Gernika-Lumo weather in September

In September, Gernika-Lumo sees average daytime highs of 21°C and overnight lows near 15°C, with 70 mm of rain across 11.5 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 20°C by the end. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Gernika-Lumo's 2nd-clearest and 9th-windiest month. For the whole year in context, see Gernika-Lumo's year-round climate.

Daytime high
21°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
70 mm
11.5 wet days
Daylight
12 h 18 min
6:56 AM – 7:14 PM
Cloud cover
55%
2nd clearest
Wind
10 km/h
9th windiest
Solar energy
4.15 kWh/m²
Travel score
6.2
out of 10

Gernika-Lumo is capital of Gernika-Lumo Municipality, Spain.

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 22°C in the first days to 20°C by the end.

A typical September day in Gernika-Lumo reaches about 21°C in the afternoon and slips back to 15°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 25°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12216
22216
32216
42216
52215
62215
72215
82215
92215
102115
112115
122115
132115
142115
152115
162115
172115
182115
192114
202114
212114
222014
232014
242014
252014
262014
272014
282014
292014
302014

Gernika-Lumo weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan11° / 119150.99.22.4
Feb12° / 10713.61.410.22.6
Mar13° / 10313.50.511.63.5
Apr15° / 10515.40.113.23.8
May17° / 11°9014.5014.55.0
Jun20° / 14°7111.5015.16.0
Jul22° / 16°6210.6014.96.7
Aug23° / 16°6010.9013.86.8
Sep21° / 15°7011.5012.36.2
Oct18° / 12°10614010.85.4
Nov14° / 14515.50.19.53.5
Dec12° / 11414.60.58.82.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25446
35446
45446
55446
65446
75545
85545
95446
105446
115446
125446
135347
145347
155347
165248
175248
185149
195050
204951
214951
224951
234951
244852
254852
264654
274654
284555
294555
304357

Chance of precipitation in September

Any precipitation

Gernika-Lumo gets around 70 mm of rain over 11.5 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 39% and peaks near 44% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
435
535
635
736
836
936
1037
1137
1238
1339
1439
1540
1640
1741
1841
1941
2042
2142
2242
2342
2442
2543
2643
2743
2844
2944
3044

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 38% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
118383311
219383310
32039329
42139319
52239318
62339318
72439307
82538306
92638306
102738305
112837305
122937294
133037294
143137293
153237283
163337272
173437272
183538261
193738241
203739231
213839220
223939210
234040200
244140190
254140180
264240180
274440170
284539160
294739150
304838140

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 6:39 AM to 7:13 AM, and sunset from 7:42 PM to 6:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:397:42
213.06:407:40
312.96:417:38
412.96:437:36
512.86:447:34
612.86:457:33
712.76:467:31
812.76:477:29
912.66:487:27
1012.66:497:25
1112.56:517:23
1212.56:527:21
1312.46:537:19
1412.46:547:18
1512.36:557:16
1612.36:567:14
1712.26:577:12
1812.26:597:10
1912.17:007:08
2012.17:017:06
2112.07:027:04
2212.07:037:02
2311.97:047:01
2411.97:066:59
2511.87:076:57
2611.87:086:55
2711.77:096:53
2811.77:106:51
2911.67:116:49
3011.67:136:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 1.4 kWh/m² to a high of 5.85 kWh/m² in June across the year — September's 4.15 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.6Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.0Bright
184.0Bright
194.0Moderate
203.9Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Gernika-Lumo?

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

6.2
Sightseeing
3rd-best month of the year
3.8
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Gernika-Lumo for sightseeing.

What to pack for Gernika-Lumo in September

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

In September, Gernika-Lumo sees daytime highs around 21°C and nights near 15°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Gernika-Lumo in September

The nearest coast averages about 21°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 26 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 25 — about 2.8 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar13Bracing
Apr14Bracing
May16Cool
Jun19Cool
Jul21Refreshing
Aug22Refreshing
Sep21Refreshing
Oct18Cool
Nov16Cool
Dec14Bracing

UV index in Gernika-Lumo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gernika-Lumo peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 15UV 9Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb2Low
Mar5Moderate
Apr6High
May6High
Jun8Very high
Jul9Very high
Aug8Very high
Sep5High
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Gernika-Lumo?

Gernika-Lumo sits at 43.3°N, 2.7°W, 97 m above sea level, in Spain. The nearest listed city is Amorebieta, 12 km away.

Topography around Gernika-Lumo

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

Within 3 km, the terrain around Gernika-Lumo has significant variations in elevation — a maximum elevation change of 390 m around an average of 105 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,013 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,596 m.

The land around Gernika-Lumo is covered by trees (66%) and grassland (26%) within 3 km, trees (67%) within 16 km, and trees (44%) and water (32%) within 80 km.

3 km
390 m
16 km
1,013 m
80 km
1,596 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Amorebieta 12 km · Bermeo 12 km · Mungia 14 km · Galdakao 16 km · Durango 17 km · Basauri 18 km · Santutxu 20 km · Bilbao 20 km

Spain travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$38,627
2025
Happiness
6.5 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
3.9
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 540
Religion
Roman Catholic 58%atheist 16%agnostic 11%non-believer 11%

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 Gernika-Lumo (43.3167°, -2.6833°, elevation 97 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).