Greater Napanee weather in September

In September, Greater Napanee sees average daytime highs of 21°C and overnight lows near 12°C, with 85 mm of rain across 9.2 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 24°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 Greater Napanee's 1st-clearest and 9th-windiest month. For the whole year in context, see Greater Napanee's year-round climate.

Daytime high
21°
4th warmest
Overnight low
12°
9th coldest
Rainfall
85 mm
9.2 wet days
Daylight
12 h 18 min
5:53 AM – 6:11 PM
Cloud cover
55%
1st clearest
Wind
11 km/h
9th windiest
Solar energy
4.21 kWh/m²
Travel score
6.6
out of 10

Greater Napanee is town in Ontario, Canada.

Density
35/km²
people per km²
Founded
1998

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 24°C in the first days to 18°C by the end.

A typical September day in Greater Napanee reaches about 21°C in the afternoon and slips back to 12°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°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)
12414
22414
32414
42314
52314
62314
72313
82313
92313
102213
112213
122212
132212
142212
152112
162112
172111
182111
192111
202011
212011
222010
232010
241910
251910
261910
27199
28189
29189
30189

How September really feels in Greater Napanee

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.

Greater Napanee 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°7110.58.59.10.0
Feb-1° / -10°568.46.710.20.0
Mar / -5°70105.611.60.2
Apr12° / 9411.3213.22.9
May19° / 7710.6014.55.8
Jun24° / 14°9011015.36.6
Jul26° / 17°87110156.5
Aug25° / 16°8610.3013.86.8
Sep21° / 12°859.2012.36.6
Oct14° / 9311.90.210.83.8
Nov / -0°8210.32.69.40.8
Dec / -6°7810.76.68.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35545
45644
55644
65545
75545
85545
95545
105545
115545
125446
135446
145446
155347
165347
175347
185149
195149
205149
215149
225050
234951
244951
254852
264753
274654
284654
294654
304555

Chance of precipitation in September

Any precipitation

Greater Napanee gets around 85 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 36% 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
629
729
830
930
1030
1130
1230
1330
1431
1531
1631
1731
1831
1931
2031
2131
2232
2332
2433
2533
2634
2735
2835
2936
3036

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 54% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1332724142
2352723132
3362622132
4382622122
5392621122
6412621112
7422520102
8442520101
945242091
1047242091
1149231981
1250221981
1351221971
1452211971
1554211861
1655211860
1757201760
1858201750
1959201650
2060191650
2162191540
2263191440
2365181430
2466181330
2568171230
2670171120
2772161020
2872161020
297415920
307714810

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

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 5:35 AM to 6:10 AM, and sunset from 6:40 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:356:40
213.05:366:38
313.05:386:36
412.95:396:34
512.95:406:32
612.85:416:30
712.85:426:28
812.75:446:27
912.75:456:25
1012.65:466:23
1112.65:476:21
1212.55:486:19
1312.55:506:17
1412.45:516:15
1512.45:526:13
1612.35:536:11
1712.25:546:09
1812.25:556:07
1912.15:576:05
2012.15:586:03
2112.05:596:01
2212.06:006:00
2311.96:025:58
2411.96:035:56
2511.86:045:54
2611.86:055:52
2711.76:065:50
2811.76:085:48
2911.66:095:46
3011.66:105:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.21 kWh/m².

For context, solar energy here swings from a low near 1.3 kWh/m² to a high of 6.37 kWh/m² in June across the year — September's 4.21 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.1Bright
194.1Bright
204.0Bright
214.0Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Greater Napanee?

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

6.6
Sightseeing
2nd-best month of the year
4.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Greater Napanee for sightseeing.

What to pack for Greater Napanee in September

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

In September, Greater Napanee sees daytime highs around 21°C and nights near 12°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Greater Napanee in September

The nearest coast averages about 20°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 15 km away) is warmest in August at about 22°C and coldest in March near 1°C.

It's comfortable for a long swim from Jul 15 to Sep 11 — about 1.9 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan3Bracing
Feb1Bracing
Mar1Bracing
Apr3Bracing
May7Bracing
Jun15Bracing
Jul20Refreshing
Aug22Refreshing
Sep20Cool
Oct15Bracing
Nov10Bracing
Dec6Bracing

UV index in Greater Napanee 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 Greater Napanee peaks around July 12 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 highHighModerateLowJul 12UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7Very high
Jul8Very high
Aug6High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Greater Napanee?

Greater Napanee sits at 44.3°N, 76.9°W, 92 m above sea level, in Canada. The nearest listed city is Belleville, 36 km away.

Topography around Greater Napanee

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

Within 3 km, the terrain around Greater Napanee has only modest variations in elevation — a maximum elevation change of 67 m around an average of 103 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 125 m; within 80 km, significant variations in elevation — a maximum elevation change of 352 m.

The land around Greater Napanee is covered by trees (31%), cropland (28%) and grassland (27%) within 3 km, trees (43%), grassland (27%) and cropland (21%) within 16 km, and trees (44%) and water (35%) within 80 km.

3 km
67 m
16 km
125 m
80 km
352 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Belleville 36 km · Prince Edward 37 km · Kingston 37 km · Quinte West 50 km · Watertown 88 km · Oswego 95 km · Cobourg 102 km · Brockville 107 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 Greater Napanee (44.2501°, -76.9494°, elevation 92 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).