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Sarnia

Howard Block, Port Huron

Harrington Hotel

Seventh Street–Black River Bridge

Ladies of the Maccabees Building

Ontario, Canada

Sarnia

Sarnia is a town in Ontario, Canada. It has a population of about 72,320 (2020). The climate is classified as hot-summer humid continental (Köppen Dfa), with warm summers, cold winters and precipitation in every season.

Now15°C

Best timeMay–Jun · Sep

Population72,320

Local time10:38

42.98° N, 82.40° WElevation 185 mUTC−4 · Eastern Daylight Time

14-day weather Climate by month Things to do

The year in Sarniaweather score

October: high / low16° / 7°

Rain this month83mm

Best timeMay–Jun · Sep

Best: May–Jun · Sep. Warmth, sunshine and dry days, month by month.

Sarnia at a glance

Sunrise · sunset07:52 · 18:3710 h 45 min of daylight The moon tonightWaxing gibbous85% · Moonrise 16:48 Northern lights tonightUnlikely tonightKp needed: 4.6 Next holiday25 DecemberChristmas Day Next eclipse20 Feb 2027Penumbral lunar eclipse

Best time to visitMay–Jun · Sep

The months with the highest weather score

Warmest month27°C

Average high in July

Coolest month-7°C

Average low in January

Wettest monthMay

91 mm of rain

Driest monthMarch

60 mm of rain

Monuments nearby10+

within 2.7 km

How Sarnia has grown

People living in the built-up area (43 km² today), every five years since 1975; 2030 is the projection.

+1%67k in 1975 → 67k in 2025

75

80

85

90

95

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05

10

15

20

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Weather in Sarnia

Now and the next ten days. The 14 and 30-day outlooks are one click away.

14-day forecast

15°C

Sunny · wind 9 km/h · humidity 71%

Today hour by hour

Today22 Oct19°5°

Fri23 Oct17°5°

Sat24 Oct17°3°

Sun25 Oct19°4°

Mon26 Oct16°9°0.7 mm

Tue27 Oct13°5°

Wed28 Oct17°3°

Thu29 Oct14°8°5.4 mm

Fri30 Oct11°1°

Sat31 Oct11°-1°

When to go to Sarnia

Each month's weather score (warmth, sun, dry days) with its temperatures and rain.

Climate month by month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Score	19	26	23	33	63	66	57	62	67	52	20	18
High	-1°	1°	5°	12°	19°	25°	27°	26°	23°	16°	8°	2°
Low	-7°	-7°	-3°	3°	9°	14°	18°	17°	13°	7°	1°	-4°
Rain (mm)	64	61	60	78	91	87	86	87	113	83	87	72
Wet days	12	10	12	14	16	15	15	14	14	15	13	13

Sarnia in January Sarnia in February Sarnia in March Sarnia in April Sarnia in May Sarnia in June Sarnia in July Sarnia in August Sarnia in September Sarnia in October Sarnia in November Sarnia in December

What's on in Sarnia

Concerts, football matches, the public holidays ahead and the town's festivals through the year.

Public holidays

Christmas DayNational

Boxing DayRegional holiday

Boxing DayRegional holiday

New Year's DayNational

Monuments and museums in Sarnia

Howard Block, Port HuronBuilt 1875

Harrington Hotel

Seventh Street–Black River Bridge

Sarnia railway station

Ladies of the Maccabees Building

Wilbur F. Davidson House

Thomas Edison Depot Museum

Carnegie CenterBuilt 1902

More museums: Stones 'N Bones Museum

Monuments of Ontario Museums of Ontario

Outdoors around Sarnia

Hiking routes from the town, and what there is to do within 15 km: huts, viewpoints, climbing, camping, ski areas and dive sites.

Golf courses10 Camp sites4 Viewpoints3 Theme parks1 Zoos1

Children's Animal FarmZoos

0.3 km

Great Lakes Maritime CenterViewpoints

0.5 km

SC4 TowerViewpoints

0.9 km

Port Huron Elks Lodge Golf CourseGolf courses

5.9 km

Sawmill CityTheme parks

8.2 km

Port Huron KOACamp sites

8.4 km

A. R. Colborn and Crane (Wrack)Dive site

1.7 km

Monarch (Wreck)Dive site

2.5 km

Nature around Sarnia

Nature in Canada

St. Clair River

Black River (St. Clair River tributary)

Lake Chipican

Pine Lake, Marysville

Crystal Lake, Marysville

Nature in Ontario Beaches of Canada

Wildlife in October

The birds and mammals of Canada seen most this month, compared with the rest of their year.

White-throated SparrowZonotrichia albicollis

Dark-eyed JuncoJunco hyemalis

Ring-billed GullLarus delawarensis

Blue JayCyanocitta cristata

Eastern gray squirrelSciurus carolinensis

American herring gull, Smithsonian GullLarus smithsonianus

The sky over Sarnia

Eclipses and meteor showers

The moon tonightWaxing gibbousMoonrise 16:48 · Moonset 04:54 Next eclipse seen from here20 Feb 2027Penumbral lunar eclipse Orionids~18 an hourpeak night 21 October, best at 06:08 Northern lightsKp 4.6about 28 nights a year

Earthquakes around Sarnia

The last 30 days within 300 km, and the record since 1950.

Last 30 days0magnitude 2.5+ within 300 km Since 19500magnitude 5+ within 150 km Significant earthquakes on record1within 300 km

Tropical storms · Sarnia

Tropical storm archive

C4Hurricane Ike (2008)82 km · 93 km/h

Universities and research institutes

Lambton CollegeUniversity or college · founded 1967

Towns and villages around Sarnia

Each with its own page: weather, climate and the best time to visit.

Point Edward2.4 km Woodland2.7 km Coronation Park2.8 km High Park2.9 km Oak Acres3.4 km Wiltshire Park3.6 km Woodrowe Shores3.8 km Oakwood Corners4.1 km Sherwood Village4.2 km Lucasville6.8 km Fourth Line7 km Blackwell8.3 km Corunna11 km Bunyan11 km Vyner13 km Colinville14 km Osborne14 km Mandaumin14 km Sykeston15 km

All 97 towns and villages in Lambton County Ontario

Sarnia from above

Around Sarnia31 places to see, do and reach nearby

St. Clair RiverNature3.2 km Black River (St. Clair River tributary)Nature1.4 km Lake ChipicanNature2.8 km Pine Lake, MarysvilleNature12 km Crystal Lake, MarysvilleNature13 km Trent LakeNature13 km Stag Island, OntarioNature11 km Harlem ShoalNature4.4 km A. R. Colborn and Crane (Wrack)Dive site1.7 km Monarch (Wreck)Dive site2.5 km Howard Block, Port HuronMonument1.7 km Harrington HotelMonument1.8 km Seventh Street–Black River BridgeMonument1.9 km Sarnia railway stationMonument2.7 km Ladies of the Maccabees BuildingMonument1.8 km Wilbur F. Davidson HouseMonument2.2 km Fort GratiotMonument2.7 km United States lightship HuronMonument2.2 km Thomas Edison Depot MuseumMuseum2.8 km Carnegie CenterMuseum2.0 km Port Huron MuseumMuseum2.0 km Judith & Norman Alix Art GalleryMuseum0.7 km SarniaStation2.7 km Port HuronStation3.8 km WyomingStation23 km Port HuronPlace1.9 km MarysvillePlace10 km Saint ClairPlace19 km Point EdwardPlace2.4 km PetroliaPlace23 km CamlachiePlace21 km

Getting to Sarnia

Windsor International AirportYQG

90 km

London International AirportYXU

102 km

Bishop International AirportFNT

109 km

SarniaRailway station

2.7 km

Port HuronRailway station

3.8 km

WyomingRailway station

23 km

Places near Sarnia

Port Huron

Marysville

Saint Clair

Point Edward

Petrolia

Camlachie

Corunna

Wyoming

Places with a climate like Sarnia

Matched month by month on temperature, rain and sunshine.

Waukegan

16° / 7°May–Jun · Sep

Niagara Falls

16° / 6°May–Jun · Sep

Buffalo

16° / 6°May–Jun · Sep

Toronto

14° / 7°May–Jun · Sep

Milwaukee

16° / 6°May–Jun · Sep

Lake Forest

16° / 7°May–Jun · Sep

Frequently asked questions

When is the best time to visit Sarnia?

Based on 30-year climate normals, May, June and September offer the best balance of comfortable temperatures, low rainfall and sunshine in Sarnia.

What is the hottest month in Sarnia?

July is the warmest month, with average highs of 27°C and lows of 18°C.

What is the coldest month in Sarnia?

January is the coldest month, with average highs of -1°C and lows of -7°C.

What is the rainiest month in Sarnia?

May is the wettest month with about 91 mm of precipitation on 16 wet days.