The Frontier Gazette & Almanack
“Fair Warning for Every Town Under the Sky” · Est. 1881
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Sarnia Weather in April

Sarnia in April

The short of it: Sarnia in April averages a high of 12 °C (53 °F) and a low of 2 °C (36 °F), with 78 mm (3.1 in) of rain and about 13 h 20 min of daylight. Rated 2 of 5 for a visit; the best months are July and September. Source: TerraClimate climate normals, 1991–2020.

Average high 12° · low 2° · rain 78 mm · daylight 13 h 20 min

✦✦ Travel with care for a visit · best months: July & September

April in Sarnia brings afternoons near 12° and nights around 2°, with about 78 mm of rain over the month. Highs rise 7° against March, to near 12°; nights run about 2°. Wet spells are common — about 78 mm, the 4th wettest month. The snow cover usually melts away this month.

The sun is up for about 13 h 20 min in mid-April, 92 minutes more than a month before.

For the traveller: pack layers, a wool coat and stout boots, and an oilskin besides. The Almanac rates April 2 of 5 for a visit; the finest months here are July and September.

Against its neighbours, Sarnia runs cooler than most and about as wet in April. Port Huron, 2 km to the WSW, sees much the same highs.

April in Sarnia, by the numbers

Warmth rank
7th warmest of 12
Rain rank
4th wettest of 12
Versus March
7° warmer, 25 mm more rain
Versus May
7° colder
Day–night spread
10°
Snow season
Dec–Mar
Daylight, mid-month
13 h 20 min
Average wind
16 km/h

Neighbouring Towns

April averages · distance by the crow’s flight
TownDistanceHighLowRain
Port HuronMichigan2 km WSW12°2°78 mm
MarysvilleMichigan10 km SW12°2°78 mm
CorunnaOntario11 km SSW12°2°79 mm
Saint ClairMichigan19 km SSW12°2°77 mm
CamlachieOntario21 km ENE11°1°85 mm
PetroliaOntario23 km ESE12°2°88 mm
RichmondMichigan34 km WSW13°2°76 mm
New BaltimoreMichigan43 km SW13°3°78 mm

The Almanac · Sarnia Month by Month

Climate normals 1991–2020 · pick a month
PrecipitationAverage highAverage low
Travel with care
The Almanac Speaks
April
✦✦✦✦✦

Highs rise 7° against March, to near 12°; nights run about 2°. Wet spells are common — about 78 mm, the 4th wettest month. The snow cover usually melts away this month.

Climate of Sarnia by month
MonthHighLowRainWindDaylightVisit
January0°-8°58 mm17 km/h9 h 20 min✦
February1°-8°56 mm16 km/h10 h 28 min✦
March5°-3°53 mm16 km/h11 h 48 min✦✦
April12°2°78 mm16 km/h13 h 20 min✦✦
May19°8°81 mm14 km/h14 h 38 min✦✦✦
June25°13°91 mm11 km/h15 h 20 min✦✦✦
July27°17°69 mm10 km/h15 h 3 min✦✦✦✦
August27°16°72 mm10 km/h13 h 55 min✦✦✦
September23°13°89 mm12 km/h12 h 26 min✦✦✦
October16°7°78 mm14 km/h10 h 57 min✦✦✦
November9°1°72 mm16 km/h9 h 39 min✦
December3°-4°60 mm17 km/h9 h 1 min✦✦

Questions Readers Ask about Sarnia in April

Answered from the wire & the Almanac

What is the weather like in Sarnia in April?

Days average 12 °C (53 °F) and nights 2 °C (36 °F), with about 78 mm (3.1 in) of rain over the month. Highs rise 7° against March, to near 12°; nights run about 2°. Wet spells are common — about 78 mm, the 4th wettest month. The snow cover usually melts away this month.

Is April a good time to visit Sarnia?

The Almanac gives April 2 of 5 (travel with care). The best months are July and September.

How long are the days in Sarnia in April?

In mid-April the sun is up for about 13 h 20 min. The days are lengthening — from 9 h 1 min in December to 15 h 20 min in June.

Does it snow in Sarnia in April?

Hardly — April nights average 2 °C (36 °F), above freezing.

What should I pack for Sarnia in April?

Layers, a warm coat and stout boots, plus a good raincoat — it is a wet month.

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The Editor’s Remark

“Weather is the only news that never grows stale. Each morning the sky writes its own front page, and we at Wanted Weather are but its telegraph operators.”— J. Whitmore, Editor
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