Santarém weather in September

In September, Santarém sees average daytime highs of 27°C and overnight lows near 16°C, with 33 mm of rain across 4.5 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 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 59% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Santarém's 4th-clearest and 8th-windiest month. For the whole year in context, see Santarém's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
33 mm
4.5 wet days
Daylight
12 h 18 min
6:21 AM – 6:37 PM
Cloud cover
36%
4th clearest
Wind
12 km/h
8th windiest
Solar energy
5.18 kWh/m²
Travel score
7.6
out of 10

Santarém is city seat of Santarém municipality.

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 29°C in the first days to 25°C by the end.

A typical September day in Santarém reaches about 27°C in the afternoon and slips back to 16°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 32°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12917
22917
32917
42917
52817
62816
72816
82816
92816
102816
112816
122716
132716
142716
152716
162716
172716
182716
192616
202616
212615
222615
232615
242615
252615
262515
272515
282515
292515
302515

Santarém 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
Jan14° / 688.99.64.3
Feb15° / 516.910.55.1
Mar18° / 598.111.76.3
Apr20° / 10°588.5136.6
May23° / 13°527.414.17.4
Jun27° / 15°122.714.78.1
Jul29° / 17°4114.57.3
Aug30° / 17°71.613.56.9
Sep27° / 16°334.512.37.6
Oct22° / 13°799.2116.9
Nov17° / 10°809.29.85.7
Dec15° / 778.89.34.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 59% 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 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28416
38317
48317
58119
68020
78020
87921
97822
107723
117624
127624
137624
147426
157426
167327
177327
187228
197228
207129
217129
227129
237129
247030
257030
266931
276832
286832
296733
306733

Chance of precipitation in September

Any precipitation

Santarém gets around 33 mm of rain over 4.5 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 15% and peaks near 20% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
17
27
37
48
58
69
79
810
910
1011
1112
1213
1314
1414
1515
1616
1717
1817
1918
2019
2119
2219
2320
2420
2520
2620
2720
2820
2920
3020

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 (%)
12449261
22549261
32548261
42648251
52647251
62747251
72847241
82847241
92846241
102946241
112946241
122946241
133045231
143045231
153145231
163145231
173245221
183245221
193344211
203444211
213444211
223543211
233543211
243642211
253742201
263841202
273940202
284039192
294138192
304237192

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min 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 78 minutes over September. Sunrise moves from 6:07 AM to 6:35 AM, and sunset from 7:01 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:077:01
212.96:087:00
312.86:096:58
412.86:106:57
512.76:116:55
612.76:126:53
712.66:136:52
812.66:146:50
912.66:156:48
1012.56:166:47
1112.56:176:45
1212.46:186:43
1312.46:196:42
1412.36:206:40
1512.36:216:38
1612.36:216:37
1712.26:226:35
1812.26:236:33
1912.16:246:32
2012.16:256:30
2112.06:266:28
2212.06:276:27
2311.96:286:25
2411.96:296:23
2511.96:306:21
2611.86:316:20
2711.86:326:18
2811.76:336:16
2911.76:346:15
3011.66:356:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.18 kWh/m².

For context, solar energy here swings from a low near 1.94 kWh/m² to a high of 7.57 kWh/m² in July across the year — September's 5.18 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.0Bright
35.9Bright
45.9Bright
55.8Bright
65.8Bright
75.7Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.4Bright
135.3Bright
145.3Bright
155.2Bright
165.1Bright
175.1Bright
185.0Bright
195.0Bright
204.9Bright
214.8Bright
224.8Bright
234.7Bright
244.7Bright
254.6Bright
264.6Bright
274.5Bright
284.5Bright
294.4Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Santarém?

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

7.6
Sightseeing
2nd-best month of the year
7.8
Beach & pool
4th-best month of the year

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

What to pack for Santarém in September

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

In September, Santarém sees daytime highs around 27°C and nights near 16°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Santarém in September

The nearest coast averages about 19°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 58 km away) is warmest in August at about 19°C and coldest in February near 14°C.

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

12°14°16°18°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May16Cool
Jun18Cool
Jul18Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec15Cool

UV index in Santarém in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santarém peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 highHighModerateLowJul 15UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr8Very high
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct5Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Santarém?

Santarém sits at 39.2°N, 8.7°W, 130 m above sea level, in Portugal. The nearest listed city is Azambuja, 24 km away.

Topography around Santarém

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

Within 3 km, the terrain around Santarém has only modest variations in elevation — a maximum elevation change of 115 m around an average of 33 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 167 m; within 80 km, large variations in elevation — a maximum elevation change of 674 m.

The land around Santarém is covered by grassland (29%), cropland (25%) and trees (22%) within 3 km, grassland (42%), cropland (28%) and trees (23%) within 16 km, and grassland (37%) and trees (36%) within 80 km.

3 km
115 m
16 km
167 m
80 km
674 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Azambuja 24 km · Monsanto 25 km · Torres Novas 30 km · Entroncamento 32 km · Vila Franca de Xira 41 km · Caldas da Rainha 43 km · Alcobaça 43 km · Tomar 47 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 Santarém (39.2338°, -8.6862°, elevation 130 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).