Ostend weather in September

In September, Ostend sees average daytime highs of 18°C and overnight lows near 14°C, with 78 mm of rain across 12 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 17°C by the end. The sky is clear or mostly clear about 21% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Ostend's 6th-clearest and 7th-windiest month. For the whole year in context, see Ostend's year-round climate.

Daytime high
18°
3rd warmest
Overnight low
14°
10th coldest
Rainfall
78 mm
12 wet days
Daylight
12 h 24 min
6:31 AM – 6:54 PM
Cloud cover
63%
6th clearest
Wind
20 km/h
7th windiest
Solar energy
3.28 kWh/m²
Travel score
5.4
out of 10

Ostend is city in Ostend municipality, Belgium.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 19°C in the first days to 17°C by the end.

A typical September day in Ostend reaches about 18°C in the afternoon and slips back to 14°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 21°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11915
21915
31915
41915
51915
61915
71915
81915
91815
101815
111815
121815
131814
141814
151814
161814
171814
181814
191814
201814
211714
221714
231714
241714
251713
261713
271713
281713
291713
301613

How September really feels in Ostend

Once humidity and wind are folded in, September 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

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

Ostend weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 7313.90.88.20.7
Feb / 6011.41.19.60.7
Mar / 5511.40.511.51.6
Apr11° / 4610.4013.52.8
May14° / 11°5710.9015.34.2
Jun17° / 14°6010.5016.35.4
Jul20° / 16°7012015.96.0
Aug20° / 16°8012014.46.0
Sep18° / 14°7812012.45.4
Oct15° / 11°9214010.43.8
Nov11° / 9515.40.28.72.1
Dec / 9314.90.77.71.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34456
44456
54357
64357
74357
84357
94258
104258
114159
124159
134159
144258
154258
164258
174357
184258
194258
204258
214159
224159
234060
244060
253961
263862
273763
283763
293466
303466

Chance of precipitation in September

Any precipitation

Ostend gets around 78 mm of rain over 12 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 46% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
140
240
340
440
540
640
740
840
940
1040
1140
1240
1340
1440
1540
1640
1740
1840
1940
2041
2141
2241
2342
2442
2543
2644
2744
2845
2946
3046

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 59% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14439161
24638160
34737160
44836150
54935150
65035150
75134150
85233150
95432140
105432140
115631130
125631130
135830120
145930110
156030100
16613090
17623080
18633070
19633070
20643060
21643150
22653140
23653140
24663130
25673120
26673120
27683020
28693010
29702910
30712810

Wind in September

Winds average 20 km/h in September.

Across September, daily wind ranges from about 20 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
120light breeze
220light breeze
320light breeze
420light breeze
520light breeze
620light breeze
720breezy
820breezy
920breezy
1020breezy
1120breezy
1220breezy
1320breezy
1420breezy
1520breezy
1620breezy
1720breezy
1820breezy
1920breezy
2020breezy
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620breezy
2721breezy
2821breezy
2921breezy
3021breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over September. Sunrise moves from 6:07 AM to 6:54 AM, and sunset from 7:29 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:077:29
213.36:087:27
313.26:107:25
413.26:127:22
513.16:137:20
613.06:157:18
713.06:167:15
812.96:187:13
912.96:207:11
1012.86:217:08
1112.76:237:06
1212.76:257:04
1312.66:267:01
1412.56:286:59
1512.56:296:57
1612.46:316:54
1712.36:336:52
1812.36:346:49
1912.26:366:47
2012.16:386:45
2112.16:396:42
2212.06:416:40
2311.96:436:38
2411.86:446:35
2511.86:466:33
2611.76:476:30
2711.66:496:28
2811.66:516:26
2911.56:526:23
3011.46:546:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.28 kWh/m².

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.72 kWh/m² in June across the year — September's 3.28 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.6Moderate
93.6Moderate
103.5Moderate
113.5Moderate
123.4Moderate
133.4Moderate
143.3Moderate
153.3Moderate
163.3Moderate
173.2Moderate
183.2Moderate
193.1Moderate
203.1Moderate
213.0Moderate
223.0Moderate
232.9Moderate
242.9Moderate
252.8Moderate
262.8Moderate
272.7Moderate
282.7Moderate
292.6Moderate
302.6Moderate
Planning a trip in September

Is September a good time to visit Ostend?

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

5.4
Sightseeing
3rd-best month of the year
1.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Ostend for sightseeing.

What to pack for Ostend in September

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

In September, Ostend sees daytime highs around 18°C and nights near 14°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Ostend in September

The nearest coast averages about 18°C in September — 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 19°C and coldest in February near 6°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
Jan7Bracing
Feb6Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug19Cool
Sep18Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Ostend in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ostend 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
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Ostend?

Ostend sits at 51.2°N, 2.9°E, 6 m above sea level, in Belgium. The nearest listed city is Middelkerke, 8.0 km away.

ZedelgemSint-AndriesBlankenbergeTorhoutBrugesDiksmuideOostkamp

Topography around Ostend

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

Within 3 km, the terrain around Ostend has only modest variations in elevation — a maximum elevation change of 25 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 49 m; within 80 km, significant variations in elevation — a maximum elevation change of 318 m.

The land around Ostend is covered by artificial surfaces (40%) and grassland (22%) within 3 km, water (43%), cropland (23%) and grassland (22%) within 16 km, and cropland (35%) and water (33%) within 80 km.

3 km
25 m
16 km
49 m
80 km
318 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Middelkerke 8.0 km · Zedelgem 17 km · Sint-Andries 18 km · Blankenberge 18 km · Torhout 21 km · Bruges 21 km · Diksmuide 21 km · Oostkamp 22 km

Belgium travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 81% of US
price level, 2025
GDP per capita
$60,750
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
5.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 608
Religion
Roman Catholic 57%nonbeliever/agnostic 20%atheist 9%Muslim 7%

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 Ostend (51.2155°, 2.927°, 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).