Mont-de-Marsan weather in August

In August, Mont-de-Marsan sees average daytime highs of 29°C and overnight lows near 16°C, with 51 mm of rain across 7.7 wet days and about 13.8 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 39% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 30 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Mont-de-Marsan's 1st-clearest and 12th-windiest month. For the whole year in context, see Mont-de-Marsan's year-round climate.

Daytime high
29°
1st warmest
Overnight low
16°
11th coldest
Rainfall
51 mm
7.7 wet days
Daylight
13 h 48 min
6:11 AM – 8:01 PM
Cloud cover
51%
1st clearest
Wind
8 km/h
12th windiest
Solar energy
5.38 kWh/m²
Travel score
6.1
out of 10
Air quality
Good
PM2.5 7.6 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

Day-to-day highs hold fairly steady near 29°C through the month.

A typical August day in Mont-de-Marsan reaches about 29°C in the afternoon and slips back to 16°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 35°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

10°20°30°40°151015202531
Avg high (°C)Avg low (°C)
12917
22917
32917
42917
52917
62917
72917
82917
92917
102917
112917
122917
132916
142916
152916
162916
172916
182916
192916
202916
212916
222916
232916
242816
252816
262816
272816
282816
292815
302815
312815

Mont-de-Marsan weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan11° / 66119.12.6
Feb13° / 529.510.23.4
Mar16° / 5610.711.65.1
Apr19° / 7412.213.25.7
May22° / 12°7211.914.56.3
Jun26° / 15°599.215.26.7
Jul29° / 16°457.814.96.2
Aug29° / 16°517.713.86.1
Sep25° / 14°508.312.37.0
Oct21° / 11°6210.210.86.3
Nov15° / 7411.59.54.2
Dec12° / 68118.82.8

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35545
45545
55545
65545
75545
85545
95545
105644
115644
125644
135644
145644
155743
165743
175743
185545
195545
205545
215545
225545
235545
245545
255545
265545
275545
285545
295545
305545
315644

Chance of precipitation in August

Any precipitation

Mont-de-Marsan gets around 51 mm of rain over 7.7 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 24% and peaks near 25% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
124
224
324
424
525
625
725
825
924
1024
1124
1224
1324
1424
1523
1623
1723
1823
1923
2023
2124
2224
2324
2424
2523
2623
2723
2823
2923
3023
3123

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
115333814
215333714
316333714
416343614
517343514
617343414
718353314
818353314
918353214
1018353214
1119353214
1219353214
1319353214
1419353214
1519353214
1619353214
1719343314
1819343314
1919333414
2019323514
2120313514
2221303514
2322293513
2423293513
2525283413
2627273412
2729273311
2830273211
2932273110
3033273010
313527299

Wind in August

Winds average 8 km/h in August, the calmest month.

Across August, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 30 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over August. Sunrise moves from 5:54 AM to 6:29 AM, and sunset from 8:22 PM to 7:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:548:22
214.45:558:21
314.45:568:19
414.35:578:18
514.35:598:17
614.36:008:16
714.26:018:14
814.26:028:13
914.16:038:11
1014.16:048:10
1114.16:058:09
1214.06:078:07
1314.06:088:06
1413.96:098:04
1513.96:108:03
1613.86:118:01
1713.86:127:59
1813.76:137:58
1913.76:157:56
2013.66:167:55
2113.66:177:53
2213.66:187:51
2313.56:197:50
2413.56:207:48
2513.46:227:46
2613.46:237:44
2713.36:247:43
2813.36:257:41
2913.26:267:39
3013.26:287:37
3113.16:297:35

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.38 kWh/m².

For context, solar energy here swings from a low near 1.32 kWh/m² to a high of 6.06 kWh/m² in June across the year — August's 5.38 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.3Bright
205.3Bright
215.3Bright
225.2Bright
235.2Bright
245.2Bright
255.1Bright
265.1Bright
275.1Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in August

Is August a good time to visit Mont-de-Marsan?

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

6.1
Sightseeing
6th-best month of the year
7.5
Beach & pool
1st-best month of the year

August is a reasonable time to visit Mont-de-Marsan for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Mont-de-Marsan in August

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

In August, Mont-de-Marsan sees daytime highs around 29°C and nights near 16°C. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

Sea temperature near Mont-de-Marsan in August

The nearest coast averages about 22°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 70 km away) is warmest in August at about 22°C and coldest in February near 12°C.

It's comfortable for a long swim from Jul 3 to Sep 23 — about 2.7 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May16Cool
Jun19Cool
Jul21Refreshing
Aug22Refreshing
Sep21Refreshing
Oct18Cool
Nov16Cool
Dec14Bracing

UV index in Mont-de-Marsan in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mont-de-Marsan peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr6High
May6High
Jun7Very high
Jul8Very high
Aug8Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Mont-de-Marsan?

Mont-de-Marsan sits at 43.9°N, 0.5°W, 51 m above sea level, in France. The nearest listed city is Dax, 49 km away.

Topography around Mont-de-Marsan

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mont-de-Marsan.

Within 3 km, the terrain around Mont-de-Marsan has only modest variations in elevation — a maximum elevation change of 73 m around an average of 61 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 128 m; within 80 km, large variations in elevation — a maximum elevation change of 637 m.

The land around Mont-de-Marsan is covered by trees (42%) and artificial surfaces (41%) within 3 km, trees (58%) and cropland (20%) within 16 km, and trees (49%), cropland (25%) and grassland (21%) within 80 km.

3 km
73 m
16 km
128 m
80 km
637 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Dax 49 km · Pau 65 km · Tarbes 86 km · Marmande 86 km · Bayonne 90 km · Auch 91 km · Anglet 93 km · Gujan-Mestras 95 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 Mont-de-Marsan (43.8902°, -0.4971°, elevation 51 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).