PORTUGAL · SINTRA · PENA PALACE IN MAY
On May 15 the sun comes up over Sintra at 6:22 am and goes down at 8:43 pm: 14 hours 21 minutes of daylight, enough to climb through the Park of Pena in the morning, eat lunch in the old town, and still reach the Moorish ramparts in good light. The air cooperates too. Average highs of 73.0°F (22.8°C) run 5.2 degrees above April’s and 6.0 below June’s, which is roughly the difference between walking uphill and suffering uphill.
What May takes back is certainty about the sky. Rain reaches the gauge on 5.7 days in an average May and totals 2.00 inches, nearly four times June’s 0.53 inch, and Pena stands high enough to sit inside the cloud that forms over the Sintra ridge while Lisbon stays clear. If your dates can slide, we have already written up April.
THE MONTH AT A GLANCE · PENA PALACE · MAY
May gives the hill 14 hours 21 minutes of daylight and two fewer rain days than April, at highs that stay in the low 70s, so the long climb through the park is comfortable rather than hot.
IPMA 1991–2020 NORMALS · STATION 579, LISBOA GAGO COUTINHO · PENA SITS HIGHER, COLDER AND MISTIER
Go for: long daylight, a 73.0°F afternoon on an exposed ridge, and rain days already down to 5.7 from April’s 7.7.
Think twice before: reading airport normals as the palace’s own weather: the thermometer sits 25 km away and about 400 m lower.
Normals: IPMA station 579 · Daylight: sunrise-sunset.org · full sources at the end
On this page
- May highs, lows and rain days73.0°F, 2.00 inches, 5.7 wet days
- What to wear for a 57°F dawn on the ridgeThe 15.6-degree swing, and the layers it needs
- Booking, the tourist tax and what we could not priceWhat we verified and what we didn’t
- Things to do in Sintra in MayThe park, Cruz Alta, the Moorish castle, Regaleira
- A two-day plan built around an 8:43 pm sunsetDay one on the hill, day two in town
- April or June instead?How the three months compare, degree by degree
- Is May worth it for a first visit?Who should come, who should wait
Everything that isn’t dated by the month sits elsewhere: tickets, the train and the climb up the ridge in our Sintra guide, the twelve-month view in when to visit Portugal, and the layers argument in what to pack.
Pena Palace weather in May: average highs, lows and rain days
| May normal (1991–2020) | Value |
|---|---|
| Average high | 73.0°F (22.8°C) |
| Average low | 57.4°F (14.1°C) |
| Precipitation | 2.00 in |
| Days with 0.04 in (1 mm) or more | 5.7 |
| Days with 0.39 in (10 mm) or more | 1.9 |
| Daylight, May 15 | 14h 21m |
| Sunrise / sunset, May 15 | 6:22 am / 8:43 pm |
Every figure here comes from IPMA, Portugal’s national weather service, and its 1991 to 2020 normals for station 579, Lisboa Gago Coutinho: a real thermometer at 103.9 m, not a model grid cell. Read the address before you pack. That station stands at Lisbon’s airport, 25 km from Sintra and roughly 400 m lower, while the palace sits in the cloud the ridge forms above it. Count on the hill running colder, wetter and mistier than 73.0°F and 57.4°F (22.8°C and 14.1°C).
Measurable rain falls on 5.7 days in an average May, about one day in five or six, and 1.9 of those days deliver 0.39 inch (10 mm) or more. Watch the thresholds: IPMA counts from 0.04 inch (1 mm), while American tables usually start at 0.10 inch, so the two counts are not interchangeable. For a three-day stay that means one damp half-day is the normal outcome, not the disaster, and two days in the whole month are the sort you spend indoors.
Night to afternoon, the spread is 15.6 degrees, wider than April’s 14.6 and narrower than June’s 17.3. It sets the shape of a Sintra day more than the headline high does: the early train is a jacket, the noon walk up through the park is not, and the ridge gives the wind back in the last hours of light.
Daylight on May 15 runs 14 hours 21 minutes, sunrise at 6:22 am and sunset at 8:43 pm in local time (the underlying figures are 05:22 and 19:43 UTC, and Portugal runs an hour ahead in May). The late end is the useful one, since the light stays on the trees long after the gates shut. We could not verify the palace’s May closing time, so check it with the monument before you build an evening around it.
How warm is Pena Palace in May? Morning lows of 57°F, afternoon highs of 73°F
Average high 73.0°F (22.8°C), average low 57.4°F (14.1°C), 15.6 degrees apart. The low belongs to the hour around sunrise rather than to your afternoon on the terrace, and it is the figure people underpack for after reading a single number on a booking page.
In practice: a fleece or light jacket for the 6:22 am end of the day, a shirt by the time you are climbing, closed shoes for granite steps that hold damp under the tree cover, and a rain shell small enough to live in a daypack. The terrace has no shade, and 73.0°F with the sun full on it reads warmer than 73.0°F in the park below.
On frost we have nothing to serve. No frost-night count for May appears in the record we read, and we will not infer one: 57.4°F is 25 degrees above freezing at a station 400 m under the palace. A cold dawn on the ramparts is entirely plausible, a frozen one is not something we can put a number on.
How busy is Pena Palace in May? Crowds, booking and the tourist tax
Where May sits in the year’s price cycle is the one thing we cannot chart. We found no occupancy series and no monthly room-rate series for Sintra, so we crown no month cheap and no month expensive. What the calendar does say is that May is the last month before the dry stretch opens, with June averaging 0.53 inch of rain against May’s 2.00. The euro figures we do have live in our trip cost guide.
Book the palace entry as soon as your dates are firm. We could not verify how far ahead May slots fill, so we give no number of weeks rather than invent one. The practical move holds either way: an early slot, one of the first trains out of Lisbon, and the walk up through the park before the middle of the day. Trains and the bus up the ridge are covered in our getting-around guide.
On the tourist tax, same discipline. We could not verify Sintra’s current municipal rate, so we quote no per-night amount, and the same applies if you sleep in Lisbon and ride out for the day. Treat it as a small nightly line on the bill and confirm the figure with your property when you book.
The one upgrade that genuinely changes May is the bed. A room in Sintra itself puts you on the hill ahead of the first arrivals from Lisbon and keeps you there for the last hour of a day that does not end until 8:43 pm. Meals, transport and tickets buy you the same month wherever you sleep. Where to stay in Portugal has the regional picture.
Things to do at Pena Palace in May: the park, Cruz Alta and Quinta da Regaleira
May buys a full outdoor day with a reasonable chance of keeping it. Rain days fall from April’s 7.7 to 5.7 and the monthly total from 2.50 inches to 2.00, while the thermometer stops well short of June’s 79.0°F. That combination is what makes the climb from the lower gate up to the terraces work at noon, which is exactly when it stops working later in the summer.
Inside the Park of Pena, the Chalet of the Countess of Edla sits low among the ferns and the Cruz Alta high point looks back at the palace across the treetops. Along the same ridge stand the ramparts of the Castelo dos Mouros. Down in town, Quinta da Regaleira’s initiation well spirals underground, Monserrate’s gardens run gentler, and the Atlantic cliffs at Cabo da Roca lie west.
Stone stays put through the year, air does not. Regaleira’s well is the same damp spiral in February as in August, and it is the walking between the sights that May rewrites: 73.0°F instead of April’s 67.8, and 5.7 wet days instead of 7.7. On the ridge itself, allow for mist the airport normals cannot see, since the thermometer feeding them sits 400 m lower and 25 km away.
We could not verify a free-admission day in May at Pena or at the other Sintra monuments, so we name none. What costs nothing either way: the lanes of the old town, the viewpoints along the road up the ridge, and the hour after dinner, when there is still light on the hill.
Pena Palace in May: a two-day itinerary
Day one belongs to the hill. Take the earliest Lisbon train you will tolerate, be at the gate for your slot, and work uphill through the park before the terraces fill: the Chalet of the Countess of Edla first, then the palace, then Cruz Alta for the view back. Lunch in the old town, out of the sun a 73.0°F afternoon still carries on open ground. Finish at the Castelo dos Mouros late in the day, when the light runs along the walls instead of down onto them.
Day two goes downhill: Quinta da Regaleira early, Monserrate’s gardens after, then west to Cabo da Roca for the Atlantic wind and back in time for dinner before 8:43 pm. If yours turns out to be one of the 1.9 days an average May gets with 0.39 inch or more, reverse it. Tunnels, tiled interiors and a long lunch take rain better than an exposed rampart, and the train back to Lisbon runs all day.
Pena Palace in May vs April and June
| Normal (1991–2020) | April | May | June |
|---|---|---|---|
| Average high | 67.8°F (19.9°C) | 73.0°F (22.8°C) | 79.0°F (26.1°C) |
| Average low | 53.2°F (11.8°C) | 57.4°F (14.1°C) | 61.7°F (16.5°C) |
| Precipitation | 2.50 in | 2.00 in | 0.53 in |
| Days with 0.04 in or more | 7.7 | 5.7 | 2.0 |
The three months split on rain more cleanly than on heat. April averages 67.8°F with 2.50 inches over 7.7 wet days. May runs 73.0°F, 2.00 inches, 5.7 days. June jumps to 79.0°F with 0.53 inch over just 2.0 days. Note where May actually lands: its temperature sits almost exactly between its neighbors, but its rain total is far closer to April’s than to June’s. We found no sea-surface series for the coast below Sintra, so we give no water temperature for any of the three.
Slide four weeks back and you give up 5.2 degrees and take on two extra rain days in exchange for cooler walking, which is the whole case for April. Slide forward and June’s 0.53 inch across 2.0 days is near certainty for a clear terrace, paid for with a 79.0°F climb on a ridge with very little shade.
Is May a good time to visit Pena Palace?
Yes for anyone who intends to walk all day: 73.0°F, 14 hours 21 minutes of light, and rain on fewer than one day in five. No if the trip hangs on a single photograph of the palace against a clean sky, because 5.7 rain days and a ridge that makes its own cloud will not guarantee it. And no if you want the hill quiet, since we have no crowd data for any date and will not pretend otherwise.
When the answer is no, June is where to move. Its 0.53 inch over 2.0 days is the driest of the three by a wide margin, and 79.0°F is warm without being punishing if you start early. Going back to April costs 5.2 degrees and adds two wet days, and it only makes sense when cool walking matters more to you than dry walking.
What May alone puts together is a 73.0°F afternoon, the rain-day count already down to 5.7, and 14 hours 21 minutes of daylight to spend them in. Neither neighbor repeats that set.
The last word
Book the room in Sintra and take the earliest train you can face: that single decision does more for a May visit than any ticket upgrade. Then carry one number up the hill. Of the 2.00 inches an average May brings, at least a third arrives on the 1.9 days that deliver 0.39 inch or more. The rest is the kind of drizzle you walk through in a shell, on a ridge that stays lit until 8:43 pm.
Sources & data for this guide
- May normals (73.0°F high, 57.4°F low, 2.00 in) · IPMA, 1991–2020 climate normals, station 579 Lisboa Gago Coutinho, altitude 103.9 m · checked Sep 24, 2026
- Rain-day counts (5.7 days at 0.04 in or more, 1.9 days at 0.39 in or more) · IPMA thresholds of 1 mm and 10 mm, not the 0.10-inch threshold of US tables · checked Sep 24, 2026
- April and June normals used in the comparison · same IPMA station and same 1991–2020 period, so they are measured values, not estimates · checked Sep 24, 2026
- Daylight, sunrise and sunset for May 15 (05:22 and 19:43 UTC, converted to local time) · sunrise-sunset.org · checked Sep 24, 2026
- Scope caveat: the station sits at Lisbon’s airport, about 25 km from Sintra and roughly 400 m lower, while Pena stands in the cloud that forms over the ridge · treat the figures as coastal-lowland readings, not hilltop ones
- We could not verify Pena Palace ticket prices, May opening and closing hours, any free-admission day, Sintra’s tourist-tax rate, an occupancy or room-rate series, or a sea-surface temperature for the coast below Sintra, so we quote none of them · check the monument and your property when you book