Saint-Omer weather in May

In May, Saint-Omer sees average daytime highs of 17°C and overnight lows near 9°C, with 65 mm of rain across 11.3 wet days and about 15.2 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 18°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 30 min at the start of May to 15 h 54 min by month's end. Set against the rest of the year, May is Saint-Omer's 6th-clearest and 8th-windiest month. For the whole year in context, see Saint-Omer's year-round climate.

Daytime high
17°
5th warmest
Overnight low
8th coldest
Rainfall
65 mm
11.3 wet days
Daylight
15 h 18 min
5:09 AM – 8:25 PM
Cloud cover
67%
6th clearest
Wind
14 km/h
8th windiest
Solar energy
5.23 kWh/m²
Travel score
5.1
out of 10
Air quality
Good
PM10 19.4 µg/m³ · 2019

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 15°C in the first days to 18°C by the end.

A typical May day in Saint-Omer reaches about 17°C in the afternoon and slips back to 9°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 23°C. Set against its neighbours, May runs about 3°C warmer than April and about 3°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1158
2158
3158
4158
5168
6168
7168
8168
9168
10168
11168
12169
13169
14179
15179
16179
17179
18179
19179
20179
21179
221710
231810
241810
251810
261810
271810
281810
291810
301810
311810

How May really feels in Saint-Omer

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
0
heat index over the day's high
Days feeling ≤ C
0
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-Omer weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 621218.20.7
Feb / 5310.61.19.71.0
Mar10° / 5110.90.811.52.3
Apr14° / 5211.10.113.53.7
May17° / 6511.3015.25.1
Jun19° / 12°6310.3016.26.0
Jul22° / 14°5911015.86.4
Aug22° / 14°7111.2014.36.4
Sep19° / 12°5710.1012.45.8
Oct15° / 6512010.44.1
Nov10° / 6812.70.38.72.1
Dec / 7512.61.17.80.9

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 17% of May, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13466
23466
33367
43367
53367
63466
73466
83565
93565
103565
113565
123565
133664
143763
153763
163763
173763
183763
193664
203763
213763
223763
233664
243664
253664
263664
273664
283565
293565
303466
313466

Chance of precipitation in May

Any precipitation

Saint-Omer gets around 65 mm of rain over 11.3 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
239
339
438
538
638
737
837
937
1037
1137
1238
1338
1438
1538
1638
1738
1838
1938
2038
2138
2237
2337
2436
2536
2636
2736
2836
2936
3036
3136

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 92% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29820
39820
49730
59730
69640
79640
89640
99550
109550
119550
129460
139460
149460
159460
169460
179370
189370
199271
209271
219181
229181
239181
249091
2589101
2688102
2787112
2886122
2985132
3084142
3183152

Wind in May

Winds average 14 km/h in May.

Across May, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 30 min at the start of May to 15 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over May. Sunrise moves from 5:34 AM to 4:52 AM, and sunset from 8:02 PM to 8:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:348:02
214.55:328:04
314.65:318:05
414.65:298:07
514.75:278:08
614.75:258:10
714.85:238:12
814.95:228:13
914.95:208:15
1015.05:188:16
1115.05:178:18
1215.15:158:19
1315.15:148:21
1415.25:128:22
1515.25:118:24
1615.35:098:25
1715.35:088:27
1815.45:068:28
1915.45:058:30
2015.55:048:31
2115.55:028:32
2215.55:018:34
2315.65:008:35
2415.64:598:36
2515.74:588:38
2615.74:578:39
2715.74:558:40
2815.84:548:41
2915.84:548:43
3015.94:538:44
3115.94:528:45

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.23 kWh/m².

For context, solar energy here swings from a low near 0.68 kWh/m² to a high of 5.56 kWh/m² in June across the year — May's 5.23 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
14.8Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.1Bright
115.1Bright
125.1Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in May

Is May a good time to visit Saint-Omer?

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

5.1
Sightseeing
5th-best month of the year
1.1
Beach & pool
5th-best month of the year

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

What to pack for Saint-Omer in May

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

In May, Saint-Omer sees daytime highs around 17°C and nights near 9°C. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.

a warm layerrain gearsun protection

Sea temperature near Saint-Omer in May

The nearest coast averages about 12°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 43 km away) is warmest in August at about 18°C and coldest in February near 7°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan8Bracing
Feb7Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep18Cool
Oct15Cool
Nov13Bracing
Dec10Bracing

UV index in Saint-Omer in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — 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-Omer peaks around June 22 at about 6 (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 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 22UV 6Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul6High
Aug7High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Saint-Omer?

Saint-Omer sits at 50.7°N, 2.3°E, 10 m above sea level, in France. The nearest listed city is Hazebrouck, 20 km away.

Topography around Saint-Omer

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

Within 3 km, the terrain around Saint-Omer has only modest variations in elevation — a maximum elevation change of 85 m around an average of 18 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 206 m; within 80 km, significant variations in elevation — a maximum elevation change of 272 m.

The land around Saint-Omer is covered by trees (25%), artificial surfaces (25%) and grassland (24%) within 3 km, cropland (57%) within 16 km, and cropland (41%) and water (31%) within 80 km.

3 km
85 m
16 km
206 m
80 km
272 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Hazebrouck 20 km · Grande-Synthe 30 km · Coudekerque-Branche 32 km · Saint-Pol-sur-Mer 32 km · Dunkirk 33 km · Poperinge 35 km · Bruay-la-Buissière 36 km · Béthune 36 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 Saint-Omer (50.7483°, 2.2609°, elevation 10 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).