AI-generatedOeiras at a glance
- Best time
- Jun – Sep
- Warmest month
- Aug · 28°
- Warmest sea
- Sep · 18.8°
- Sunshine a year
- 2,920 h
- Rain a year
- 565 mm
- Climate
- Mediterranean
- Time zone
- UTC+0 / UTC+1
- Elevation
- 36 m
Climate in Oeiras
Oeiras has a Mediterranean climate with warm to hot, dry summers and mild, wetter winters. August is the warmest month with average highs of 28 °C, while January is the coolest at 16 °C. With around 2,920 hours of sunshine a year, Oeiras is sunny; July is the sunniest month with 11.3 hours a day.
Holiday weather through the year
Best time to visit Oeiras
The best time to visit Oeiras is from June to September. The sea stays too cool for a classic beach holiday: even in September it only reaches 18.8 °C. For sightseeing, day trips and hiking, the weather is pleasant all year round. The wettest month is November with 85 mm of precipitation.
Oeiras through the seasons
How the weather changes over the seasons, with averages for each.
Oeiras in spring
Mar – May
Fair
- 18–22 °C by day
- Sea 16 °C
- 8.9 h of sun a day
- 24 rainy days in all
Oeiras in summer
Jun – Aug
Good
- 25–28 °C by day
- Sea 18 °C
- 11.1 h of sun a day
- 4 rainy days in all
Oeiras in autumn
Sep – Nov
Fair
- 18–26 °C by day
- Sea 18 °C
- 7.0 h of sun a day
- 24 rainy days in all
Oeiras in winter
Dec – Feb
Poor
- 16 °C by day
- Sea 15 °C
- 5.0 h of sun a day
- 26 rainy days in all
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
All year
15–28 °C and not too much rain
Find your perfect month
Tell us what you like and we rate every month in Oeiras for you.
Your best months: July – September
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 16°
- Midday, 13:00: about 22°
- Afternoon, 16:00: about 23°
- Evening, 20:00: about 20°
- Night, 23:00: about 18°
07:4519:01
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 07:29–08:21 · evening 18:25–19:17
- Blue hour
- Morning 07:18–07:29 · evening 19:17–19:27
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 Oeiras 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 21° at the end. The sea cools from 19° to 18°. The days get 1.2 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 24° | 21° |
| Night-time low | 16° | 14° |
| Sea | 19° | 18° |
| Daylight | 11.8 h | 10.7 h |
What is the weather like in Oeiras in October?
In October, Oeiras is warm: daytime highs average 23 °C, and nights cool down to about 15 °C. The sea averages 18.5 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 6.7 hours a day. Rain is frequent, with about 9 rainy days and 75 mm in total. All in all, October is a so-so month for a holiday in Oeiras.
More details for October
- Daylight
- 11 h 16 min07:45 – 19:01
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 2 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 51 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Time zone
- UTC+1offset from UTC
How the score comes together
- Temperatureweight 35 %65 %
- Seaweight 25 %21 %
- Sunshineweight 20 %62 %
- Few rainy daysweight 20 %64 %
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 Oeiras
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 Oeiras: score 81 against 53. In August, days are 5 °C warmer than in October. The sea is about as warm in both months. August has 8 fewer rainy days. The sun shines 4 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Holiday weather score | 53 | 81better |
| Daytime high | 23° | 28° |
| Night-time low | 15° | 18° |
| Sea | 18.5° | 18.6° |
| Sunshine | 6.7 h | 10.8 hbetter |
| Rainy days | 9 | 1better |
| Rainfall | 75 mm | 4 mmbetter |
| Muggy days | 2better | 3 |
Based on the climate averages 1996–2025.
Oeiras month by month
The typical weather for every month at a glance.
19January16° · Sea 15° · 4.9 h
In January, Oeiras is cool: daytime highs average 16 °C, and nights cool down to about 9 °C. The sea averages 15.4 °C – swimming is only for the hardy. Expect around 4.9 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 71 mm in total. All in all, January is not an ideal month for a holiday in Oeiras.
Oeiras in January25February16° · Sea 15° · 6.0 h
In February, Oeiras is mild: daytime highs average 16 °C, and nights cool down to about 10 °C. The sea averages 14.8 °C – swimming is only for the hardy. Expect around 6.0 hours of sunshine a day. Rain falls on about 7 days, adding up to 52 mm. All in all, February is not an ideal month for a holiday in Oeiras.
Oeiras in February28March18° · Sea 15° · 7.6 h
In March, Oeiras is mild: daytime highs average 18 °C, and nights cool down to about 11 °C. The sea averages 14.9 °C – swimming is only for the hardy. The sun shines for around 7.6 hours a day. Rain is frequent, with about 9 rainy days and 62 mm in total. All in all, March is not an ideal month for a holiday in Oeiras.
Oeiras in March38April20° · Sea 16° · 8.9 h
In April, Oeiras is mild: daytime highs average 20 °C, and nights cool down to about 12 °C. The sea averages 15.7 °C – swimming is only for the hardy. The sun shines for around 8.9 hours a day. Rain falls on about 9 days, adding up to 52 mm. All in all, April is not an ideal month for a holiday in Oeiras.
Oeiras in April58May22° · Sea 17° · 10.1 h
In May, Oeiras is warm: daytime highs average 22 °C, and nights cool down to about 14 °C. The sea averages 16.5 °C – swimming is only for the hardy. With around 10.1 hours of sunshine a day, there is plenty of sun. Rain falls on about 6 days, adding up to 38 mm. All in all, May is a so-so month for a holiday in Oeiras.
Oeiras in May78June25° · Sea 18° · 11.2 h
In June, Oeiras is warm: daytime highs average 25 °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 11.2 hours of sunshine a day, there is plenty of sun. Rain is rare: about 2 days bring 11 mm in total. All in all, June is a good month for a holiday in Oeiras.
Oeiras in June79July27° · Sea 18° · 11.3 h
In July, Oeiras is hot: daytime highs average 27 °C, and nights cool down to about 17 °C. The sea averages 18.2 °C – bracing, so a wetsuit helps for longer swims. With around 11.3 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 5 days the thermometer climbs to 30 °C or more. All in all, July is a good month for a holiday in Oeiras.
Oeiras in July81August28° · Sea 19° · 10.8 h
In August, Oeiras is hot: daytime highs average 28 °C, and nights cool down to about 18 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. With around 10.8 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 7 days the thermometer climbs to 30 °C or more. All in all, August is an excellent month for a holiday in Oeiras.
Oeiras in August81September26° · Sea 19° · 9.0 h
In September, Oeiras is warm: daytime highs average 26 °C, and nights cool down to about 17 °C. The sea averages 18.8 °C – bracing, so a wetsuit helps for longer swims. With around 9.0 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 31 mm in total. All in all, September is an excellent month for a holiday in Oeiras.
Oeiras in September53October23° · Sea 19° · 6.7 h
In October, Oeiras is warm: daytime highs average 23 °C, and nights cool down to about 15 °C. The sea averages 18.5 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 6.7 hours a day. Rain is frequent, with about 9 rainy days and 75 mm in total. All in all, October is a so-so month for a holiday in Oeiras.
Oeiras in October20November18° · Sea 17° · 5.2 h
In November, Oeiras is mild: daytime highs average 18 °C, and nights cool down to about 12 °C. The sea averages 17.3 °C – bracing, so a wetsuit helps for longer swims. Expect around 5.2 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 85 mm in total. All in all, November is not an ideal month for a holiday in Oeiras.
Oeiras in November16December16° · Sea 16° · 4.2 h
In December, Oeiras is mild: daytime highs average 16 °C, and nights cool down to about 10 °C. The sea averages 16.1 °C – swimming is only for the hardy. Expect around 4.2 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 83 mm in total. All in all, December is not an ideal month for a holiday in Oeiras.
Oeiras in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Oeiras
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 2 days (dew point 18 °C or more).
The coolest nights are in January (9°), the warmest in August (18°). 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 | 19 | 16° | 9° | 15.4° | 4.9 h | 9 | 71 |
| FebruaryFeb | 25 | 16° | 10° | 14.8° | 6.0 h | 7 | 52 |
| MarchMar | 28 | 18° | 11° | 14.9° | 7.6 h | 9 | 62 |
| AprilApr | 38 | 20° | 12° | 15.7° | 8.9 h | 9 | 52 |
| MayMay | 58 | 22° | 14° | 16.5° | 10.1 h | 6 | 38 |
| JuneJun | 78 | 25° | 16° | 17.8° | 11.2 h | 2 | 11 |
| JulyJul | 79 | 27° | 17° | 18.2° | 11.3 h | 1 | 2 |
| AugustAug | 81 | 28° | 18° | 18.6° | 10.8 h | 1 | 4 |
| SeptemberSep | 81 | 26° | 17° | 18.8° | 9.0 h | 4 | 31 |
| OctoberOct | 53 | 23° | 15° | 18.5° | 6.7 h | 9 | 75 |
| NovemberNov | 20 | 18° | 12° | 17.3° | 5.2 h | 10 | 85 |
| DecemberDec | 16 | 16° | 10° | 16.1° | 4.2 h | 10 | 83 |
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
38.69° N, 9.31° W · 36 m · Europe/Lisbon
Sea temperature in Oeiras
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 17.3 – 19.5 °C
Swimming season: Always below 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Oeiras ranges from 14.8 °C in February to 18.8 °C in September. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea warms up slowly: it is warmest in September, while the air already peaks in August. The sea temperature varies from year to year: in September, eight out of ten years were between 18.0 and 19.7 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 15.4° | 14.8° | 16.2° | cold |
| FebruaryFeb | 14.8° | 13.9° | 15.5° | cold |
| MarchMar | 14.9° | 14.1° | 15.5° | cold |
| AprilApr | 15.7° | 14.9° | 16.8° | cold |
| MayMay | 16.5° | 15.5° | 17.4° | cold |
| JuneJun | 17.8° | 17.1° | 18.6° | fresh |
| JulyJul | 18.2° | 17.7° | 18.9° | fresh |
| AugustAug | 18.6° | 17.8° | 19.6° | fresh |
| SeptemberSep | 18.8° | 18.0° | 19.7° | fresh |
| OctoberOct | 18.5° | 17.3° | 19.5° | fresh |
| NovemberNov | 17.3° | 16.1° | 18.4° | fresh |
| DecemberDec | 16.1° | 15.4° | 16.8° | cold |
Sunshine hours in Oeiras
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 11.3 hours of daylight in Oeiras, 59 % 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 in Oeiras: 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, Oeiras has about 9 rainy days with 75 mm of rain in total.
UV index in Oeiras
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 and clouds in Oeiras
How breezy and how cloudy Oeiras 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 Oeiras typically peaks at 22 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 51 % of the sky over Oeiras: 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 and humidity in Oeiras
How often the day gets hot in Oeiras (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, Oeiras 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 Oeiras
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Oeiras 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.
Oeiras has its best school-holiday weather during the summer holidays (score 80) and its weakest during the Christmas holidays (score 18).
- 35
Easter holidays
Mar – Apr
Poor
- 19 °C by day
- Sea 15 °C
- 8.5 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
- 62
May half-term
May – Jun
Good
- 23 °C by day
- Sea 17 °C
- 10.3 h of sun a day
- 5 rainy days a month
Good for: Sightseeing & walks
- 80
Summer holidays
Jul – Aug
ExcellentBest holidays
- 28 °C by day
- Sea 18 °C
- 11.0 h of sun a day
- 1 rainy day a month
Good for: Sightseeing & walks
- 53
October half-term
Oct
Fair
- 23 °C by day
- Sea 19 °C
- 6.7 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
- 18
Christmas holidays
Dec – Jan
Poor
- 16 °C by day
- Sea 16 °C
- 4.6 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 2 h 25 min
- Distance
- 1,580 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.
Compare & alternatives
Oeiras compared
Put Oeiras side by side with another destination.
Oeiras vs Cascais
In October the holiday weather in Oeiras and Cascais is about equally good (score 53 vs 53). During the day it is about as warm in Cascais as in Oeiras. The sea is about equally warm.
| in October | Oeiras | Cascais |
|---|---|---|
| Holiday weather score | 53 | 53 |
| Daytime high | 23° | 23° |
| Sea | 19° | 19° |
| Sunshine | 7 h | 7 h |
| Rainy days | 9 | 9 |
| Best time | Jun – Sep | Jun – Sep |
Through the year
Portugal in October: the best places
In October, Oeiras ranks 21 among the 31 nearest destinations in this country.
- Silves25°86
- 2Beja24°84
- 3Évora24°83
- 4Amadora22°19°82
- 5Sintra21°82
- 6Lisbon22°19°82
- 7Tomar24°82
- 8Mafra21°80
- 21OeirasThis page23°19°53
Near Oeiras
Other destinations close by.
Places with a climate like Oeiras
Destinations whose weather through the year is closest to Oeiras's – good alternatives.
Frequently asked questions about Oeiras
When is the best time to visit Oeiras?
The best time to visit Oeiras 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 Oeiras?
The sea temperature in Oeiras ranges from 14.8 °C in February to 18.8 °C in September. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Oeiras in October?
Only if you don't mind cold water: in October the sea averages just 18.5 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Oeiras?
August is the warmest month, with average highs of 28 °C and nights around 18 °C. January is the coolest month at 16 °C.
When does it rain most in Oeiras?
The wettest month is November with 85 mm of precipitation. The driest month is July with 2 mm.
How many hours of sunshine does Oeiras get?
Oeiras gets around 2,920 hours of sunshine a year. The sunniest month is July with 11.3 hours a day; in December there are 4.2 hours a day.
What time zone is Oeiras in?
Oeiras is on UTC+0 in January and UTC+1 in July.
How long is the flight from London to Oeiras?
A nonstop flight from London to Oeiras takes about 2 h 25 min, for a straight-line distance of about 1,580 km.
Which school holidays are best for Oeiras?
Oeiras has its best school-holiday weather during the summer holidays (score 80) and its weakest during the Christmas holidays (score 18). Holiday ratings (0–100): Easter holidays 35, May half-term 62, summer holidays 80, October half-term 53, Christmas holidays 18.