SINTRA · MAY · 38.8° N
May puts Sintra’s normals at 73.0°F by day and 57.4°F at night, and the light on the 15th runs 14 hours 21 minutes, from 06:22 to 20:43 local. What that buys is a hilltop of palaces walked in shirtsleeves at two in the afternoon and in a fleece at nine in the morning, with Pena’s park gates open from 09:00 and Monserrate’s open until 19:00.
What May takes back is rain. 2.00 inches fall across 5.7 wet days, against June’s 0.53 inches over 2.0 days, so a week here in May can reasonably expect one soaked afternoon. Anyone coming out from Lisbon for a single day trip has roughly a one-in-five chance of meeting measurable rain, and no way to move the booking once the train is boarded.
THE MONTH AT A GLANCE · SINTRA IN MAY
May gives Sintra long light and two fewer wet days than April, at the price of a hill that runs colder and mistier than any figure measured down on the Lisbon plain.
AVG HIGH 73.0°F · 5.7 WET DAYS · 14H21 OF LIGHT ON MAY 15 · PENA PARK AND PALACE 20 EUR
Go for: Pena’s 210-hectare park and Monserrate’s 50 walked without June’s heat, gates from 09:00 and daylight holding past 20:30.
Think twice before: packing for the 73.0°F reading alone. It comes from a thermometer 20 km away on the plain, and the serra sits several degrees colder.
Normals: IPMA station 579, 1991-2020 · Tickets and gates: Parques de Sintra · full sources at the end
On this page
- Average highs, lows and rain days in MaySintra weather in May
- What to wear morning and afternoonHow warm Sintra gets in May
- Crowds, ticket prices and bookingHow busy Sintra is in May
- Things to do in Sintra in MayPena, Monserrate and Cabo da Roca
- A two-day plan built around the gate timesThe two-day itinerary
- Is April or June the better month?May against April and June, in figures
- Is May a good time to visit Sintra?The verdict, and who should shift
Every figure here comes from two sources and no others: IPMA’s 1991-2020 climate normals for station 579, Lisboa Gago Coutinho, and the tariffs and gate times Parques de Sintra published on September 22, 2026. Where our sources are silent we say so instead of filling the gap.
Sintra weather in May: average highs, lows and rain days
| Measure | May normal |
|---|---|
| Average high | 73.0°F (22.8°C) |
| Average low | 57.4°F (14.1°C) |
| Precipitation | 2.00 in |
| Days with 1 mm (0.04 in) or more | 5.7 |
| Days with 10 mm (0.39 in) or more | 1.9 |
| Daylight on May 15 | 14 h 21 min |
| Sunrise and sunset, May 15 | 06:22 · 20:43 local |
The normals in the table above are IPMA’s, the Portuguese national weather service, for the 1991-2020 period at station 579, Lisboa Gago Coutinho. That is a real thermometer at 103.9 meters, not a model grid cell, and the distinction matters when two websites give you different Mays. It also sits about 20 km away on the Lisbon plain, next to a runway. Read 73.0°F and 57.4°F as the warm floor of your trip: the Sintra hill makes its own cloud and runs several degrees colder and a good deal mistier.
In an average May, 5.7 days record at least 1 mm of rain, which is measurable wet about one day in five. Of those, 1.9 reach 10 mm or more, so roughly two days in the month deliver a soaking rather than a passing shower. Careful with comparisons: these are IPMA’s 1 mm and 10 mm thresholds, not the 0.10-inch line American tables use, and the counts are not interchangeable. Pack a hooded shell and choose the indoor room in advance, the National Palace in the town center being the obvious one at 13 EUR.
Between the mean high and the mean low sit 15.6 degrees of daily travel, and the serra subtracts from both ends. That is a packing instruction more than a weather note. Short sleeves work for a two o’clock terrace, a real layer is needed at a nine o’clock gate, and something windproof belongs in the bag for the Moorish Castle walls and for Cabo da Roca, the westernmost point of mainland Europe, where the lighthouse courtyard is open 09:30 to 17:30. Our packing guide covers the rest of the trip.
Daylight on May 15 runs 14 hours 21 minutes, sunrise at 06:22 and sunset at 20:43 local time. The calculation gives 05:22 and 19:43 UTC, and Portugal runs an hour ahead in May. Practically, the light outlasts the monuments: Pena’s park closes at 19:00, the Moorish Castle at 18:00, and the final hour and three quarters of daylight belongs to the town, to dinner and to the walk back to the station.
How warm is Sintra in May?
73.0°F is a mean of daily maximums, the value the afternoons average out to, not a ceiling and nothing like what the morning delivers. Set against it, 57.4°F as the mean low, and the gap between them is 15.6 degrees inside a single day. Both readings were taken on the plain. On the serra, shave a few degrees off each and add mist, and you have the actual conditions at Pena’s terrace.
In wearable terms: a fleece or a light jacket at the 09:00 park gate, off by the time you reach Monserrate’s lawns in the early afternoon, back on at the castle walls where the wind has an opinion. Sun matters more than heat at this latitude in May, with the sun up for over fourteen hours, so a hat does more work than an extra sweater for most people.
On freezing nights we have nothing to report and will not pretend otherwise: the IPMA normals we read carry a monthly mean low of 57.4°F and no count of nights at or below 32°F, so we give no frost figure. A mean low 25 degrees above freezing is not a packing problem. Nor is the sea, because we found no sea-surface series for this coast and therefore offer no water temperature and no swim verdict.
How busy is Sintra in May? Crowds, ticket prices and booking
We found no occupancy series and no monthly room-rate series for Sintra, so we crown no month cheap and no month expensive. What we can verify is the tariff list Parques de Sintra published on September 22, 2026, which carries no seasonal column: 12 EUR for Pena’s park, 20 EUR for the Essential visit to park and palace, 45 EUR for the Full Tour, free for children under 6. We read no separate May price for any of them.
How many weeks ahead to book is the one question we cannot put a number on, since we could not read an advance-booking window or an attendance figure from the operator. The times we can read are the gates, and in May they are the binding constraint. Pena’s palace takes its last admission at 17:30 and closes at 18:30 while the park stays open to 19:00, and the Moorish Castle stops admitting at 17:30. Sunset comes at 20:43, more than an hour and a half after the last gate shuts.
We could not verify a lodging-tax rate for Sintra, so no percentage appears anywhere above. The same reserve covers the ride in: our sources carry no train fare from Lisbon, no journey time and no bus timetable for the serra roads, which is why the only euros quoted here are Parques de Sintra’s own. For the network as a whole, our guide to getting around Portugal is the place to start, and the operator’s own page is the only one to trust on the fare.
One line on the price list changes a May day more than any other: 4.50 EUR for the round-trip transfer between the Pena park entrance and the palace door. At 73.0°F the walk up through the trees is pleasant rather than punishing, so the transfer matters most for short legs, tired knees, or a party that reached the gate at four and still wants the palace before the 17:30 cutoff.
Things to do in Sintra in May: Pena, Monserrate and Cabo da Roca
May is the month a single day holds a hilltop and a coast. Daylight runs 14 hours 21 minutes on the 15th, and wet days drop to 5.7 from April’s 7.7, which is the difference between planning an outdoor sequence and hoping for one. June is drier still, at 2.0 wet days, but it arrives at 79.0°F, and heat is a tax on any day built around climbing.
Pena’s park runs to 210 hectares behind a stone wall and takes in the Tapada do Mocho and the Moorish Castle: 12 EUR for the park alone, 20 EUR with the palace, open 09:00 to 19:00. The castle itself is 12 EUR, 10 EUR for ages 6 to 17 and over 65, 09:30 to 18:00. Monserrate, 50 hectares on the northern slopes, is 12 EUR. The Convent of the Capuchos asks 11 EUR and closes at 17:30, and Cabo da Roca’s lighthouse is 5 EUR, or 10 EUR up the tower.
A garden planted by microclimatic zone keeps its plan all year, and Monserrate’s 3,000-plus species were placed after exactly that kind of survey of the ground. The air is what changes. May’s 73.0°F against June’s 79.0 is the difference between walking those 50 hectares and hunting shade inside them, and the same six degrees apply to Ferdinand II’s park at Pena, planted from around 1840 with species carried in from North America, Asia and New Zealand.
Villa Sassetti charges nothing between 10:00 and 18:00, and the gardens of the National Palace of Sintra are free to enter, while the palace itself is 13 EUR for the Essential visit, 09:30 to 18:30. Both of those free hours end well before the 20:43 sunset does, so slot them in the middle of the afternoon rather than saving them for the end of the day.
Sintra in May: a two-day itinerary
Day one belongs to the high ground. Be at Pena’s park gate for 09:00 and inside the palace when it opens at 09:30, before the morning mist off the serra has fully lifted. Walk the 210 hectares until midday, drop to the Moorish Castle in the early afternoon, and keep 17:30 in mind, since that is last admission at both. Eat late in town, take the free palace gardens at four, and let the 20:43 sunset carry the evening.
Day two goes west and low: Monserrate’s park from 09:00, the Convent of the Capuchos at 11 EUR before its 17:30 close, then the Cabo da Roca lighthouse, whose courtyard and interpretation center run 09:30 to 17:30. If one of the month’s 1.9 heavy-rain days lands on you, swap the coast for the town center and the National Palace of Sintra, 13 EUR, open to 18:30, with the free gardens attached if the sky clears.
Sintra in May vs April and June
| April | May | June | |
|---|---|---|---|
| Average high | 67.8°F | 73.0°F | 79.0°F |
| Average low | 53.2°F | 57.4°F | 61.7°F |
| Precipitation | 2.50 in | 2.00 in | 0.53 in |
| Days with 1 mm (0.04 in) or more | 7.7 | 5.7 | 2.0 |
| Sea temperature | not verified | not verified | not verified |
Across those eight weeks the mean high climbs 11.2 degrees, 67.8 to 79.0, and the rain collapses from 2.50 inches to 0.53. May sits in the middle on both counts, at 73.0°F and 2.00 inches spread over 5.7 days. All four April and June figures come from the same IPMA station and the same 1991-2020 period as May’s, so nothing in that table is an estimate. The water is the blank: no sea-surface series turned up for this stretch of coast, in any of the three months.
Move four weeks forward and you gain 6.0 degrees of afternoon warmth and lose 3.7 wet days, which is the strongest dry-weather trade on the calendar here. Move four weeks back and you pay 5.2 degrees and two extra wet days for a cooler climb up to Pena, which suits walkers and almost nobody else. Our April page makes that case, and the country-wide verdict sets it against the rest of Portugal.
Is May a good time to visit Sintra?
For walkers, garden people and anyone who intends to cover Pena’s park on foot, yes without hesitation: 73.0°F is the temperature at which 210 hectares of hillside is a pleasure rather than a trial, and the light runs to 20:43. For a traveler whose plan depends on dry skies over a fixed two-day window, the 5.7 wet days are a real risk, and one of those days in five arrives without regard for your train ticket.
If that risk is unacceptable, shift to June. The numbers are plain: 0.53 inches over 2.0 wet days, against May’s 2.00 inches over 5.7. You pay for it with 79.0°F afternoons on a hill with a serious amount of climbing, and with the loss of whatever the serra’s morning mist is worth to you at Pena’s gate.
Of the three months we can put figures to, only May pairs more than fourteen hours of daylight with fewer than six wet days and a mean high still under 75°F.
The last word
Two days is the honest minimum, and it still leaves most of the place unseen. The cultural landscape UNESCO inscribed in 1995 covers 946 hectares with a 3,641-hectare buffer around it, all of it inside the Sintra-Cascais Natural Park and classified a National Monument, and Parques de Sintra runs eleven parks and monuments in and around that perimeter. Pick three of the eleven, take Pena’s 09:00 gate on the first morning, and keep the 45 EUR Full Tour for a day when rain is not on the board.
Sources & data for this guide
- May normals (73.0°F high, 57.4°F low, 2.00 in) and wet-day counts at 1 mm and 10 mm · IPMA, climate normals 1991-2020, station 579 Lisboa Gago Coutinho, altitude 103.9 m · checked Sep 22, 2026
- April and June normals used in the comparison table · same IPMA station, same 1991-2020 period · checked Sep 22, 2026
- Daylight of 14 h 21 min, sunrise 05:22 UTC and sunset 19:43 UTC on May 15, converted to local time · sunrise-sunset.org · checked Sep 22, 2026
- Ticket prices, opening hours and last admissions at Pena, the Moorish Castle, Monserrate, Capuchos, the National Palace, Villa Sassetti and Cabo da Roca · Parques de Sintra – Monte da Lua, ‘Opening Times and Prices’ · checked Sep 22, 2026
- Inscription in 1995 under criteria (ii), (iv) and (v), 946 ha property and 3,641 ha buffer, Pena’s 210 ha, Monserrate’s 50 ha and 3,000 species, protection since 1994 · UNESCO World Heritage Centre, file 723 · checked Sep 22, 2026
- We could not verify a Lisbon train fare or journey time, a serra bus timetable, a lodging-tax rate, an occupancy series or a sea-surface temperature series, so no figure is given for any of them. Prices and gate times change · check the operator when you book.