Sarnia weather in June

In June, Sarnia sees average daytime highs of 24°C and overnight lows near 16°C, with 87 mm of rain across 10.8 wet days and about 15.1 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 22°C in the first days to 25°C by the end. The sky is clear or mostly clear about 31% of the time in June, and the air most often feels dry.

Daylight stretches from about 14 h 54 min at the start of June to 15 h 06 min by month's end. Set against the rest of the year, June is Sarnia's 4th-clearest and 10th-windiest month. For the whole year in context, see Sarnia's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
87 mm
10.8 wet days
Daylight
15 h 12 min
4:55 AM – 8:04 PM
Cloud cover
57%
4th clearest
Wind
12 km/h
10th windiest
Solar energy
6.37 kWh/m²
Travel score
6.7
out of 10

Sarnia is city in Ontario, Canada.

Air quality
Good
PM2.5 7 µg/m³ · 2019
Density
440/km²
people per km²
Founded
1830

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 22°C in the first days to 25°C by the end.

A typical June day in Sarnia reaches about 24°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 29°C. Set against its neighbours, June runs about 6°C warmer than May and about 2°C cooler than July.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12113
22113
32213
42214
52214
62214
72214
82314
92315
102315
112315
122315
132315
142416
152416
162416
172416
182416
192416
202417
212517
222517
232517
242517
252517
262517
272517
282517
292518
302618

How June really feels in Sarnia

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.

Sarnia weather by month

How June compares with the rest of the year at a glance. June is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -7°579.67.39.20.0
Feb / -7°518.46.310.20.0
Mar / -3°579.64.611.60.3
Apr11° / 8511.41.813.12.7
May18° / 10°8512014.45.4
Jun24° / 16°8710.8015.16.7
Jul26° / 18°7111014.86.6
Aug25° / 18°7010.4013.86.9
Sep21° / 14°739.1012.36.7
Oct15° / 7710.80.110.84.3
Nov / 669.72.49.51.2
Dec / -3°569.45.68.90.0

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 19% of June, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24852
34852
44852
54951
64852
74852
84852
94852
104852
114852
124852
134753
144753
154852
164852
174852
184951
195050
205149
215149
225248
235248
245347
255446
265446
275545
285545
295644
305644

Chance of precipitation in June

Any precipitation

Sarnia gets around 87 mm of rain over 10.8 wet days in June, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
334
434
534
634
733
833
933
1033
1133
1233
1334
1434
1535
1636
1736
1837
1937
2038
2138
2238
2338
2438
2538
2638
2738
2837
2937
3037

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 37% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
160191560
258201561
356211571
454221671
553231671
652241671
750251781
848251781
946261891
1044261992
11422719102
12402720112
13382721122
14362821132
15342822142
16332822152
17322723162
18302723172
19292723192
20282724202
21272624212
22262624222
23252624232
24242623242
25242623242
26232623253
27222623253
28222623264
29212623264
30212623264

Wind in June

Winds average 12 km/h in June.

Across June, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612calm
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in June

DaylightNight

Daylight runs from about 14 h 54 min at the start of June to 15 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over June. Sunrise moves from 4:59 AM to 4:58 AM, and sunset from 7:55 PM to 8:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.94:597:55
214.94:597:56
315.04:587:57
415.04:587:57
515.04:577:58
615.04:577:59
715.04:577:59
815.14:568:00
915.14:568:01
1015.14:568:01
1115.14:568:02
1215.14:568:03
1315.14:558:03
1415.14:558:04
1515.14:558:04
1615.24:558:04
1715.24:558:05
1815.24:558:05
1915.24:558:06
2015.24:558:06
2115.24:568:06
2215.24:568:06
2315.24:568:07
2415.24:568:07
2515.24:578:07
2615.24:578:07
2715.24:578:07
2815.24:588:07
2915.24:588:07
3015.14:588:07

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 6.37 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.36 kWh/m² to a high of 6.37 kWh/m² in June across the year — June's 6.37 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.4Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.5Intense
256.5Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
Planning a trip in June

Is June a good time to visit Sarnia?

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

6.7
Sightseeing
2nd-best month of the year
5.4
Beach & pool
3rd-best month of the year

June is a reasonable time to visit Sarnia for sightseeing.

What to pack for Sarnia in June

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

In June, Sarnia sees daytime highs around 24°C and nights near 16°C. Pack sun protection. Worth having: light clothes and rain gear. About 11 days see rain.

sun protectionlight clothesrain gear

Sea temperature near Sarnia in June

The nearest coast averages about 14°C in June — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in August at about 22°C and coldest in February near 1°C.

It's comfortable for a long swim from Jul 19 to Sep 8 — about 1.7 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr3Bracing
May7Bracing
Jun14Bracing
Jul20Refreshing
Aug22Refreshing
Sep20Cool
Oct14Bracing
Nov9Bracing
Dec5Bracing

UV index in Sarnia in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sarnia peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 20UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May7High
Jun9Very high
Jul8Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Sarnia?

Sarnia sits at 43.0°N, 82.4°W, 185 m above sea level, in Canada. The nearest listed city is Port Huron, 2.0 km away.

Topography around Sarnia

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sarnia.

Within 3 km, the terrain around Sarnia has only modest variations in elevation — a maximum elevation change of 19 m around an average of 182 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 69 m; within 80 km, only modest variations in elevation — a maximum elevation change of 216 m.

The land around Sarnia is covered by artificial surfaces (52%) and trees (22%) within 3 km, cropland (27%), trees (25%) and water (24%) within 16 km, and cropland (45%) and water (25%) within 80 km.

3 km
19 m
16 km
69 m
80 km
216 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
June weather nearby: Port Huron 2.0 km · Mount Clemens 57 km · Clinton Township 61 km · Shelby 62 km · Strathroy 64 km · Chatham 65 km · Saint Clair Shores 67 km · Sterling Heights 68 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 Sarnia (42.9787°, -82.4041°, elevation 185 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).