Melun weather in September

In September, Melun sees average daytime highs of 21°C and overnight lows near 11°C, with 49 mm of rain across 8.2 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 19°C by the end. The sky is clear or mostly clear about 23% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Melun's 3rd-clearest and 9th-windiest month. For the whole year in context, see Melun's year-round climate.

Daytime high
21°
4th warmest
Overnight low
11°
9th coldest
Rainfall
49 mm
8.2 wet days
Daylight
12 h 18 min
6:33 AM – 6:54 PM
Cloud cover
62%
3rd clearest
Wind
12 km/h
9th windiest
Solar energy
3.5 kWh/m²
Travel score
6.6
out of 10
Air quality
Moderate
PM2.5 13.6 µg/m³ · 2019

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 19°C by the end.

A typical September day in Melun reaches about 21°C in the afternoon and slips back to 11°C overnight — a 10°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 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12313
22313
32313
42313
52212
62212
72212
82212
92212
102212
112212
122212
132112
142111
152111
162111
172111
182111
192111
202011
212011
222011
232011
242011
252010
261910
271910
281910
291910
301910

How September really feels in Melun

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.

Melun weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5611.618.60.7
Feb / 509.81.19.91.3
Mar12° / 5210.80.511.63.1
Apr15° / 5110.3013.44.6
May19° / 10°6310.90155.8
Jun23° / 13°5210015.86.6
Jul25° / 15°538.8015.57.0
Aug25° / 14°558.8014.17.0
Sep21° / 11°498.2012.46.6
Oct16° / 6411010.64.8
Nov11° / 6111.70.392.3
Dec / 7212.60.98.21.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24258
34258
44258
54258
64258
74258
84159
94159
104258
114159
124159
134060
144159
154060
164060
173961
184060
193862
203862
213862
223763
233763
243664
253565
263466
273367
283268
293268
303169

Chance of precipitation in September

Any precipitation

Melun gets around 49 mm of rain over 8.2 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 34% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
123
223
323
423
523
624
725
825
926
1026
1127
1227
1328
1428
1528
1629
1729
1829
1929
2029
2130
2230
2330
2430
2531
2632
2732
2833
2933
3034

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 70% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15928121
26127111
36227101
46227101
5632791
6632791
7642781
8642781
9662770
10662770
11682660
12682660
13682660
14702550
15702550
16722440
17722440
18722440
19742330
20742330
21742330
22752320
23752320
24752320
25762220
26752230
27752230
28762130
29762130
30762130

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 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 18 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over September. Sunrise moves from 6:12 AM to 6:54 AM, and sunset from 7:27 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:127:27
213.26:137:25
313.16:147:22
413.16:167:20
513.06:177:18
613.06:197:16
712.96:207:14
812.86:227:12
912.86:237:10
1012.76:257:07
1112.76:267:05
1212.66:277:03
1312.56:297:01
1412.56:306:59
1512.46:326:56
1612.36:336:54
1712.36:356:52
1812.26:366:50
1912.26:386:48
2012.16:396:45
2112.06:406:43
2212.06:426:41
2311.96:436:39
2411.96:456:37
2511.86:466:34
2611.76:486:32
2711.76:496:30
2811.66:516:28
2911.66:526:26
3011.56:546:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.5 kWh/m².

For context, solar energy here swings from a low near 0.79 kWh/m² to a high of 5.63 kWh/m² in June across the year — September's 3.5 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.0Bright
44.0Bright
54.0Moderate
63.9Moderate
73.9Moderate
83.8Moderate
93.8Moderate
103.7Moderate
113.7Moderate
123.6Moderate
133.6Moderate
143.6Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.3Moderate
213.3Moderate
223.2Moderate
233.1Moderate
243.1Moderate
253.0Moderate
263.0Moderate
272.9Moderate
282.9Moderate
292.8Moderate
302.7Moderate
Planning a trip in September

Is September a good time to visit Melun?

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

6.6
Sightseeing
3rd-best month of the year
4.0
Beach & pool
4th-best month of the year

September is a reasonable time to visit Melun for sightseeing.

What to pack for Melun in September

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

In September, Melun sees daytime highs around 21°C and nights near 11°C. Worth packing: rain gear. About 8 days see rain.

rain gear

UV index in Melun in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Melun peaks around July 15 at about 7 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 15UV 7Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7High
Jul7High
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Melun in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Melun is worst in March — around 17 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Melun's WHO annual average of 13.6 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodMar 2317 µg/m³Nov 1711 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb14Moderate
Mar17Moderate
Apr17Moderate
May15Moderate
Jun15Moderate
Jul12Moderate
Aug12Moderate
Sep12Moderate
Oct12Good
Nov11Good
Dec12Good
Location & terrain

Where is Melun?

Melun sits at 48.5°N, 2.7°E, 73 m above sea level, in France. The nearest listed city is Le Mée-sur-Seine, 2.0 km away.

Topography around Melun

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

Within 3 km, the terrain around Melun has only modest variations in elevation — a maximum elevation change of 74 m around an average of 71 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 137 m; within 80 km, significant variations in elevation — a maximum elevation change of 271 m.

The land around Melun is covered by trees (41%) and artificial surfaces (38%) within 3 km, trees (42%) and cropland (40%) within 16 km, and cropland (55%) and trees (32%) within 80 km.

3 km
74 m
16 km
137 m
80 km
271 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Le Mée-sur-Seine 2.0 km · Dammarie-les-Lys 3.0 km · Savigny-le-Temple 6.0 km · Moissy-Cramayel 10 km · Corbeil-Essonnes 14 km · Combs-la-Ville 15 km · Fontainebleau 16 km · Brie-Comte-Robert 17 km

France travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 77% of US
price level, 2025
GDP per capita
$48,986
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.3
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 539
Religion
Roman Catholic 47%none 33%Muslim 4%Protestant 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 Melun (48.5457°, 2.6536°, elevation 73 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).