Saint-Louis weather in May

In May, Saint-Louis sees average daytime highs of 18°C and overnight lows near 9°C, with 129 mm of precipitation across 16.8 wet days and about 14.9 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 17°C in the first days to 20°C by the end. The sky is clear or mostly clear about 19% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 12 min at the start of May to 15 h 24 min by month's end. Set against the rest of the year, May is Saint-Louis's 7th-clearest and 7th-windiest month. For the whole year in context, see Saint-Louis's year-round climate.

Daytime high: 18°; 5th warmest
Overnight low: 9°; 8th coldest
Precipitation: 129 mm; 16.8 wet days
Daylight: 14 h 54 min; 4:59 AM – 7:53 PM
Cloud cover: 67%; 7th clearest
Wind: 7 km/h; 7th windiest
Solar energy: 5.09 kWh/m²
Travel score: 4.9; out of 10

← April Saint-Louis year-round climate June →Best places to visit in May

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 17°C in the first days to 20°C by the end.

A typical May day in Saint-Louis reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 25°C. Set against its neighbours, May runs about 4°C warmer than April and about 4°C cooler than June.

	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	31
Avg high (°C)	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	19	19	19	19	19	19	19	20	20	20	20	20	20	20
Avg low (°C)	7	7	8	8	8	8	8	8	8	8	8	8	9	9	9	9	9	9	9	9	9	9	10	10	10	10	10	10	10	11	11

	Avg high (°C)	Avg low (°C)
1	17	7
2	17	7
3	17	8
4	17	8
5	17	8
6	17	8
7	17	8
8	17	8
9	17	8
10	18	8
11	18	8
12	18	8
13	18	9
14	18	9
15	18	9
16	18	9
17	18	9
18	19	9
19	19	9
20	19	9
21	19	9
22	19	9
23	19	10
24	19	10
25	20	10
26	20	10
27	20	10
28	20	10
29	20	10
30	20	11
31	20	11

How May really feels in Saint-Louis

Once humidity and wind are folded in, May 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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Saint-Louis weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	4° / -1°	80	13.5	6	8.7	0.0
Feb	6° / -1°	72	11.5	5.5	9.9	0.4
Mar	10° / 2°	83	13.5	3.9	11.6	2.2
Apr	14° / 5°	90	14.1	1.6	13.3	3.8
May	18° / 9°	129	16.8	0.1	14.9	4.9
Jun	22° / 12°	118	15.8	0	15.7	5.7
Jul	24° / 14°	121	15.4	0	15.4	6.2
Aug	24° / 14°	125	15.2	0	14.1	6.2
Sep	19° / 10°	95	12.6	0	12.4	5.7
Oct	14° / 7°	97	13.2	0.3	10.6	3.8
Nov	8° / 2°	94	13	2.8	9.1	1.3
Dec	5° / -0°	101	14.1	5.5	8.3	0.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 66%. Skies tend to open up as the month goes on.

	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	31
Clearer (%)	31	30	30	30	30	30	29	30	30	30	31	31	31	32	32	33	33	34	35	37	37	37	38	38	38	39	40	40	39	37	37
Cloudier (%)	69	70	70	70	70	70	71	70	70	70	69	69	69	68	68	67	67	66	65	63	63	63	62	62	62	61	60	60	61	63	63

	Clearer (%)	Cloudier (%)
1	31	69
2	30	70
3	30	70
4	30	70
5	30	70
6	30	70
7	29	71
8	30	70
9	30	70
10	30	70
11	31	69
12	31	69
13	31	69
14	32	68
15	32	68
16	33	67
17	33	67
18	34	66
19	35	65
20	37	63
21	37	63
22	37	63
23	38	62
24	38	62
25	38	62
26	39	61
27	40	60
28	40	60
29	39	61
30	37	63
31	37	63

Chance of precipitation in May

Any precipitationSnow

Saint-Louis gets around 129 mm of rain and snow over 16.8 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 55% and peaks near 58% on the wettest days, and about 0 day brings snow.

	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	31
Rain chance (%)	56	57	57	58	58	58	58	58	58	57	57	57	57	56	56	56	55	54	54	53	52	52	51	51	51	51	51	51	52	53	54
Snow chance (%)	2	1	1	1	1	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

	Rain chance (%)	Snow chance (%)
1	56	2
2	57	1
3	57	1
4	58	1
5	58	1
6	58	1
7	58	1
8	58	1
9	58	1
10	57	1
11	57	1
12	57	1
13	57	1
14	56	0
15	56	0
16	56	0
17	55	0
18	54	0
19	54	0
20	53	0
21	52	0
22	52	0
23	51	0
24	51	0
25	51	0
26	51	0
27	51	0
28	51	0
29	52	0
30	53	0
31	54	0

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 91% 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	31
Dry (%)	99	98	98	98	97	97	97	96	96	96	95	95	95	95	94	94	93	92	92	91	90	88	87	85	84	83	81	79	77	76	74
Comfortable (%)	1	2	2	2	3	3	3	4	4	4	5	5	5	5	6	6	7	8	8	9	10	11	12	14	15	16	17	19	20	21	22
Humid (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	2	2	3	3	4

	Dry (%)	Comfortable (%)	Humid (%)
1	99	1	0
2	98	2	0
3	98	2	0
4	98	2	0
5	97	3	0
6	97	3	0
7	97	3	0
8	96	4	0
9	96	4	0
10	96	4	0
11	95	5	0
12	95	5	0
13	95	5	0
14	95	5	0
15	94	6	0
16	94	6	0
17	93	7	0
18	92	8	0
19	92	8	0
20	91	9	0
21	90	10	0
22	88	11	1
23	87	12	1
24	85	14	1
25	84	15	1
26	83	16	1
27	81	17	2
28	79	19	2
29	77	20	3
30	76	21	3
31	74	22	4

Wind in May

Winds average 7 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 8 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	31
Wind speed (km/h)	7	7	7	7	8	8	8	8	8	8	8	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	7	calm
2	7	calm
3	7	calm
4	7	calm
5	8	calm
6	8	calm
7	8	calm
8	8	calm
9	8	calm
10	8	calm
11	8	calm
12	7	calm
13	7	calm
14	7	calm
15	7	calm
16	7	calm
17	7	calm
18	7	calm
19	7	calm
20	7	calm
21	7	calm
22	7	calm
23	7	calm
24	7	calm
25	7	calm
26	7	calm
27	7	calm
28	7	calm
29	7	calm
30	7	calm
31	7	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 12 min at the start of May to 15 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 72 minutes over May. Sunrise moves from 5:21 AM to 4:44 AM, and sunset from 7:33 PM to 8:10 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	31
Daylight (h)	14.2	14.2	14.3	14.3	14.4	14.4	14.5	14.5	14.6	14.6	14.7	14.7	14.8	14.8	14.9	14.9	14.9	15.0	15.0	15.1	15.1	15.1	15.2	15.2	15.3	15.3	15.3	15.4	15.4	15.4	15.4
Sunrise (AM)	5:21	5:19	5:18	5:16	5:15	5:13	5:12	5:10	5:09	5:07	5:06	5:04	5:03	5:01	5:00	4:59	4:58	4:56	4:55	4:54	4:53	4:52	4:51	4:50	4:49	4:48	4:47	4:46	4:45	4:45	4:44
Sunset (PM)	7:33	7:34	7:36	7:37	7:38	7:40	7:41	7:42	7:44	7:45	7:47	7:48	7:49	7:51	7:52	7:53	7:54	7:56	7:57	7:58	7:59	8:01	8:02	8:03	8:04	8:05	8:06	8:07	8:08	8:09	8:10

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	14.2	5:21	7:33
2	14.2	5:19	7:34
3	14.3	5:18	7:36
4	14.3	5:16	7:37
5	14.4	5:15	7:38
6	14.4	5:13	7:40
7	14.5	5:12	7:41
8	14.5	5:10	7:42
9	14.6	5:09	7:44
10	14.6	5:07	7:45
11	14.7	5:06	7:47
12	14.7	5:04	7:48
13	14.8	5:03	7:49
14	14.8	5:01	7:51
15	14.9	5:00	7:52
16	14.9	4:59	7:53
17	14.9	4:58	7:54
18	15.0	4:56	7:56
19	15.0	4:55	7:57
20	15.1	4:54	7:58
21	15.1	4:53	7:59
22	15.1	4:52	8:01
23	15.2	4:51	8:02
24	15.2	4:50	8:03
25	15.3	4:49	8:04
26	15.3	4:48	8:05
27	15.3	4:47	8:06
28	15.4	4:46	8:07
29	15.4	4:45	8:08
30	15.4	4:45	8:09
31	15.4	4:44	8:10

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.09 kWh/m².

For context, solar energy here swings from a low near 0.98 kWh/m² to a high of 5.59 kWh/m² in June across the year — May's 5.09 kWh/m² sits near the top of that range.

	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	31
Solar energy (kWh/m²)	4.7	4.7	4.7	4.7	4.7	4.8	4.8	4.8	4.8	4.8	4.9	4.9	5.0	5.0	5.0	5.1	5.1	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.4	5.4	5.4	5.4	5.4	5.4	5.4
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.7	Bright
2	4.7	Bright
3	4.7	Bright
4	4.7	Bright
5	4.7	Bright
6	4.8	Bright
7	4.8	Bright
8	4.8	Bright
9	4.8	Bright
10	4.8	Bright
11	4.9	Bright
12	4.9	Bright
13	5.0	Bright
14	5.0	Bright
15	5.0	Bright
16	5.1	Bright
17	5.1	Bright
18	5.2	Bright
19	5.2	Bright
20	5.2	Bright
21	5.3	Bright
22	5.3	Bright
23	5.3	Bright
24	5.3	Bright
25	5.4	Bright
26	5.4	Bright
27	5.4	Bright
28	5.4	Bright
29	5.4	Bright
30	5.4	Bright
31	5.4	Bright

Planning a trip in May

Is May a good time to visit Saint-Louis?

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

4.9

Sightseeing

5th-best month of the year

1.8

Beach & pool

5th-best month of the year

May is a reasonable time to visit Saint-Louis for sightseeing.

What to pack for Saint-Louis in May

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

In May, Saint-Louis sees daytime highs around 18°C and nights near 9°C. Pack rain gear. Worth having: sun protection. About 17 days see rain.

rain gearsun protection

UV index in Saint-Louis in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saint-Louis peaks around July 14 at about 8 (very 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 8 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	4	5	7	7	8	6	4	3	2	1
Level	Low	Low	Moderate	Moderate	High	Very high	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	4	Moderate
Apr	5	Moderate
May	7	High
Jun	7	Very high
Jul	8	Very high
Aug	6	High
Sep	4	Moderate
Oct	3	Moderate
Nov	2	Low
Dec	1	Low

Location & terrain

Where is Saint-Louis?

Saint-Louis sits at 47.6°N, 7.6°E, 248 m above sea level, in France. The nearest listed city is Basel, 4.0 km away.

Topography around Saint-Louis

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

Within 3 km, the terrain around Saint-Louis has only modest variations in elevation — a maximum elevation change of 49 m around an average of 256 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 626 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,427 m.

The land around Saint-Louis is covered by artificial surfaces (46%) within 3 km, trees (43%) and cropland (26%) within 16 km, and trees (54%) and grassland (23%) within 80 km.

3 km

49 m

artificial surfaces 46%

16 km

626 m

trees 43%

80 km

1,427 m

trees 54%

treesgrasslandcroplandartificial surfacesbare terrainwater

← April Saint-Louis year-round climate June →Best places to visit in May

May weather nearby: Basel 4.0 km · Weil am Rhein 5.0 km · Allschwil 5.0 km · Riehen 7.0 km · Lörrach 8.0 km · Muttenz 10 km · Reinach 11 km · Rheinfelden 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

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 Saint-Louis (47.5921°, 7.5592°, elevation 248 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	17	7
2	17	7
3	17	8
4	17	8
5	17	8
6	17	8
7	17	8
8	17	8
9	17	8
10	18	8
11	18	8
12	18	8
13	18	9
14	18	9
15	18	9
16	18	9
17	18	9
18	19	9
19	19	9
20	19	9
21	19	9
22	19	9
23	19	10
24	19	10
25	20	10
26	20	10
27	20	10
28	20	10
29	20	10
30	20	11
31	20	11

	Clearer (%)	Cloudier (%)
1	31	69
2	30	70
3	30	70
4	30	70
5	30	70
6	30	70
7	29	71
8	30	70
9	30	70
10	30	70
11	31	69
12	31	69
13	31	69
14	32	68
15	32	68
16	33	67
17	33	67
18	34	66
19	35	65
20	37	63
21	37	63
22	37	63
23	38	62
24	38	62
25	38	62
26	39	61
27	40	60
28	40	60
29	39	61
30	37	63
31	37	63

	Rain chance (%)	Snow chance (%)
1	56	2
2	57	1
3	57	1
4	58	1
5	58	1
6	58	1
7	58	1
8	58	1
9	58	1
10	57	1
11	57	1
12	57	1
13	57	1
14	56	0
15	56	0
16	56	0
17	55	0
18	54	0
19	54	0
20	53	0
21	52	0
22	52	0
23	51	0
24	51	0
25	51	0
26	51	0
27	51	0
28	51	0
29	52	0
30	53	0
31	54	0

	Dry (%)	Comfortable (%)	Humid (%)
1	99	1	0
2	98	2	0
3	98	2	0
4	98	2	0
5	97	3	0
6	97	3	0
7	97	3	0
8	96	4	0
9	96	4	0
10	96	4	0
11	95	5	0
12	95	5	0
13	95	5	0
14	95	5	0
15	94	6	0
16	94	6	0
17	93	7	0
18	92	8	0
19	92	8	0
20	91	9	0
21	90	10	0
22	88	11	1
23	87	12	1
24	85	14	1
25	84	15	1
26	83	16	1
27	81	17	2
28	79	19	2
29	77	20	3
30	76	21	3
31	74	22	4

	Avg high (°C)	Avg low (°C)
1	17	7
2	17	7
3	17	8
4	17	8
5	17	8
6	17	8
7	17	8
8	17	8
9	17	8
10	18	8
11	18	8
12	18	8
13	18	9
14	18	9
15	18	9
16	18	9
17	18	9
18	19	9
19	19	9
20	19	9
21	19	9
22	19	9
23	19	10
24	19	10
25	20	10
26	20	10
27	20	10
28	20	10
29	20	10
30	20	11
31	20	11

	Clearer (%)	Cloudier (%)
1	31	69
2	30	70
3	30	70
4	30	70
5	30	70
6	30	70
7	29	71
8	30	70
9	30	70
10	30	70
11	31	69
12	31	69
13	31	69
14	32	68
15	32	68
16	33	67
17	33	67
18	34	66
19	35	65
20	37	63
21	37	63
22	37	63
23	38	62
24	38	62
25	38	62
26	39	61
27	40	60
28	40	60
29	39	61
30	37	63
31	37	63

	Rain chance (%)	Snow chance (%)
1	56	2
2	57	1
3	57	1
4	58	1
5	58	1
6	58	1
7	58	1
8	58	1
9	58	1
10	57	1
11	57	1
12	57	1
13	57	1
14	56	0
15	56	0
16	56	0
17	55	0
18	54	0
19	54	0
20	53	0
21	52	0
22	52	0
23	51	0
24	51	0
25	51	0
26	51	0
27	51	0
28	51	0
29	52	0
30	53	0
31	54	0

	Dry (%)	Comfortable (%)	Humid (%)
1	99	1	0
2	98	2	0
3	98	2	0
4	98	2	0
5	97	3	0
6	97	3	0
7	97	3	0
8	96	4	0
9	96	4	0
10	96	4	0
11	95	5	0
12	95	5	0
13	95	5	0
14	95	5	0
15	94	6	0
16	94	6	0
17	93	7	0
18	92	8	0
19	92	8	0
20	91	9	0
21	90	10	0
22	88	11	1
23	87	12	1
24	85	14	1
25	84	15	1
26	83	16	1
27	81	17	2
28	79	19	2
29	77	20	3
30	76	21	3
31	74	22	4

	Avg high (°C)	Avg low (°C)
1	17	7
2	17	7
3	17	8
4	17	8
5	17	8
6	17	8
7	17	8
8	17	8
9	17	8
10	18	8
11	18	8
12	18	8
13	18	9
14	18	9
15	18	9
16	18	9
17	18	9
18	19	9
19	19	9
20	19	9
21	19	9
22	19	9
23	19	10
24	19	10
25	20	10
26	20	10
27	20	10
28	20	10
29	20	10
30	20	11
31	20	11

	Clearer (%)	Cloudier (%)
1	31	69
2	30	70
3	30	70
4	30	70
5	30	70
6	30	70
7	29	71
8	30	70
9	30	70
10	30	70
11	31	69
12	31	69
13	31	69
14	32	68
15	32	68
16	33	67
17	33	67
18	34	66
19	35	65
20	37	63
21	37	63
22	37	63
23	38	62
24	38	62
25	38	62
26	39	61
27	40	60
28	40	60
29	39	61
30	37	63
31	37	63

	Rain chance (%)	Snow chance (%)
1	56	2
2	57	1
3	57	1
4	58	1
5	58	1
6	58	1
7	58	1
8	58	1
9	58	1
10	57	1
11	57	1
12	57	1
13	57	1
14	56	0
15	56	0
16	56	0
17	55	0
18	54	0
19	54	0
20	53	0
21	52	0
22	52	0
23	51	0
24	51	0
25	51	0
26	51	0
27	51	0
28	51	0
29	52	0
30	53	0
31	54	0

	Dry (%)	Comfortable (%)	Humid (%)
1	99	1	0
2	98	2	0
3	98	2	0
4	98	2	0
5	97	3	0
6	97	3	0
7	97	3	0
8	96	4	0
9	96	4	0
10	96	4	0
11	95	5	0
12	95	5	0
13	95	5	0
14	95	5	0
15	94	6	0
16	94	6	0
17	93	7	0
18	92	8	0
19	92	8	0
20	91	9	0
21	90	10	0
22	88	11	1
23	87	12	1
24	85	14	1
25	84	15	1
26	83	16	1
27	81	17	2
28	79	19	2
29	77	20	3
30	76	21	3
31	74	22	4