Cobourg weather in September

In September, Cobourg sees average daytime highs of 20°C and overnight lows near 13°C, with 80 mm of rain across 9.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 3rd-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 33% 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 Cobourg's 3rd-clearest and 8th-windiest month. For the whole year in context, see Cobourg's year-round climate.

Daytime high
20°
4th warmest
Overnight low
13°
9th coldest
Rainfall
80 mm
9.2 wet days
Daylight
12 h 18 min
5:58 AM – 6:16 PM
Cloud cover
55%
3rd clearest
Wind
13 km/h
8th windiest
Solar energy
4.26 kWh/m²
Travel score
6.5
out of 10

Cobourg is town in Ontario, Canada.

Density
809/km²
people per km²
Founded
1798

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 Cobourg reaches about 20°C in the afternoon and slips back to 13°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 25°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12316
22316
32316
42316
52215
62215
72215
82215
92215
102215
112114
122114
132114
142114
152114
162013
172013
182013
192013
202013
211912
221912
231912
241912
251812
261811
271811
281811
291811
301711

How September really feels in Cobourg

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.

Cobourg weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -9°6710.98.59.10.0
Feb-2° / -9°528.26.610.20.0
Mar / -4°6110.35.411.60.0
Apr / 8410.6213.21.9
May15° / 7010.6014.54.7
Jun22° / 14°7810.4015.26.5
Jul25° / 18°7610.2014.96.9
Aug24° / 17°7510013.87.0
Sep20° / 13°809.2012.36.5
Oct14° / 8411.70.110.83.7
Nov / 7510.32.49.41.0
Dec / -4°7111.16.28.80.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25644
35545
45545
55545
65545
75446
85446
95347
105347
115347
125248
135248
145248
155149
165149
175149
185149
195149
205149
215149
225050
235050
245050
255050
264951
274852
284753
294753
304753

Chance of precipitation in September

Any precipitation

Cobourg gets around 80 mm of rain over 9.2 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 31% and peaks near 37% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
128
228
328
428
528
628
729
829
929
1029
1130
1230
1330
1430
1530
1630
1730
1831
1931
2031
2131
2232
2332
2433
2534
2635
2736
2836
2937
3037

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1252726202
2262725192
3282825182
4292724172
5312724162
6332723152
7342723141
8362722141
9382622131
10392622121
11412621111
12432521101
1344252191
1446242190
1547242080
1649242070
1750232070
1852231960
1953231860
2055221850
2156221750
2258221640
2359221540
2462211430
2563211330
2664211230
2767201120
2868201020
297019920
307218820

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112calm
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light 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 5:40 AM to 6:15 AM, and sunset from 6:44 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:406:44
213.05:426:42
313.05:436:41
412.95:446:39
512.95:456:37
612.85:466:35
712.85:476:33
812.75:496:31
912.75:506:29
1012.65:516:27
1112.65:526:26
1212.55:536:24
1312.55:556:22
1412.45:566:20
1512.35:576:18
1612.35:586:16
1712.25:596:14
1812.26:006:12
1912.16:026:10
2012.16:036:08
2112.06:046:06
2212.06:056:04
2311.96:066:02
2411.96:086:01
2511.86:095:59
2611.86:105:57
2711.76:115:55
2811.76:125:53
2911.66:145:51
3011.66:155:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.26 kWh/m².

For context, solar energy here swings from a low near 1.32 kWh/m² to a high of 6.46 kWh/m² in June across the year — September's 4.26 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.0Bright
224.0Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Cobourg?

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

6.5
Sightseeing
3rd-best month of the year
3.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Cobourg for sightseeing.

What to pack for Cobourg in September

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

In September, Cobourg sees daytime highs around 20°C and nights near 13°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Cobourg 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 offshore is warmest in August at about 21°C and coldest in March near 2°C.

It's comfortable for a long swim from Jul 23 to Sep 6 — about 1.5 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar2Bracing
Apr3Bracing
May6Bracing
Jun14Bracing
Jul20Cool
Aug21Refreshing
Sep19Cool
Oct14Bracing
Nov8Bracing
Dec5Bracing

UV index in Cobourg in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cobourg peaks around June 22 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 21 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 22UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May6High
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Cobourg?

Cobourg sits at 44.0°N, 78.2°W, 82 m above sea level, in Canada. The nearest listed city is Peterborough, 40 km away.

Topography around Cobourg

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

Within 3 km, the terrain around Cobourg has only modest variations in elevation — a maximum elevation change of 65 m around an average of 86 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 282 m; within 80 km, significant variations in elevation — a maximum elevation change of 394 m.

The land around Cobourg is covered by water (42%), trees (21%) and artificial surfaces (21%) within 3 km, water (48%) and trees (23%) within 16 km, and water (46%) and trees (29%) within 80 km.

3 km
65 m
16 km
282 m
80 km
394 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Peterborough 40 km · Bowmanville 42 km · Quinte West 54 km · Oshawa 55 km · Whitby 62 km · Lindsay 63 km · Brooklin 64 km · Belleville 67 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 Cobourg (43.9598°, -78.1651°, elevation 82 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).