Gap weather in September

In September, Gap sees average daytime highs of 20°C and overnight lows near 8°C, with 69 mm of rain across 7.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 18°C by the end. The sky is clear or mostly clear about 49% 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 Gap's 3rd-clearest and 10th-windiest month. For the whole year in context, see Gap's year-round climate.

Daytime high
20°
4th warmest
Overnight low
9th coldest
Rainfall
69 mm
7.4 wet days
Daylight
12 h 18 min
6:21 AM – 6:39 PM
Cloud cover
44%
3rd clearest
Wind
6 km/h
10th windiest
Solar energy
4.56 kWh/m²
Travel score
6.9
out of 10
Air quality
Moderate
PM2.5 10.6 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 22°C in the first days to 18°C by the end.

A typical September day in Gap reaches about 20°C in the afternoon and slips back to 8°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 24°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12210
22210
32210
42210
52210
62210
7219
8219
9219
10219
11219
12219
13209
14209
15209
16208
17208
18208
19198
20198
21198
22198
23198
24197
25187
26187
27187
28187
29187
30187

How September really feels in Gap

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.

Gap weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°799.36.590.0
Feb / -4°577.65.410.10.6
Mar10° / -1°708.8311.62.6
Apr13° / 8611.22.113.23.7
May17° / 9011.70.214.65.4
Jun21° / 10°638.8015.36.9
Jul24° / 12°396.60158.0
Aug24° / 11°445.8013.98.0
Sep20° / 697.4012.36.9
Oct15° / 1009.10.410.74.8
Nov / -0°11910.82.99.42.0
Dec / -3°909.75.48.70.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% 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 34%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17426
27327
37327
47327
57228
67228
77228
87030
97030
106931
116931
126733
136733
146634
156634
166436
176436
186337
196337
206337
216238
226139
236139
246139
256040
265941
275941
285941
295743
305743

Chance of precipitation in September

Any precipitation

Gap gets around 69 mm of rain over 7.4 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 24% and peaks near 28% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
119
219
320
420
521
621
722
822
923
1023
1124
1224
1325
1425
1526
1626
1726
1826
1926
2026
2126
2226
2327
2427
2527
2627
2727
2827
2928
3028

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 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1955
2964
3964
4964
5964
6964
7964
8973
9973
10973
11982
12982
13982
14991
15991
16991
17991
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 6:03 AM to 6:38 AM, and sunset from 7:08 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.16:037:08
213.06:047:06
313.06:057:04
412.96:067:02
512.96:087:00
612.86:096:59
712.86:106:57
812.76:116:55
912.76:126:53
1012.66:146:51
1112.66:156:49
1212.56:166:47
1312.56:176:45
1412.46:186:43
1512.46:206:41
1612.36:216:39
1712.36:226:37
1812.26:236:35
1912.16:256:33
2012.16:266:31
2112.06:276:29
2212.06:286:27
2311.96:296:25
2411.96:316:23
2511.86:326:22
2611.86:336:20
2711.76:346:18
2811.76:366:16
2911.66:376:14
3011.66:386:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.56 kWh/m².

For context, solar energy here swings from a low near 1.5 kWh/m² to a high of 6.95 kWh/m² in July across the year — September's 4.56 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.2Bright
55.2Bright
65.1Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.5Bright
174.5Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Gap?

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

6.9
Sightseeing
3rd-best month of the year
3.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Gap for sightseeing.

What to pack for Gap in September

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

In September, Gap sees daytime highs around 20°C and nights near 8°C. Worth packing: sun protection. About 7 days see rain.

sun protection

UV index in Gap 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 Gap peaks around July 16 at about 9 (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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 16UV 9Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr7High
May7High
Jun8Very high
Jul9Very high
Aug7Very high
Sep5High
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Gap?

Gap sits at 44.6°N, 6.1°E, 741 m above sea level, in France. The nearest listed city is Digne-les-Bains, 53 km away.

Topography around Gap

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

Within 3 km, the terrain around Gap has significant variations in elevation — a maximum elevation change of 450 m around an average of 843 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,079 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,777 m.

The land around Gap is covered by trees (47%), grassland (25%) and artificial surfaces (21%) within 3 km, trees (55%) and grassland (34%) within 16 km, and trees (59%) and grassland (28%) within 80 km.

3 km
450 m
16 km
2,079 m
80 km
3,777 m
treesgrasslandcroplandartificial surfacesbare terrainmoss and lichen
September weather nearby: Digne-les-Bains 53 km · Échirolles 71 km · Saint-Martin-d'Hères 73 km · Grenoble 75 km · Meylan 76 km · Fontaine 77 km · Saint-Égrève 81 km · Manosque 84 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 Gap (44.5586°, 6.0787°, elevation 741 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).