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

Innisfil in September

The short of it: Innisfil in September averages a high of 22 °C (71 °F) and a low of 11 °C (51 °F), with 84 mm (3.3 in) of rain and about 12 h 27 min of daylight. Rated 3 of 5 for a visit; the best months are June and September. Source: TerraClimate climate normals, 1991–2020.

Average high 22° · low 11° · rain 84 mm · daylight 12 h 27 min

✦✦✦ Fair for a visit · best months: June & September

September in Innisfil brings afternoons near 22° and nights around 11°, with about 84 mm of rain over the month. Much like August: highs about 22°, nights near 11°. Easy travelling weather. Wet spells are common — about 84 mm, the 3rd wettest month.

The sun is up for about 12 h 27 min in mid-September, 94 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 September 3 of 5 for a visit; the finest months here are June and September.

Against its neighbours, Innisfil runs warmer than most and about as wet in September. Barrie, 11 km to the N, sees much the same highs.

September in Innisfil, by the numbers

Warmth rank
4th warmest of 12
Rain rank
3rd wettest of 12
Versus August
4° colder, 8.0 mm more rain
Versus October
8° warmer
Day–night spread
11°
Snow season
Nov–Apr
Daylight, mid-month
12 h 27 min
Average wind
13 km/h

Neighbouring Towns

September averages · distance by the crow’s flight
TownDistanceHighLowRain
BarrieOntario11 km N22°11°88 mm
NewmarketOntario31 km SSE21°11°77 mm
AuroraOntario36 km SSE21°11°76 mm
OrilliaOntario39 km NNE21°10°90 mm
Whitchurch-StouffvilleOntario43 km SE20°11°82 mm
BoltonOntario47 km S22°11°69 mm
StouffvilleOntario49 km SE21°11°82 mm
Richmond HillOntario51 km SSE22°12°76 mm

The Almanac · Innisfil Month by Month

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

Much like August: highs about 22°, nights near 11°. Easy travelling weather. Wet spells are common — about 84 mm, the 3rd wettest month.

Climate of Innisfil by month
MonthHighLowRainWindDaylightVisit
January-4°-12°66 mm16 km/h9 h 12 min✦
February-3°-12°57 mm16 km/h10 h 23 min✦
March2°-7°49 mm15 km/h11 h 47 min✦
April9°-1°73 mm16 km/h13 h 24 min✦
May18°6°86 mm14 km/h14 h 46 min✦✦✦
June23°11°94 mm12 km/h15 h 30 min✦✦✦
July26°14°77 mm12 km/h15 h 12 min✦✦✦
August25°14°76 mm11 km/h14 h 1 min✦✦✦
September22°11°84 mm13 km/h12 h 27 min✦✦✦
October14°5°82 mm15 km/h10 h 54 min✦✦
November7°-1°77 mm16 km/h9 h 32 min✦
December0°-6°60 mm17 km/h8 h 52 min✦

Questions Readers Ask about Innisfil in September

Answered from the wire & the Almanac

What is the weather like in Innisfil in September?

Days average 22 °C (71 °F) and nights 11 °C (51 °F), with about 84 mm (3.3 in) of rain over the month. Much like August: highs about 22°, nights near 11°. Easy travelling weather. Wet spells are common — about 84 mm, the 3rd wettest month.

Is September a good time to visit Innisfil?

The Almanac gives September 3 of 5 (fair). The best months are June and September.

How long are the days in Innisfil in September?

In mid-September the sun is up for about 12 h 27 min. The days are shortening — from 8 h 52 min in December to 15 h 30 min in June.

Does it snow in Innisfil in September?

Hardly — September nights average 11 °C (51 °F), above freezing.

What should I pack for Innisfil in September?

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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