Blois weather in September

In September, Blois sees average daytime highs of 22°C and overnight lows near 12°C, with 48 mm of rain across 7.8 wet days and about 12.4 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 25% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Blois's 3rd-clearest and 10th-windiest month. For the whole year in context, see Blois's year-round climate.

Daytime high: 22°; 4th warmest
Overnight low: 12°; 9th coldest
Rainfall: 48 mm; 7.8 wet days
Daylight: 12 h 18 min; 6:39 AM – 6:59 PM
Cloud cover: 61%; 3rd clearest
Wind: 12 km/h; 10th windiest
Solar energy: 3.72 kWh/m²
Travel score: 6.8; out of 10

Blois is French commune and city in Loir-et-Cher, Centre-Val de Loire.

Air quality: Excellent; PM10 14.2 µg/m³ · 2019
Density: 1,432/km²; people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Blois year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 Blois reaches about 22°C in the afternoon and slips back to 12°C overnight — a 10°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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	24	24	24	23	23	23	23	23	23	23	22	22	22	22	22	22	22	21	21	21	21	21	21	20	20	20	20	20	20	19
Avg low (°C)	13	13	13	13	13	13	12	12	12	12	12	12	12	12	12	11	11	11	11	11	11	11	11	11	11	11	11	11	10	10

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	23	13
5	23	13
6	23	13
7	23	12
8	23	12
9	23	12
10	23	12
11	22	12
12	22	12
13	22	12
14	22	12
15	22	12
16	22	11
17	22	11
18	21	11
19	21	11
20	21	11
21	21	11
22	21	11
23	21	11
24	20	11
25	20	11
26	20	11
27	20	11
28	20	11
29	20	10
30	19	10

How September really feels in Blois

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

heat index over the day's high

Days feeling ≤ 0°C

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.

Blois 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	8° / 2°	59	11.2	0.8	8.7	1.1
Feb	9° / 2°	48	9.8	1.1	9.9	1.6
Mar	13° / 4°	52	10	0.3	11.6	3.4
Apr	16° / 6°	54	10.6	0	13.3	4.7
May	19° / 10°	69	11.4	0	14.9	5.8
Jun	23° / 13°	48	8.5	0	15.7	6.8
Jul	26° / 15°	48	8.1	0	15.4	7.1
Aug	26° / 15°	49	8.2	0	14.1	7.0
Sep	22° / 12°	48	7.8	0	12.4	6.8
Oct	17° / 9°	67	11	0	10.6	5.0
Nov	11° / 5°	65	11.5	0.1	9.1	2.6
Dec	8° / 3°	69	11.8	0.7	8.3	1.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 61%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	44	44	44	44	44	44	43	43	41	41	42	41	41	41	40	39	39	39	39	39	38	38	38	37	37	36	34	34	33	32
Cloudier (%)	56	56	56	56	56	56	57	57	59	59	58	59	59	59	60	61	61	61	61	61	62	62	62	63	63	64	66	66	67	68

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	44	56
6	44	56
7	43	57
8	43	57
9	41	59
10	41	59
11	42	58
12	41	59
13	41	59
14	41	59
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	37	63
26	36	64
27	34	66
28	34	66
29	33	67
30	32	68

Chance of precipitation in September

Any precipitation

Blois gets around 48 mm of rain over 7.8 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 27% and peaks near 33% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	24	23	23	24	24	24	24	25	25	25	25	26	26	26	27	27	27	27	27	28	28	28	28	29	29	30	31	32	32	33

	Rain chance (%)
1	24
2	23
3	23
4	24
5	24
6	24
7	24
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	27
16	27
17	27
18	27
19	27
20	28
21	28
22	28
23	28
24	29
25	29
26	30
27	31
28	32
29	32
30	33

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 69% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	62	63	64	64	65	66	65	66	67	67	68	68	69	69	69	71	71	71	71	72	73	73	73	73	73	72	72	72	72	73
Comfortable (%)	26	26	26	26	26	26	27	27	27	27	27	27	26	26	26	25	25	25	25	24	24	24	24	24	24	24	24	24	24	23
Humid (%)	11	10	9	9	8	7	7	6	6	6	5	5	5	5	5	4	4	4	4	4	3	3	3	3	3	4	4	4	4	4
Muggy (%)	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	26	11	1
2	63	26	10	1
3	64	26	9	1
4	64	26	9	1
5	65	26	8	1
6	66	26	7	1
7	65	27	7	1
8	66	27	6	1
9	67	27	6	0
10	67	27	6	0
11	68	27	5	0
12	68	27	5	0
13	69	26	5	0
14	69	26	5	0
15	69	26	5	0
16	71	25	4	0
17	71	25	4	0
18	71	25	4	0
19	71	25	4	0
20	72	24	4	0
21	73	24	3	0
22	73	24	3	0
23	73	24	3	0
24	73	24	3	0
25	73	24	3	0
26	72	24	4	0
27	72	24	4	0
28	72	24	4	0
29	72	24	4	0
30	73	23	4	0

Wind in September

Winds average 12 km/h in September.

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

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Feels	calm	calm	calm	calm	calm	calm	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	12	calm
2	12	calm
3	12	calm
4	12	calm
5	12	calm
6	12	calm
7	12	light breeze
8	12	light breeze
9	12	light breeze
10	12	light breeze
11	12	light breeze
12	12	light breeze
13	12	light breeze
14	12	light breeze
15	12	light breeze
16	12	light breeze
17	12	light breeze
18	12	light breeze
19	12	light breeze
20	12	light breeze
21	12	light breeze
22	12	light breeze
23	12	light breeze
24	12	light breeze
25	12	light breeze
26	12	light breeze
27	12	light breeze
28	12	light breeze
29	12	light breeze
30	12	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 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 102 minutes over September. Sunrise moves from 6:18 AM to 6:59 AM, and sunset from 7:31 PM to 6:29 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	13.2	13.2	13.1	13.0	13.0	12.9	12.9	12.8	12.7	12.7	12.6	12.6	12.5	12.5	12.4	12.3	12.3	12.2	12.2	12.1	12.0	12.0	11.9	11.9	11.8	11.7	11.7	11.6	11.6	11.5
Sunrise (AM)	6:18	6:19	6:21	6:22	6:24	6:25	6:26	6:28	6:29	6:31	6:32	6:33	6:35	6:36	6:37	6:39	6:40	6:42	6:43	6:44	6:46	6:47	6:49	6:50	6:51	6:53	6:54	6:56	6:57	6:59
Sunset (PM)	7:31	7:29	7:27	7:25	7:22	7:20	7:18	7:16	7:14	7:12	7:10	7:08	7:06	7:03	7:01	6:59	6:57	6:55	6:53	6:51	6:48	6:46	6:44	6:42	6:40	6:38	6:36	6:34	6:32	6:29

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.2	6:18	7:31
2	13.2	6:19	7:29
3	13.1	6:21	7:27
4	13.0	6:22	7:25
5	13.0	6:24	7:22
6	12.9	6:25	7:20
7	12.9	6:26	7:18
8	12.8	6:28	7:16
9	12.7	6:29	7:14
10	12.7	6:31	7:12
11	12.6	6:32	7:10
12	12.6	6:33	7:08
13	12.5	6:35	7:06
14	12.5	6:36	7:03
15	12.4	6:37	7:01
16	12.3	6:39	6:59
17	12.3	6:40	6:57
18	12.2	6:42	6:55
19	12.2	6:43	6:53
20	12.1	6:44	6:51
21	12.0	6:46	6:48
22	12.0	6:47	6:46
23	11.9	6:49	6:44
24	11.9	6:50	6:42
25	11.8	6:51	6:40
26	11.7	6:53	6:38
27	11.7	6:54	6:36
28	11.6	6:56	6:34
29	11.6	6:57	6:32
30	11.5	6:59	6:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.72 kWh/m².

For context, solar energy here swings from a low near 0.89 kWh/m² to a high of 5.74 kWh/m² in June across the year — September's 3.72 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.4	4.3	4.3	4.2	4.2	4.2	4.1	4.1	4.0	4.0	3.9	3.9	3.8	3.8	3.7	3.7	3.6	3.6	3.5	3.5	3.4	3.4	3.3	3.3	3.2	3.1	3.1	3.0	3.0	2.9
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.4	Bright
2	4.3	Bright
3	4.3	Bright
4	4.2	Bright
5	4.2	Bright
6	4.2	Bright
7	4.1	Bright
8	4.1	Bright
9	4.0	Bright
10	4.0	Moderate
11	3.9	Moderate
12	3.9	Moderate
13	3.8	Moderate
14	3.8	Moderate
15	3.7	Moderate
16	3.7	Moderate
17	3.6	Moderate
18	3.6	Moderate
19	3.5	Moderate
20	3.5	Moderate
21	3.4	Moderate
22	3.4	Moderate
23	3.3	Moderate
24	3.3	Moderate
25	3.2	Moderate
26	3.1	Moderate
27	3.1	Moderate
28	3.0	Moderate
29	3.0	Moderate
30	2.9	Moderate

Planning a trip in September

Is September a good time to visit Blois?

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 Blois for sightseeing.

What to pack for Blois in September

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

In September, Blois sees daytime highs around 22°C and nights near 12°C. Little to plan around — just the basics. About 8 days see rain.

UV index in Blois 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 Blois peaks around July 24 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	4	5	6	7	7	7	5	3	1	1
Level	Low	Low	Moderate	High	High	High	High	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	4	Moderate
Apr	5	High
May	6	High
Jun	7	High
Jul	7	High
Aug	7	High
Sep	5	Moderate
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Location & terrain

Where is Blois?

Blois sits at 47.6°N, 1.3°E, 109 m above sea level, in France. The nearest listed city is Vendôme, 30 km away.

Topography around Blois

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

Within 3 km, the terrain around Blois has only modest variations in elevation — a maximum elevation change of 98 m around an average of 97 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 119 m; within 80 km, significant variations in elevation — a maximum elevation change of 265 m.

The land around Blois is covered by artificial surfaces (41%) and trees (23%) within 3 km, cropland (45%) and trees (35%) within 16 km, and cropland (49%) and trees (37%) within 80 km.

3 km

98 m

artificial surfaces 41%

16 km

119 m

cropland 45%

80 km

265 m

cropland 49%

treesgrasslandcroplandartificial surfaceswater

← August Blois year-round climate October →Best places to visit in September

September weather nearby: Vendôme 30 km · Romorantin-Lanthenay 41 km · Saint-Pierre-des-Corps 49 km · Saint-Avertin 51 km · Tours 52 km · Olivet 52 km · Châteaudun 53 km · Saint-Jean-de-la-Ruelle 53 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

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 Blois (47.5943°, 1.3291°, elevation 109 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).

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	23	13
5	23	13
6	23	13
7	23	12
8	23	12
9	23	12
10	23	12
11	22	12
12	22	12
13	22	12
14	22	12
15	22	12
16	22	11
17	22	11
18	21	11
19	21	11
20	21	11
21	21	11
22	21	11
23	21	11
24	20	11
25	20	11
26	20	11
27	20	11
28	20	11
29	20	10
30	19	10

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	44	56
6	44	56
7	43	57
8	43	57
9	41	59
10	41	59
11	42	58
12	41	59
13	41	59
14	41	59
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	37	63
26	36	64
27	34	66
28	34	66
29	33	67
30	32	68

	Rain chance (%)
1	24
2	23
3	23
4	24
5	24
6	24
7	24
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	27
16	27
17	27
18	27
19	27
20	28
21	28
22	28
23	28
24	29
25	29
26	30
27	31
28	32
29	32
30	33

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	26	11	1
2	63	26	10	1
3	64	26	9	1
4	64	26	9	1
5	65	26	8	1
6	66	26	7	1
7	65	27	7	1
8	66	27	6	1
9	67	27	6	0
10	67	27	6	0
11	68	27	5	0
12	68	27	5	0
13	69	26	5	0
14	69	26	5	0
15	69	26	5	0
16	71	25	4	0
17	71	25	4	0
18	71	25	4	0
19	71	25	4	0
20	72	24	4	0
21	73	24	3	0
22	73	24	3	0
23	73	24	3	0
24	73	24	3	0
25	73	24	3	0
26	72	24	4	0
27	72	24	4	0
28	72	24	4	0
29	72	24	4	0
30	73	23	4	0

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	23	13
5	23	13
6	23	13
7	23	12
8	23	12
9	23	12
10	23	12
11	22	12
12	22	12
13	22	12
14	22	12
15	22	12
16	22	11
17	22	11
18	21	11
19	21	11
20	21	11
21	21	11
22	21	11
23	21	11
24	20	11
25	20	11
26	20	11
27	20	11
28	20	11
29	20	10
30	19	10

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	44	56
6	44	56
7	43	57
8	43	57
9	41	59
10	41	59
11	42	58
12	41	59
13	41	59
14	41	59
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	37	63
26	36	64
27	34	66
28	34	66
29	33	67
30	32	68

	Rain chance (%)
1	24
2	23
3	23
4	24
5	24
6	24
7	24
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	27
16	27
17	27
18	27
19	27
20	28
21	28
22	28
23	28
24	29
25	29
26	30
27	31
28	32
29	32
30	33

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	26	11	1
2	63	26	10	1
3	64	26	9	1
4	64	26	9	1
5	65	26	8	1
6	66	26	7	1
7	65	27	7	1
8	66	27	6	1
9	67	27	6	0
10	67	27	6	0
11	68	27	5	0
12	68	27	5	0
13	69	26	5	0
14	69	26	5	0
15	69	26	5	0
16	71	25	4	0
17	71	25	4	0
18	71	25	4	0
19	71	25	4	0
20	72	24	4	0
21	73	24	3	0
22	73	24	3	0
23	73	24	3	0
24	73	24	3	0
25	73	24	3	0
26	72	24	4	0
27	72	24	4	0
28	72	24	4	0
29	72	24	4	0
30	73	23	4	0

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	23	13
5	23	13
6	23	13
7	23	12
8	23	12
9	23	12
10	23	12
11	22	12
12	22	12
13	22	12
14	22	12
15	22	12
16	22	11
17	22	11
18	21	11
19	21	11
20	21	11
21	21	11
22	21	11
23	21	11
24	20	11
25	20	11
26	20	11
27	20	11
28	20	11
29	20	10
30	19	10

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	44	56
6	44	56
7	43	57
8	43	57
9	41	59
10	41	59
11	42	58
12	41	59
13	41	59
14	41	59
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	37	63
26	36	64
27	34	66
28	34	66
29	33	67
30	32	68

	Rain chance (%)
1	24
2	23
3	23
4	24
5	24
6	24
7	24
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	27
16	27
17	27
18	27
19	27
20	28
21	28
22	28
23	28
24	29
25	29
26	30
27	31
28	32
29	32
30	33

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	26	11	1
2	63	26	10	1
3	64	26	9	1
4	64	26	9	1
5	65	26	8	1
6	66	26	7	1
7	65	27	7	1
8	66	27	6	1
9	67	27	6	0
10	67	27	6	0
11	68	27	5	0
12	68	27	5	0
13	69	26	5	0
14	69	26	5	0
15	69	26	5	0
16	71	25	4	0
17	71	25	4	0
18	71	25	4	0
19	71	25	4	0
20	72	24	4	0
21	73	24	3	0
22	73	24	3	0
23	73	24	3	0
24	73	24	3	0
25	73	24	3	0
26	72	24	4	0
27	72	24	4	0
28	72	24	4	0
29	72	24	4	0
30	73	23	4	0