Cornwall weather in October

In October, Cornwall sees average daytime highs of 13°C and overnight lows near 5°C, with 105 mm of precipitation across 12 wet days and about 10.7 hours of daylight. It is the 6th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 10°C by the end. The sky is clear or mostly clear about 21% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of October to 10 hours by month's end. Set against the rest of the year, October is Cornwall's 6th-clearest and 7th-windiest month. For the whole year in context, see Cornwall's year-round climate.

Daytime high
13°
6th warmest
Overnight low
7th coldest
Precipitation
105 mm
12 wet days
Daylight
10 h 42 min
6:23 AM – 5:05 PM
Cloud cover
68%
6th clearest
Wind
12 km/h
7th windiest
Solar energy
2.47 kWh/m²
Travel score
3.6
out of 10

Cornwall is city in Ontario, Canada.

Air quality
Good
PM2.5 6 µg/m³ · 2019
Density
793/km²
people per km²
Founded
1784

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 17°C in the first days to 10°C by the end.

A typical October day in Cornwall reaches about 13°C in the afternoon and slips back to 5°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 20°C. Set against its neighbours, October runs about 7°C cooler than September and about 7°C warmer than November.

10°20°151015202531
Avg high (°C)Avg low (°C)
1178
2178
3177
4167
5167
6167
7167
8156
9156
10156
11156
12156
13145
14145
15145
16135
17135
18135
19134
20124
21124
22124
23124
24113
25113
26113
27113
28103
29102
30102
31102

How October really feels in Cornwall

Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 7 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
7
wind chill below the day's low

The story in October is cold — wind chill drags the overnight "feels like" below the raw low.

Cornwall weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-4° / -12°7311.410.590.0
Feb-2° / -12°61108.710.10.0
Mar / -6°7611.2711.60.2
Apr12° / 10112.12.813.22.8
May19° / 9812.20.114.65.6
Jun24° / 13°10512.4015.46.3
Jul26° / 16°10012.9015.16.2
Aug25° / 15°9411.6013.96.6
Sep21° / 11°9310.5012.36.4
Oct13° / 105120.610.73.6
Nov / -1°8412.43.79.30.6
Dec-0° / -7°8212.49.38.60.0

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 14% of October, with mostly cloudy or overcast conditions the remaining 65%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
24060
33961
43961
54060
63961
73961
83862
93763
103763
113862
123763
133763
143763
153664
163565
173466
183466
193367
203367
213268
223268
233268
243169
253070
263070
273169
283169
293070
303070
313070

Chance of precipitation in October

Any precipitationSnow

Cornwall gets around 105 mm of rain and snow over 12 wet days in October, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 42% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1380
2380
3380
4380
5370
6370
7370
8371
9381
10381
11381
12391
13391
14401
15401
16411
17411
18412
19422
20422
21422
22423
23413
24413
25413
26404
27404
28404
29404
30394
31394

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 94% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1831151
2841051
387940
487940
589830
690730
791720
892620
992620
1093520
1194510
1295410
1395410
1495410
1596310
1696310
1796310
1896310
1997210
2097210
2197210
2297210
2398200
2498200
2598200
2699100
2799100
2899100
2999100
3099100
3199100

Wind in October

Winds average 12 km/h in October.

Across October, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 30 min at the start of October to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over October. Sunrise moves from 6:03 AM to 6:43 AM, and sunset from 5:33 PM to 4:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:035:33
211.46:045:31
311.46:055:29
411.36:075:27
511.36:085:25
611.26:095:23
711.26:115:22
811.16:125:20
911.16:135:18
1011.06:155:16
1111.06:165:14
1210.96:175:12
1310.96:185:11
1410.86:205:09
1510.86:215:07
1610.76:235:05
1710.76:245:04
1810.66:255:02
1910.66:275:00
2010.56:284:59
2110.56:294:57
2210.46:314:55
2310.46:324:54
2410.36:334:52
2510.36:354:51
2610.26:364:49
2710.26:384:48
2810.16:394:46
2910.16:404:45
3010.06:424:43
3110.06:434:42

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.47 kWh/m².

For context, solar energy here swings from a low near 1.2 kWh/m² to a high of 5.91 kWh/m² in June across the year — October's 2.47 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.0Moderate
43.0Moderate
53.0Moderate
62.9Moderate
72.9Moderate
82.8Moderate
92.8Moderate
102.8Moderate
112.7Moderate
122.7Moderate
132.6Moderate
142.6Moderate
152.5Moderate
162.5Moderate
172.4Moderate
182.4Moderate
192.3Moderate
202.3Moderate
212.3Moderate
222.2Moderate
232.2Moderate
242.1Moderate
252.1Moderate
262.1Moderate
272.0Moderate
282.0Dim
292.0Dim
301.9Dim
311.9Dim
Planning a trip in October

Is October a good time to visit Cornwall?

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

3.6
Sightseeing
6th-best month of the year
0.3
Beach & pool
6th-best month of the year

October is a weaker month for outdoor sightseeing in Cornwall.

What to pack for Cornwall in October

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

In October, Cornwall sees daytime highs around 13°C and nights near 5°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

UV index in Cornwall in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cornwall peaks around July 14 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 10 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 highModerateModerateLowJul 14UV 8Jan 10UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Cornwall?

Cornwall sits at 45.0°N, 74.7°W, 59 m above sea level, in Canada. The nearest listed city is Les Coteaux, 49 km away.

Topography around Cornwall

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

Within 3 km, the terrain around Cornwall has only modest variations in elevation — a maximum elevation change of 40 m around an average of 58 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, large variations in elevation — a maximum elevation change of 1,164 m.

The land around Cornwall is covered by trees (35%) and artificial surfaces (26%) within 3 km, trees (51%) within 16 km, and trees (58%) and cropland (28%) within 80 km.

3 km
40 m
16 km
100 m
80 km
1,164 m
treesgrasslandcroplandartificial surfaceswaterwetland
October weather nearby: Les Coteaux 49 km · Salaberry-de-Valleyfield 53 km · Saint-Lazare 63 km · Vaudreuil-Dorion 69 km · Clarence-Rockland 74 km · Orléans 78 km · Fallingbrook 78 km · Gloucester 80 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 Cornwall (45.0181°, -74.7281°, elevation 59 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. 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).