Calais weather in August

In August, Calais sees average daytime highs of 19°C and overnight lows near 16°C, with 65 mm of rain across 10 wet days and about 14.3 hours of daylight. It is the 1st-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 27% 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 Calais's 2nd-clearest and 11th-windiest month. For the whole year in context, see Calais's year-round climate.

Daytime high
19°
1st warmest
Overnight low
16°
12th coldest
Rainfall
65 mm
10 wet days
Daylight
14 h 24 min
5:46 AM – 8:07 PM
Cloud cover
58%
2nd clearest
Wind
20 km/h
11th windiest
Solar energy
4.73 kWh/m²
Travel score
6.2
out of 10

Calais is commune in Pas-de-Calais, France.

Air quality
Moderate
PM2.5 10.2 µg/m³ · 2019
Density
2,222/km²
people per km²

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 19°C through the month.

A typical August day in Calais reaches about 19°C in the afternoon and slips back to 16°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 22°C. Set against its neighbours, August runs on par with July and about 2°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11916
22016
32016
42016
52016
62016
72016
82016
92016
101916
111916
121916
131916
141916
151916
161916
171916
181916
191916
201916
211916
221916
231916
241916
251916
261916
271916
281916
291916
301916
311915

How August really feels in Calais

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.

Calais weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 7914.30.88.21.0
Feb / 6011.419.71.0
Mar / 5110.50.511.51.7
Apr11° / 459.3013.52.7
May14° / 10°519.8015.33.9
Jun16° / 13°498.7016.25.2
Jul19° / 15°519.6015.86.1
Aug19° / 16°6510014.36.2
Sep18° / 14°6811.2012.45.5
Oct15° / 12°9614.3010.43.9
Nov11° / 10116.40.28.72.3
Dec / 94150.77.81.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% 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 51%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35446
45347
55347
65248
75248
85248
95149
105149
115149
125050
135050
145050
155050
165050
175050
185050
194951
204852
214753
224753
234753
244753
254852
264852
274654
284654
294555
304555
314555

Chance of precipitation in August

Any precipitation

Calais gets around 65 mm of rain over 10 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 32% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
331
431
531
631
732
832
932
1032
1132
1232
1333
1433
1533
1633
1734
1834
1934
2033
2133
2233
2333
2432
2532
2632
2732
2832
2932
3031
3131

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 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11560250
21560250
31658251
41658251
51658251
61757251
71757251
81855252
91855252
101954252
112053252
122053252
132152252
142251252
152251252
162351242
172351242
182450242
192550242
202550242
212649231
222849231
232948221
243047221
253246211
263445201
273544201
283743191
293842190
304041180
314141180

Wind in August

Winds average 20 km/h in August.

Across August, daily wind ranges from about 19 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1520light breeze
1620light breeze
1720light breeze
1820light breeze
1920light breeze
2020light breeze
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620breezy
2721breezy
2821breezy
2921breezy
3021breezy
3121breezy

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 5:23 AM to 6:10 AM, and sunset from 8:34 PM to 7:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.25:238:34
215.15:248:33
315.15:268:31
415.05:278:30
515.05:298:28
614.95:308:26
714.95:328:24
814.85:338:23
914.85:358:21
1014.75:368:19
1114.75:388:17
1214.65:408:15
1314.55:418:13
1414.55:438:11
1514.45:448:09
1614.45:468:07
1714.35:478:05
1814.25:498:03
1914.25:518:01
2014.15:527:59
2114.15:547:57
2214.05:557:55
2313.95:577:53
2413.95:597:51
2513.86:007:49
2613.76:027:47
2713.76:037:44
2813.66:057:42
2913.66:077:40
3013.56:087:38
3113.46:107:35

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.73 kWh/m².

For context, solar energy here swings from a low near 0.68 kWh/m² to a high of 5.74 kWh/m² in June across the year — August's 4.73 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.6Bright
194.6Bright
204.5Bright
214.5Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.2Bright
274.2Bright
284.2Bright
294.1Bright
304.1Bright
314.0Bright
Planning a trip in August

Is August a good time to visit Calais?

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

6.2
Sightseeing
1st-best month of the year
2.8
Beach & pool
1st-best month of the year

August is a reasonable time to visit Calais for sightseeing.

What to pack for Calais in August

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

In August, Calais sees daytime highs around 19°C and nights near 16°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Calais 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 18 km away) is warmest in August at about 18°C and coldest in March near 8°C.

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

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun14Bracing
Jul16Cool
Aug18Cool
Sep17Cool
Oct16Cool
Nov13Bracing
Dec11Bracing

UV index in Calais 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 Calais 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 January 1 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 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul6High
Aug7High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Calais?

Calais sits at 51.0°N, 1.9°E, 6 m above sea level, in France. The nearest listed city is Boulogne-sur-Mer, 30 km away.

Topography around Calais

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

Within 3 km, the terrain around Calais has only modest variations in elevation — a maximum elevation change of 20 m around an average of 3 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 250 m; within 80 km, significant variations in elevation — a maximum elevation change of 290 m.

The land around Calais is covered by artificial surfaces (48%) and grassland (23%) within 3 km, water (45%) and cropland (30%) within 16 km, and water (47%) and cropland (30%) within 80 km.

3 km
20 m
16 km
250 m
80 km
290 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Boulogne-sur-Mer 30 km · Grande-Synthe 32 km · Outreau 33 km · Saint-Pol-sur-Mer 35 km · Saint-Omer 36 km · Dunkirk 38 km · Coudekerque-Branche 38 km · Dover 43 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 Calais (50.9519°, 1.8563°, elevation 6 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).