Castres weather in September

In September, Castres sees average daytime highs of 22°C and overnight lows near 12°C, with 73 mm of rain across 9.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 20°C by the end. The sky is clear or mostly clear about 39% 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 Castres's 3rd-clearest and 10th-windiest month. For the whole year in context, see Castres's year-round climate.

Daytime high
22°
4th warmest
Overnight low
12°
9th coldest
Rainfall
73 mm
9.2 wet days
Daylight
12 h 18 min
6:37 AM – 6:54 PM
Cloud cover
51%
3rd clearest
Wind
11 km/h
10th windiest
Solar energy
4.25 kWh/m²
Travel score
6.8
out of 10
Air quality
Good
PM10 15.3 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 24°C in the first days to 20°C by the end.

A typical September day in Castres reaches about 22°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 17°C and 27°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)
12414
22414
32414
42414
52314
62313
72313
82313
92313
102313
112313
122213
132213
142213
152212
162212
172212
182112
192112
202112
212112
222112
232112
242112
252011
262011
272011
282011
292011
302011

How September really feels in Castres

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.

Castres weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 1051339.11.2
Feb / 8211.22.710.21.8
Mar13° / 8911.81.611.63.3
Apr15° / 103130.313.24.3
May19° / 10°10412.40.114.55.6
Jun23° / 13°7510015.26.8
Jul25° / 15°598.8014.97.3
Aug26° / 15°588.5013.87.2
Sep22° / 12°739.2012.36.8
Oct17° / 10°8211.5010.85.3
Nov12° / 10112.70.79.52.8
Dec / 10012.81.68.81.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% 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 45%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36139
46040
56040
66040
76040
85941
95941
105842
115842
125743
135644
145545
155446
165446
175347
185347
195347
205347
215248
225248
235248
245149
255149
265149
275050
285050
294951
304951

Chance of precipitation in September

Any precipitation

Castres gets around 73 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 32% 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 (%)
129
229
329
429
529
630
730
830
930
1031
1131
1231
1332
1432
1532
1632
1733
1833
1933
2033
2133
2233
2333
2433
2534
2634
2735
2836
2936
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 59% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14528224
24728214
34828203
45028203
55128192
65228182
75228182
85428171
95428171
105528161
115528161
125628151
135628151
145728141
155728141
165928130
176027130
186127120
196226120
206425110
216425110
226624100
236624100
246723100
256723100
266822100
276822100
286921100
29702190
30712090

Wind in September

Winds average 11 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
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light 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 6:19 AM to 6:53 AM, and sunset from 7:22 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.16:197:22
213.06:207:20
313.06:227:19
412.96:237:17
512.96:247:15
612.86:257:13
712.86:267:11
812.76:277:09
912.76:287:07
1012.66:307:06
1112.56:317:04
1212.56:327:02
1312.46:337:00
1412.46:346:58
1512.36:356:56
1612.36:376:54
1712.26:386:52
1812.26:396:50
1912.16:406:48
2012.16:416:47
2112.06:426:45
2212.06:446:43
2311.96:456:41
2411.96:466:39
2511.86:476:37
2611.86:486:35
2711.76:496:33
2811.76:516:31
2911.66:526:30
3011.66:536:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 1.28 kWh/m² to a high of 6.31 kWh/m² in July across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.4Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.4Moderate
Planning a trip in September

Is September a good time to visit Castres?

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

6.8
Sightseeing
3rd-best month of the year
4.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Castres for sightseeing.

What to pack for Castres in September

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

In September, Castres sees daytime highs around 22°C and nights near 12°C. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Castres 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 Castres 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
Mar4Moderate
Apr5High
May7High
Jun8Very high
Jul9Very high
Aug8Very high
Sep5High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Castres 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 Castres is worst in March — around 15 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodMar 2015 µg/m³Jul 2110 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar15Moderate
Apr15Moderate
May12Good
Jun12Good
Jul10Good
Aug10Good
Sep10Good
Oct11Good
Nov11Good
Dec13Moderate
Location & terrain

Where is Castres?

Castres sits at 43.6°N, 2.2°E, 183 m above sea level, in France. The nearest listed city is Albi, 37 km away.

Topography around Castres

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

Within 3 km, the terrain around Castres has only modest variations in elevation — a maximum elevation change of 112 m around an average of 195 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 846 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,265 m.

The land around Castres is covered by trees (37%), artificial surfaces (25%) and grassland (22%) within 3 km, trees (47%), cropland (27%) and grassland (23%) within 16 km, and trees (45%) and cropland (29%) within 80 km.

3 km
112 m
16 km
846 m
80 km
1,265 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Albi 37 km · Carcassonne 44 km · Balma 60 km · Toulouse 64 km · Blagnac 69 km · Cugnaux 73 km · Colomiers 73 km · Tournefeuille 74 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 Castres (43.6053°, 2.2409°, elevation 183 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).