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In June, Thunder Bay sees daytime highs around 19°C and nights near 10°C. Pack sun protection. Worth having: rain gear. About 11 days see rain.

sun protectionrain gear

Sea temperature near Thunder Bay in June

The nearest coast averages about 4°C in June — 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.

0°5°10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May3Bracing
Jun4Bracing
Jul9Bracing
Aug15Cool
Sep14Bracing
Oct10Bracing
Nov6Bracing
Dec4Bracing

UV index in Thunder Bay in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June peaks around 8 — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 17UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun8Very high
Jul6High
Aug6High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

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.

WausauWestonKenoraMarshfield

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.

3 km
20 m
16 km
297 m
80 km
503 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
June weather nearby: Marquette 247 km · Duluth 278 km · Superior 283 km · Hibbing 295 km · Wausau 382 km · Weston 389 km · Kenora 411 km · Marshfield 419 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
Christian 53%none 35%Muslim 5%Hindu 2%

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).