Monsanto weather in September

In September, Monsanto sees average daytime highs of 26°C and overnight lows near 15°C, with 45 mm of rain across 5.7 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 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 58% 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 Monsanto's 3rd-clearest and 11th-windiest month. For the whole year in context, see Monsanto's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
45 mm
5.7 wet days
Daylight
12 h 18 min
6:22 AM – 6:37 PM
Cloud cover
37%
3rd clearest
Wind
12 km/h
11th windiest
Solar energy
5.16 kWh/m²
Travel score
7.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 27°C in the first days to 24°C by the end.

A typical September day in Monsanto reaches about 26°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 31°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°35°151015202530
Avg high (°C)Avg low (°C)
12716
22716
32716
42716
52716
62716
72716
82716
92716
102715
112615
122615
132615
142615
152615
162615
172615
182515
192515
202515
212515
222515
232515
242515
252414
262414
272414
282414
292414
302414

Monsanto 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° / 8610.29.53.9
Feb15° / 658.110.44.7
Mar18° / 739.211.75.9
Apr19° / 10°8010.5136.1
May22° / 12°728.614.17.0
Jun25° / 14°203.914.78.1
Jul27° / 16°61.814.58.3
Aug28° / 16°102.513.57.8
Sep26° / 15°455.712.37.8
Oct22° / 13°9910.1116.6
Nov17° / 97119.85.2
Dec14° / 919.99.34.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 58% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 27%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18317
28317
38218
48119
58020
68020
77822
87822
97723
107525
117525
127426
137426
147327
157327
167228
177228
187129
197030
207030
216931
226931
236832
246832
256733
266733
276634
286634
296535
306535

Chance of precipitation in September

Any precipitation

Monsanto gets around 45 mm of rain over 5.7 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 18% and peaks near 24% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
110
211
311
411
512
612
712
813
914
1014
1115
1216
1317
1418
1519
1619
1720
1821
1922
2022
2123
2223
2324
2424
2524
2624
2724
2824
2924
3024

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 45% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12448271
22448271
32547271
42547271
52646261
62646261
72746261
82746261
92846251
102846251
112846251
122946241
132946241
142946241
153046231
163046231
173146220
183146220
193246210
203346210
213346200
223446200
233545200
243544200
253644200
263743191
273842191
284041191
294140181
304239181

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 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

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 7:02 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:077:02
212.96:087:00
312.86:096:59
412.86:106:57
512.76:116:55
612.76:126:54
712.66:136:52
812.66:146:50
912.66:156:49
1012.56:166:47
1112.56:176:45
1212.46:186:44
1312.46:196:42
1412.36:206:40
1512.36:216:38
1612.36:226:37
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
2511.96:306:22
2611.86:316:20
2711.86:326:18
2811.76:336:17
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 5.16 kWh/m².

For context, solar energy here swings from a low near 1.93 kWh/m² to a high of 7.53 kWh/m² in July across the year — September's 5.16 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.0Bright
35.9Bright
45.8Bright
55.8Bright
65.7Bright
75.7Bright
85.6Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.3Bright
145.2Bright
155.2Bright
165.1Bright
175.0Bright
185.0Bright
194.9Bright
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

Hazard calendar for Monsanto

In seasonPeak

In September, Monsanto sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Monsanto's rainy season runs September–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 Monsanto?

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

7.8
Sightseeing
3rd-best month of the year
7.3
Beach & pool
4th-best month of the year

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

What to pack for Monsanto in September

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

In September, Monsanto sees daytime highs around 26°C and nights near 15°C. Worth packing: light clothes and sun protection. About 6 days see rain.

light clothessun protection

Sea temperature near Monsanto 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 40 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 Monsanto 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 Monsanto peaks around July 14 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 14UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr7Very high
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct5Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Monsanto?

Monsanto sits at 39.5°N, 8.7°W, 143 m above sea level, in Portugal. The nearest listed city is Torres Novas, 15 km away.

Topography around Monsanto

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

Within 3 km, the terrain around Monsanto has significant variations in elevation — a maximum elevation change of 312 m around an average of 152 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 668 m; within 80 km, large variations in elevation — a maximum elevation change of 1,078 m.

The land around Monsanto is covered by trees (57%) and grassland (29%) within 3 km, trees (45%) and grassland (39%) within 16 km, and trees (42%) and grassland (29%) within 80 km.

3 km
312 m
16 km
668 m
80 km
1,078 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Torres Novas 15 km · Entroncamento 21 km · Alcobaça 25 km · Santarém 25 km · Tomar 30 km · Leiria 32 km · Marinha Grande 37 km · Caldas da Rainha 37 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 Monsanto (39.462°, -8.7118°, elevation 143 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).