Bomfim weather in September

In September, Bomfim sees average daytime highs of 23°C and overnight lows near 16°C, with 64 mm of rain across 6.6 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 22°C by the end. The sky is clear or mostly clear about 51% 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 Bomfim's 3rd-clearest and 12th-windiest month. For the whole year in context, see Bomfim's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
64 mm
6.6 wet days
Daylight
12 h 18 min
6:21 AM – 6:37 PM
Cloud cover
41%
3rd clearest
Wind
10 km/h
12th windiest
Solar energy
4.9 kWh/m²
Travel score
7.7
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 25°C in the first days to 22°C by the end.

A typical September day in Bomfim reaches about 23°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 28°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12517
22517
32517
42517
52517
62517
72517
82417
92416
102416
112416
122416
132416
142416
152416
162316
172316
182316
192316
202315
212315
222315
232315
242215
252215
262215
272215
282215
292215
302215

Bomfim weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan13° / 15012.29.43.3
Feb14° / 1039.510.44.0
Mar16° / 12110.211.75.1
Apr17° / 10°12111.813.15.5
May20° / 13°10111.214.36.3
Jun23° / 15°406.314.97.6
Jul25° / 17°23414.78.4
Aug26° / 17°304.513.68.2
Sep23° / 16°646.612.37.7
Oct20° / 13°16612.710.96.0
Nov16° / 10°16312.99.74.5
Dec13° / 16712.49.13.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 32%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17723
27723
37624
47525
57525
67525
77426
87327
97327
107129
117129
127030
137030
146931
156832
166832
176733
186535
196535
206436
216436
226337
236238
246238
256139
266139
276040
286040
295941
305941

Chance of precipitation in September

Any precipitation

Bomfim gets around 64 mm of rain over 6.6 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 23% and peaks near 29% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
117
217
318
418
518
618
718
818
919
1019
1120
1221
1321
1422
1522
1623
1723
1824
1924
2025
2126
2226
2326
2427
2527
2628
2728
2828
2928
3029

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 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11238473
21338462
31339452
41439452
51440442
61540432
71541421
81642411
91642411
101643401
111743392
121743382
131744371
141845361
151845351
161946341
171946331
182047321
192147311
202248301
212248291
222348281
232448271
242449270
252549260
262648250
272748250
282847240
293047230
303146230

Wind in September

Winds average 10 km/h in September, the calmest month.

Across September, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 6:05 AM to 6:35 AM, and sunset from 7:03 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:057:03
212.96:067:01
312.96:077:00
412.86:086:58
512.86:096:56
612.76:106:54
712.76:116:53
812.66:126:51
912.66:136:49
1012.66:146:47
1112.56:156:46
1212.56:166:44
1312.46:176:42
1412.46:196:40
1512.36:206:39
1612.36:216:37
1712.26:226:35
1812.26:236:33
1912.16:246:31
2012.16:256:30
2112.06:266:28
2212.06:276:26
2311.96:286:24
2411.96:296:23
2511.86:306:21
2611.86:316:19
2711.86:326:17
2811.76:336:16
2911.76:346:14
3011.66:356:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.9 kWh/m².

For context, solar energy here swings from a low near 1.65 kWh/m² to a high of 7.29 kWh/m² in July across the year — September's 4.9 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.6Bright
45.6Bright
55.5Bright
65.5Bright
75.4Bright
85.3Bright
95.3Bright
105.2Bright
115.2Bright
125.1Bright
135.0Bright
145.0Bright
154.9Bright
164.8Bright
174.8Bright
184.7Bright
194.7Bright
204.6Bright
214.6Bright
224.5Bright
234.5Bright
244.4Bright
254.3Bright
264.3Bright
274.3Bright
284.2Bright
294.2Bright
304.1Bright
Planning a trip in September

Hazard calendar for Bomfim

In seasonPeak

None of Bomfim's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Bomfim's rainy season runs October–May, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Bomfim?

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

7.7
Sightseeing
3rd-best month of the year
6.1
Beach & pool
3rd-best month of the year

September is one of the better times to visit Bomfim for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Bomfim in September

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

In September, Bomfim sees daytime highs around 23°C and nights near 16°C. Worth packing: light clothes and sun protection. About 7 days see rain.

light clothessun protection

Sea temperature near Bomfim in September

The nearest coast averages about 17°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in September at about 17°C and coldest in February near 13°C.

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

12°14°16°18°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr14Bracing
May16Cool
Jun17Cool
Jul17Cool
Aug17Cool
Sep17Cool
Oct17Cool
Nov16Cool
Dec14Bracing

UV index in Bomfim 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 Bomfim peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 23UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep5High
Oct5Moderate
Nov2Moderate
Dec2Low

Air quality in Bomfim in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Bomfim is worst in August — around 25 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (November, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodAug 2425 µg/m³Nov 237 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar14Moderate
Apr12Moderate
May8Good
Jun9Good
Jul9Good
Aug25Moderate
Sep24Moderate
Oct18Moderate
Nov7Good
Dec7Good
Location & terrain

Where is Bomfim?

Bomfim sits at 41.2°N, 8.6°W, 85 m above sea level, in Portugal. The nearest listed city is Campanhã, 1.0 km away.

Topography around Bomfim

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

Within 3 km, the terrain around Bomfim has only modest variations in elevation — a maximum elevation change of 161 m around an average of 85 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 406 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,416 m.

The land around Bomfim is covered by artificial surfaces (64%) and trees (22%) within 3 km, trees (36%), artificial surfaces (27%) and water (20%) within 16 km, and trees (42%), water (25%) and grassland (24%) within 80 km.

3 km
161 m
16 km
406 m
80 km
1,416 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Campanhã 1.0 km · Porto 2.0 km · Paranhos 2.0 km · Oliveira do Douro 3.0 km · Rio Tinto 4.0 km · Vila Nova de Gaia 4.0 km · São Mamede de Infesta 5.0 km · Santo Ovídio 5.0 km

Portugal travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E / F
230 V · 50 Hz
Prices
≈ 60% of US
price level, 2025
GDP per capita
$32,082
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
95%
of population, 2024
Homicide rate
0.7
per 100k, 2022
Road deaths
8.2
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 612
Religion
Catholic 68%not applicable 13%no religion 12%no response 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 Bomfim (41.1542°, -8.5869°, elevation 85 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).