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

Slave Lake in August

The short of it: Slave Lake in August averages a high of 21 °C (71 °F) and a low of 9 °C (48 °F), with 66 mm (2.6 in) of rain and about 14 h 59 min of daylight. Rated 4 of 5 for a visit; the best months are September and May. Source: TerraClimate climate normals, 1991–2020.

Average high 21° · low 9° · rain 66 mm · daylight 14 h 59 min

✦✦✦✦ Recommended for a visit · best months: September & May

August in Slave Lake brings afternoons near 21° and nights around 9°, with about 66 mm of rain over the month. Much like July: highs about 21°, nights near 9°. Easy travelling weather. Wet spells are common — about 66 mm, the 3rd wettest month.

The sun is up for about 14 h 59 min in mid-August, 114 minutes less than a month before.

For the traveller: pack light clothes and a jacket for the evening, and an oilskin besides. The Almanac rates August 4 of 5 for a visit; the finest months here are September and May.

Against its neighbours, Slave Lake runs cooler than most and wetter than most in August. Swan Hills, 75 km to the SSW, is 2° cooler by day.

August in Slave Lake, by the numbers

Warmth rank
2nd warmest of 12
Rain rank
3rd wettest of 12
Versus July
1° colder, 32 mm less rain
Versus September
5° warmer
Day–night spread
12°
Snow season
Nov–Apr
Daylight, mid-month
14 h 59 min
Average wind
10 km/h

Neighbouring Towns

August averages · distance by the crow’s flight
TownDistanceHighLowRain
Swan HillsAlberta75 km SSW19°6°78 mm
Wabasca-DesmaraisAlberta95 km NE22°9°63 mm
High PrairieAlberta110 km W22°8°53 mm
AthabascaAlberta114 km ESE23°9°57 mm
BarrheadAlberta130 km S23°9°56 mm
WestlockAlberta139 km SSE23°9°47 mm
WhitecourtAlberta139 km SSW22°8°69 mm
McLennanAlberta142 km WNW22°8°52 mm

The Almanac · Slave Lake Month by Month

Climate normals 1991–2020 · pick a month
PrecipitationAverage highAverage low
Recommended
The Almanac Speaks
August
✦✦✦✦✦

Much like July: highs about 21°, nights near 9°. Easy travelling weather. Wet spells are common — about 66 mm, the 3rd wettest month.

Climate of Slave Lake by month
MonthHighLowRainWindDaylightVisit
January-8°-19°24 mm12 km/h7 h 42 min✦✦
February-5°-17°16 mm12 km/h9 h 33 min✦✦
March1°-11°20 mm13 km/h11 h 39 min✦✦
April9°-4°24 mm13 km/h14 h 3 min✦✦✦
May16°2°42 mm12 km/h16 h 10 min✦✦✦✦✦
June20°8°90 mm11 km/h17 h 24 min✦✦✦
July22°10°98 mm10 km/h16 h 53 min✦✦✦
August21°9°66 mm10 km/h14 h 59 min✦✦✦✦
September16°4°40 mm11 km/h12 h 37 min✦✦✦✦✦
October9°-2°29 mm12 km/h10 h 19 min✦✦✦
November-1°-10°20 mm12 km/h8 h 14 min✦✦
December-8°-17°21 mm12 km/h7 h 8 min✦✦

Questions Readers Ask about Slave Lake in August

Answered from the wire & the Almanac

What is the weather like in Slave Lake in August?

Days average 21 °C (71 °F) and nights 9 °C (48 °F), with about 66 mm (2.6 in) of rain over the month. Much like July: highs about 21°, nights near 9°. Easy travelling weather. Wet spells are common — about 66 mm, the 3rd wettest month.

Is August a good time to visit Slave Lake?

The Almanac gives August 4 of 5 (recommended). The best months are September and May.

How long are the days in Slave Lake in August?

In mid-August the sun is up for about 14 h 59 min. The days are shortening — from 7 h 8 min in December to 17 h 24 min in June.

Does it snow in Slave Lake in August?

Hardly — August nights average 9 °C (48 °F), above freezing.

What should I pack for Slave Lake in August?

Light clothes and a jacket for the evening, 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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