Barrie weather in September

In September, Barrie sees average daytime highs of 20°C and overnight lows near 11°C, with 80 mm of rain across 11 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 18°C by the end. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Barrie's 4th-clearest and 9th-windiest month. For the whole year in context, see Barrie's year-round climate.

Daytime high
20°
4th warmest
Overnight low
11°
9th coldest
Rainfall
80 mm
11 wet days
Daylight
12 h 18 min
6:04 AM – 6:22 PM
Cloud cover
58%
4th clearest
Wind
12 km/h
9th windiest
Solar energy
3.98 kWh/m²
Travel score
6.2
out of 10

Barrie is city in Ontario, Canada.

Air quality
Good
PM2.5 7 µg/m³ · 2019
Density
1,920/km²
people per km²
Founded
1812

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 18°C by the end.

A typical September day in Barrie reaches about 20°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 26°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12314
22314
32313
42213
52213
62213
72213
82213
92212
102112
112112
122112
132112
142111
152111
162011
172011
182011
192010
202010
211910
221910
231910
24199
25189
26189
27189
28189
29178
30178

How September really feels in Barrie

Once humidity and wind are folded in, September 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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Barrie weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -11°6111.811.990.0
Feb-2° / -11°488.78.710.10.0
Mar / -6°57106.811.60.1
Apr11° / 77113.213.22.4
May18° / 8210.5014.65.5
Jun23° / 13°8710.7015.36.6
Jul25° / 16°8011.40156.7
Aug24° / 15°8411.1013.86.9
Sep20° / 11°8011012.36.2
Oct13° / 8213.20.410.83.3
Nov / -1°7412.359.40.5
Dec-0° / -6°6313.2118.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25446
35446
45446
55347
65347
75347
85248
95149
105248
115149
125149
135050
145050
155050
165050
175050
184951
194951
204852
214852
224753
234753
244654
254555
264456
274456
284258
294258
304357

Chance of precipitation in September

Any precipitation

Barrie gets around 80 mm of rain over 11 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
436
536
636
736
836
936
1036
1136
1236
1336
1436
1535
1635
1735
1835
1935
2035
2136
2236
2337
2438
2538
2639
2740
2841
2941
3041

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
139282211
241272111
343272010
444261910
54626189
64825189
75025178
85125168
95324167
105424157
115723146
125723146
136022135
146022135
156221134
166321124
176421123
186620113
196719113
206819112
217018102
227018102
23721792
24751681
25751681
26771571
27781471
28801361
29801361
30831250

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 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
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over September. Sunrise moves from 5:46 AM to 6:21 AM, and sunset from 6:51 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:466:51
213.05:476:49
313.05:486:47
412.95:506:45
512.95:516:43
612.85:526:41
712.85:536:39
812.75:546:38
912.75:566:36
1012.65:576:34
1112.65:586:32
1212.55:596:30
1312.56:006:28
1412.46:026:26
1512.46:036:24
1612.36:046:22
1712.36:056:20
1812.26:066:18
1912.16:086:16
2012.16:096:14
2112.06:106:12
2212.06:116:10
2311.96:126:08
2411.96:146:06
2511.86:156:05
2611.86:166:03
2711.76:176:01
2811.76:195:59
2911.66:205:57
3011.66:215:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.98 kWh/m².

For context, solar energy here swings from a low near 1.22 kWh/m² to a high of 6.29 kWh/m² in June across the year — September's 3.98 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.5Bright
54.5Bright
64.4Bright
74.4Bright
84.3Bright
94.3Bright
104.2Bright
114.2Bright
124.1Bright
134.1Bright
144.0Bright
154.0Bright
164.0Moderate
173.9Moderate
183.9Moderate
193.8Moderate
203.8Moderate
213.7Moderate
223.7Moderate
233.6Moderate
243.6Moderate
253.5Moderate
263.5Moderate
273.4Moderate
283.4Moderate
293.3Moderate
303.3Moderate
Planning a trip in September

Is September a good time to visit Barrie?

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

6.2
Sightseeing
4th-best month of the year
3.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Barrie for sightseeing.

What to pack for Barrie in September

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

In September, Barrie sees daytime highs around 20°C and nights near 11°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Barrie in September

The nearest coast averages about 19°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 44 km away) is warmest in August at about 21°C and coldest in March near 1°C.

It's comfortable for a long swim from Aug 9 to Aug 24 — about 0.5 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan3Bracing
Feb2Bracing
Mar1Bracing
Apr2Bracing
May5Bracing
Jun11Bracing
Jul19Cool
Aug21Refreshing
Sep19Cool
Oct13Bracing
Nov9Bracing
Dec6Bracing

UV index in Barrie in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Barrie peaks around June 21 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 21UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5High
May6High
Jun8Very high
Jul8Very high
Aug6High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Barrie?

Barrie sits at 44.4°N, 79.7°W, 269 m above sea level, in Canada. The nearest listed city is Innisfil, 11 km away.

Topography around Barrie

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

Within 3 km, the terrain around Barrie has only modest variations in elevation — a maximum elevation change of 83 m around an average of 244 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 239 m; within 80 km, significant variations in elevation — a maximum elevation change of 471 m.

The land around Barrie is covered by water (30%), artificial surfaces (29%) and trees (27%) within 3 km, trees (42%) and cropland (26%) within 16 km, and trees (43%) and cropland (22%) within 80 km.

3 km
83 m
16 km
239 m
80 km
471 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Innisfil 11 km · Keswick 23 km · Orillia 30 km · Wasaga Beach 31 km · Alliston 32 km · East Gwillimbury 38 km · Newmarket 42 km · Midland 43 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 Barrie (44.4001°, -79.6663°, elevation 269 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).