AI-generatedSão Martinho do Porto at a glance
- Best time
- Jun – Sep
- Warmest month
- Aug · 26°
- Warmest sea
- Aug · 18.6°
- Sunshine a year
- 2,900 h
- Rain a year
- 784 mm
- Climate
- Mediterranean
- Time zone
- UTC+0 / UTC+1
- Elevation
- 13 m
Climate in São Martinho do Porto
São Martinho do Porto has a Mediterranean climate with warm to hot, dry summers and mild, wetter winters. August is the warmest month with average highs of 26 °C, while January is the coolest at 15 °C. With around 2,900 hours of sunshine a year, São Martinho do Porto is sunny; July is the sunniest month with 11.1 hours a day.
Holiday weather through the year
Best time to visit São Martinho do Porto
The best time to visit São Martinho do Porto is from June to September. The sea stays too cool for a classic beach holiday: even in August it only reaches 18.6 °C. For sightseeing, day trips and hiking, conditions are most comfortable all year round except in November. The wettest month is November with 115 mm of precipitation.
São Martinho do Porto through the seasons
How the weather changes over the seasons, with averages for each.
São Martinho do Porto in spring
Mar – May
Poor
- 18–22 °C by day
- Sea 15 °C
- 8.8 h of sun a day
- 29 rainy days in all
São Martinho do Porto in summer
Jun – Aug
Good
- 24–26 °C by day
- Sea 18 °C
- 10.8 h of sun a day
- 7 rainy days in all
São Martinho do Porto in autumn
Sep – Nov
Fair
- 18–25 °C by day
- Sea 18 °C
- 6.9 h of sun a day
- 29 rainy days in all
São Martinho do Porto in winter
Dec – Feb
Poor
- 15–16 °C by day
- Sea 15 °C
- 5.2 h of sun a day
- 32 rainy days in all
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
All year except Nov
15–28 °C and not too much rain
Rainy months
Nov
Rainy season or more than 12 rainy days
Find your perfect month
Tell us what you like and we rate every month in São Martinho do Porto for you.
Your best months: July – August
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Fair
Best time to visit: June – September
Where to go in OctoberSea temperature in October
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 15°
- Midday, 13:00: about 22°
- Afternoon, 16:00: about 22°
- Evening, 20:00: about 19°
- Night, 23:00: about 17°
07:4518:59
Pleasant evenings; a light layer can help.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:28–08:21 · evening 18:23–19:16
- Blue hour
- Morning 07:18–07:28 · evening 19:16–19:26
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in São Martinho do Porto compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 24° at the start of the month to 20° at the end. The sea cools from 18° to 17°. The days get 1.2 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 24° | 20° |
| Night-time low | 15° | 13° |
| Sea | 18° | 17° |
| Daylight | 11.8 h | 10.6 h |
What is the weather like in São Martinho do Porto in October?
In October, São Martinho do Porto is warm: daytime highs average 23 °C, and nights cool down to about 15 °C. The sea averages 18.0 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 6.7 hours a day. Rain is frequent, with about 11 rainy days and 104 mm in total. All in all, October is a so-so month for a holiday in São Martinho do Porto.
More details for October
- Daylight
- 11 h 14 min07:45 – 18:59
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 23 km/haverage daily peakAll months
- Cloud cover
- 54 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Time zone
- UTC+1offset from UTC
How the score comes together
- Temperatureweight 35 %58 %
- Seaweight 25 %14 %
- Sunshineweight 20 %62 %
- Few rainy daysweight 20 %51 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Wetsuit for longer swims
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Compare two months in São Martinho do Porto
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
August has the better holiday weather in São Martinho do Porto: score 81 against 47. In August, days are 3 °C warmer than in October. The sea is 1 °C warmer in August. August has 9 fewer rainy days. The sun shines 4 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Holiday weather score | 47 | 81better |
| Daytime high | 23° | 26° |
| Night-time low | 15° | 17° |
| Sea | 18.0° | 18.6° |
| Sunshine | 6.7 h | 10.4 hbetter |
| Rainy days | 11 | 2better |
| Rainfall | 104 mm | 7 mmbetter |
| Muggy days | 1better | 3 |
Based on the climate averages 1996–2025.
São Martinho do Porto month by month
The typical weather for every month at a glance.
16January15° · Sea 15° · 5.1 h
In January, São Martinho do Porto is cool: daytime highs average 15 °C, and nights cool down to about 9 °C. The sea averages 14.6 °C – swimming is only for the hardy. Expect around 5.1 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 104 mm in total. All in all, January is not an ideal month for a holiday in São Martinho do Porto.
São Martinho do Porto in January23February16° · Sea 14° · 6.1 h
In February, São Martinho do Porto is mild: daytime highs average 16 °C, and nights cool down to about 9 °C. The sea averages 14.2 °C – swimming is only for the hardy. Expect around 6.1 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 70 mm in total. All in all, February is not an ideal month for a holiday in São Martinho do Porto.
São Martinho do Porto in February26March18° · Sea 14° · 7.6 h
In March, São Martinho do Porto is mild: daytime highs average 18 °C, and nights cool down to about 10 °C. The sea averages 14.3 °C – swimming is only for the hardy. The sun shines for around 7.6 hours a day. Rain is frequent, with about 11 rainy days and 83 mm in total. All in all, March is not an ideal month for a holiday in São Martinho do Porto.
São Martinho do Porto in March33April20° · Sea 15° · 8.8 h
In April, São Martinho do Porto is mild: daytime highs average 20 °C, and nights cool down to about 12 °C. The sea averages 15.2 °C – swimming is only for the hardy. The sun shines for around 8.8 hours a day. Rain is frequent, with about 11 rainy days and 78 mm in total. All in all, April is not an ideal month for a holiday in São Martinho do Porto.
São Martinho do Porto in April51May22° · Sea 16° · 10.0 h
In May, São Martinho do Porto is warm: daytime highs average 22 °C, and nights cool down to about 14 °C. The sea averages 16.3 °C – swimming is only for the hardy. With around 10.0 hours of sunshine a day, there is plenty of sun. Rain falls on about 8 days, adding up to 52 mm. All in all, May is a so-so month for a holiday in São Martinho do Porto.
São Martinho do Porto in May74June24° · Sea 18° · 10.8 h
In June, São Martinho do Porto is warm: daytime highs average 24 °C, and nights cool down to about 16 °C. The sea averages 17.8 °C – bracing, so a wetsuit helps for longer swims. With around 10.8 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 19 mm in total. All in all, June is a good month for a holiday in São Martinho do Porto.
São Martinho do Porto in June80July26° · Sea 18° · 11.1 h
In July, São Martinho do Porto is warm: daytime highs average 26 °C, and nights cool down to about 17 °C. The sea averages 18.3 °C – bracing, so a wetsuit helps for longer swims. With around 11.1 hours of sunshine a day, there is plenty of sun. It hardly ever rains. All in all, July is an excellent month for a holiday in São Martinho do Porto.
São Martinho do Porto in July81August26° · Sea 19° · 10.4 h
In August, São Martinho do Porto is warm: daytime highs average 26 °C, and nights cool down to about 17 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. With around 10.4 hours of sunshine a day, there is plenty of sun. It hardly ever rains. All in all, August is an excellent month for a holiday in São Martinho do Porto.
São Martinho do Porto in August78September25° · Sea 19° · 8.8 h
In September, São Martinho do Porto is warm: daytime highs average 25 °C, and nights cool down to about 16 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8.8 hours a day. Rain falls on about 5 days, adding up to 41 mm. All in all, September is a good month for a holiday in São Martinho do Porto.
São Martinho do Porto in September47October23° · Sea 18° · 6.7 h
In October, São Martinho do Porto is warm: daytime highs average 23 °C, and nights cool down to about 15 °C. The sea averages 18.0 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 6.7 hours a day. Rain is frequent, with about 11 rainy days and 104 mm in total. All in all, October is a so-so month for a holiday in São Martinho do Porto.
São Martinho do Porto in October16November18° · Sea 17° · 5.3 h
In November, São Martinho do Porto is mild: daytime highs average 18 °C, and nights cool down to about 12 °C. The sea averages 16.7 °C – swimming is only for the hardy. Expect around 5.3 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 115 mm in total. All in all, November is not an ideal month for a holiday in São Martinho do Porto.
São Martinho do Porto in November14December16° · Sea 15° · 4.4 h
In December, São Martinho do Porto is cool: daytime highs average 16 °C, and nights cool down to about 9 °C. The sea averages 15.3 °C – swimming is only for the hardy. Expect around 4.4 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 106 mm in total. All in all, December is not an ideal month for a holiday in São Martinho do Porto.
São Martinho do Porto in DecemberClimate in detail
Year & climate table
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in São Martinho do Porto
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cool 8–15°
- Pleasant 15–20°
PleasantOctober: nights around 15°. Ideal for sleeping, often with the window open. Muggy on about 1 day (dew point 18 °C or more).
The coolest nights are in January (9°), the warmest in August (17°). Nights are pleasant for sleeping (15 to 20 °C) from June to October.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 16 | 15° | 9° | 14.6° | 5.1 h | 12 | 104 |
| FebruaryFeb | 23 | 16° | 9° | 14.2° | 6.1 h | 9 | 70 |
| MarchMar | 26 | 18° | 10° | 14.3° | 7.6 h | 11 | 83 |
| AprilApr | 33 | 20° | 12° | 15.2° | 8.8 h | 11 | 78 |
| MayMay | 51 | 22° | 14° | 16.3° | 10.0 h | 8 | 52 |
| JuneJun | 74 | 24° | 16° | 17.8° | 10.8 h | 4 | 19 |
| JulyJul | 80 | 26° | 17° | 18.3° | 11.1 h | 2 | 6 |
| AugustAug | 81 | 26° | 17° | 18.6° | 10.4 h | 2 | 7 |
| SeptemberSep | 78 | 25° | 16° | 18.6° | 8.8 h | 5 | 41 |
| OctoberOct | 47 | 23° | 15° | 18.0° | 6.7 h | 11 | 104 |
| NovemberNov | 16 | 18° | 12° | 16.7° | 5.3 h | 12 | 115 |
| DecemberDec | 14 | 16° | 9° | 15.3° | 4.4 h | 12 | 106 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
39.51° N, 9.13° W · 13 m · Europe/Lisbon
Sea temperature
Sea temperature in São Martinho do Porto
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 16.9 – 19.2 °C
Swimming season: Always below 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in São Martinho do Porto ranges from 14.2 °C in February to 18.6 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea temperature varies from year to year: in August, eight out of ten years were between 17.7 and 19.8 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 14.6° | 13.9° | 15.4° | cold |
| FebruaryFeb | 14.2° | 13.2° | 14.9° | cold |
| MarchMar | 14.3° | 13.6° | 15.1° | cold |
| AprilApr | 15.2° | 14.2° | 16.4° | cold |
| MayMay | 16.3° | 15.4° | 17.2° | cold |
| JuneJun | 17.8° | 16.9° | 18.7° | fresh |
| JulyJul | 18.3° | 17.6° | 19.1° | fresh |
| AugustAug | 18.6° | 17.7° | 19.8° | fresh |
| SeptemberSep | 18.6° | 17.6° | 19.8° | fresh |
| OctoberOct | 18.0° | 16.9° | 19.2° | fresh |
| NovemberNov | 16.7° | 15.5° | 18.0° | cold |
| DecemberDec | 15.3° | 14.4° | 16.4° | cold |
Sunshine
Sunshine hours in São Martinho do Porto
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 6.7 of 11.2 hours of daylight in São Martinho do Porto, 60 % of the daylight hours.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
Rain
Rain in São Martinho do Porto: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, São Martinho do Porto has about 11 rainy days with 104 mm of rain in total.
UV index
UV index in São Martinho do Porto
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 4 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 10).
Minutes until sunburn in October
- Very fair skin
- about 30 min
- Fair skin
- about 40 min
- Light brown skin
- about 55 min
- Olive skin
- about 70 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind & clouds
Wind and clouds in São Martinho do Porto
How breezy and how cloudy São Martinho do Porto is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in São Martinho do Porto typically peaks at 23 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting, and here it is that strong all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 54 % of the sky over São Martinho do Porto: variable cloud, with about 6.7 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat & humidity
Heat and humidity in São Martinho do Porto
How often the day gets hot in São Martinho do Porto (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, São Martinho do Porto has about 1 hot day, with an average daytime high of 23 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Planning a trip to São Martinho do Porto
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
São Martinho do Porto in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
São Martinho do Porto has its best school-holiday weather during the summer holidays (score 81) and its weakest during the Christmas holidays (score 15).
- 31
Easter holidays
Mar – Apr
Poor
- 19 °C by day
- Sea 15 °C
- 8.4 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 56
May half-term
May – Jun
Fair
- 22 °C by day
- Sea 17 °C
- 10.2 h of sun a day
- 7 rainy days a month
Good for: Sightseeing & walks
- 81
Summer holidays
Jul – Aug
ExcellentBest holidays
- 26 °C by day
- Sea 18 °C
- 10.6 h of sun a day
- 2 rainy days a month
Good for: Sightseeing & walks
- 47
October half-term
Oct
Fair
- 23 °C by day
- Sea 18 °C
- 6.7 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 15
Christmas holidays
Dec – Jan
Poor
- 16 °C by day
- Sea 15 °C
- 4.8 h of sun a day
- 12 rainy days a month
Good for: Sightseeing & walks
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 2 h 20 min
- Distance
- 1,490 km
- Time zone
- UTC+1
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Good to know: Portugal
- Currency
- Euro (EUR)
- Language
- Portuguese
- Sockets
- Type C, F · 230 V
- Traffic
- Drives on the right
- Dialling code
- +351
- Emergency number
- 112
UK plugs need a travel adapter
Sources: GeoNames (CC BY 4.0) and Wikidata (CC0). Please check details before you travel.
Compare & alternatives
Compare with another place
São Martinho do Porto compared
Put São Martinho do Porto side by side with another destination.
São Martinho do Porto vs Nazaré
In October the holiday weather in São Martinho do Porto and Nazaré is about equally good (score 47 vs 43). During the day Nazaré is 1 °C cooler than São Martinho do Porto. The sea is about equally warm.
| in October | São Martinho do Porto | Nazaré |
|---|---|---|
| Holiday weather score | 47 | 43 |
| Daytime high | 23° | 22° |
| Sea | 18° | 18° |
| Sunshine | 7 h | 7 h |
| Rainy days | 11 | 11 |
| Best time | Jun – Sep | Jun – Sep |
Through the year
Best places in the country
Portugal in October: the best places
In October, São Martinho do Porto ranks 23 among the 31 nearest destinations in this country.
- Évora24°83
- 2Tomar24°82
- 3Sintra21°82
- 4Amadora22°19°82
- 5Lisbon22°19°82
- 6Castelo Branco22°81
- 7Torres Vedras22°80
- 8Santarém24°80
- 23São Martinho do PortoThis page23°18°47
Places nearby
Near São Martinho do Porto
Other destinations close by.
Places with a similar climate
Places with a climate like São Martinho do Porto
Destinations whose weather through the year is closest to São Martinho do Porto's – good alternatives.
Frequently asked questions about São Martinho do Porto
When is the best time to visit São Martinho do Porto?
The best time to visit São Martinho do Porto is from June to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in São Martinho do Porto?
The sea temperature in São Martinho do Porto ranges from 14.2 °C in February to 18.6 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in São Martinho do Porto in October?
Only if you don't mind cold water: in October the sea averages just 18.0 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in São Martinho do Porto?
August is the warmest month, with average highs of 26 °C and nights around 17 °C. January is the coolest month at 15 °C.
When does it rain most in São Martinho do Porto?
The wettest month is November with 115 mm of precipitation. The driest month is July with 6 mm.
How many hours of sunshine does São Martinho do Porto get?
São Martinho do Porto gets around 2,900 hours of sunshine a year. The sunniest month is July with 11.1 hours a day; in December there are 4.4 hours a day.
What time zone is São Martinho do Porto in?
São Martinho do Porto is on UTC+0 in January and UTC+1 in July.
How long is the flight from London to São Martinho do Porto?
A nonstop flight from London to São Martinho do Porto takes about 2 h 20 min, for a straight-line distance of about 1,490 km.
Which school holidays are best for São Martinho do Porto?
São Martinho do Porto has its best school-holiday weather during the summer holidays (score 81) and its weakest during the Christmas holidays (score 15). Holiday ratings (0–100): Easter holidays 31, May half-term 56, summer holidays 81, October half-term 47, Christmas holidays 15.