Saint-Omer weather in August

In August, Saint-Omer sees average daytime highs of 22°C and overnight lows near 14°C, with 71 mm of rain across 11.2 wet days and about 14.3 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 20°C by the end. The sky is clear or mostly clear about 19% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 15 h 12 min at the start of August to 13 h 24 min by month's end. Set against the rest of the year, August is Saint-Omer's 2nd-clearest and 12th-windiest month. For the whole year in context, see Saint-Omer's year-round climate.

Daytime high
22°
1st warmest
Overnight low
14°
12th coldest
Rainfall
71 mm
11.2 wet days
Daylight
14 h 18 min
5:45 AM – 8:05 PM
Cloud cover
63%
2nd clearest
Wind
13 km/h
12th windiest
Solar energy
4.59 kWh/m²
Travel score
6.4
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 August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 20°C by the end.

A typical August day in Saint-Omer reaches about 22°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 27°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12314
22314
32314
42314
52314
62314
72314
82214
92214
102214
112214
122214
132214
142214
152214
162214
172214
182214
192214
202214
212114
222114
232114
242114
252113
262113
272113
282113
292113
302013
312013

How August really feels in Saint-Omer

Once humidity and wind are folded in, August 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

August 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 August compares with the rest of the year at a glance. August is the 1st-warmest and 2nd-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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 22% of August, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14654
24654
34654
44555
54555
64357
74357
84357
94357
104258
114258
124258
134258
144159
154159
164159
174060
184060
194060
204060
214060
224060
233961
243961
253961
263862
273862
283862
293763
303763
313763

Chance of precipitation in August

Any precipitation

Saint-Omer gets around 71 mm of rain over 11.2 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
236
336
436
537
637
737
837
937
1038
1138
1238
1338
1438
1538
1638
1738
1837
1937
2037
2136
2235
2335
2434
2534
2633
2732
2832
2931
3031
3130

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 47% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13152161
23152161
33152161
43152161
53152152
63251152
73251152
83251152
93252142
103252142
113351142
123350152
133350152
143450152
153449152
163549152
173549152
183648142
193648142
203747141
213847141
224046131
234145131
244344131
254542121
264641121
274840111
284939111
295038111
305337100
315436100

Wind in August

Winds average 13 km/h in August, the calmest month.

Across August, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light 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 August

DaylightNight

Daylight runs from about 15 h 12 min at the start of August to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over August. Sunrise moves from 5:22 AM to 6:08 AM, and sunset from 8:32 PM to 7:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.25:228:32
215.15:238:31
315.15:258:29
415.05:268:27
515.05:288:26
614.95:298:24
714.95:318:22
814.85:328:20
914.75:348:19
1014.75:358:17
1114.65:378:15
1214.65:398:13
1314.55:408:11
1414.55:428:09
1514.45:438:07
1614.35:458:05
1714.35:468:03
1814.25:488:01
1914.25:497:59
2014.15:517:57
2114.05:537:55
2214.05:547:53
2313.95:567:51
2413.95:577:49
2513.85:597:47
2613.76:017:45
2713.76:027:42
2813.66:047:40
2913.56:057:38
3013.56:077:36
3113.46:087:34

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.59 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 — August's 4.59 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.1Bright
55.1Bright
65.0Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.3Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.0Bright
294.0Moderate
303.9Moderate
313.9Moderate
Planning a trip in August

Is August a good time to visit Saint-Omer?

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

6.4
Sightseeing
1st-best month of the year
4.3
Beach & pool
2nd-best month of the year

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

What to pack for Saint-Omer in August

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

In August, Saint-Omer sees daytime highs around 22°C and nights near 14°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Saint-Omer in August

The nearest coast averages about 18°C in August — 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 August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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-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
August 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).