Best Time to Visit the Alentejo: Weather Month by Month, Summer Heat and the Quiet Season

ALENTEJO · BEST TIME TO VISIT · ÉVORA · 248 M

A trip to the Alentejo usually means a rental car, two or three white hill towns and a dinner table nobody leaves before eleven. The month decides how much of that happens outdoors. Between a July afternoon averaging 91.9°F on the Évora thermometer and a December inside a month that collects 3.35 inches of rain, the same itinerary produces two different vacations.

Our answer is May, with September a close second, and July and August handed to travelers willing to run their sightseeing before eleven and after six. The normals below come from a single station, and where that station stands changes what the numbers mean.

On this page

• The single best month to goMay, at 77.0°F
• Alentejo weather month by monthThe 12-month table
• How hot Alentejo summers getJuly and August above 90°F
• The quietest months to travelNovember through February
• The month to avoid with kidsAugust, and for whom
• April, May, September or OctoberWhat the shoulder trades
• When to visit Portugal as a wholeThe country-wide verdict

The practical frame first: most American visitors fly into Lisbon, collect a car at the airport and give the Alentejo three or four nights inside a ten-day Portugal itinerary. Évora makes the easiest base for a first trip. The booking side lives next door, in our car rental guide and the flights page.

Alentejo weather month by month: highs, lows, rain days and daylight

The year splits into a dry core and a wet rim: June, July and August record 0.42, 0.11 and 0.24 inches of rain, while October through January each collect between 2.70 and 3.39 inches and post rain on 7.7 to 8.8 days. Temperature follows the same curve, from 57.4°F highs in January to 92.3°F in August.

Two transitions do the swinging. May to June adds 9.4°F to the average high, 77.0 to 86.4, and cuts rain days from 6.0 to 1.7. September to October runs it backward: the high falls 9.7°F, 85.1 to 75.4, monthly rainfall climbs from 1.33 inches to 3.21, and rain days go from 3.6 to 7.7. Book either transition and your week is a bet on which side of the switch it lands.

For a driving trip, December is the awkward month. The sun sets at 5:13 pm local on the 15th, leaving 9 hours 33 minutes of daylight, and the month averages 3.35 inches of rain across 8.7 days, 3.2 of them at 10 mm (0.39 inch) or more. Rooms are easy to book at short notice. Fitting two hill towns and a wine cellar into one of those days is not realistic.

Every figure here comes from one instrument: IPMA station 558 at Évora, 247.6 m above sea level, standing in the Alentejo itself rather than a coastal proxy, on 1991-2020 normals. Elsewhere in the region the readings differ. High ground runs colder and far wetter, and the coast around Comporta and Vila Nova de Milfontes keeps its own weather. The rain-day counts use the Portuguese service’s thresholds, 1 mm and 10 mm, not the 0.10-inch threshold American tables use, so the two sets of counts are not interchangeable.

When is the best time to visit the Alentejo? May, at 77.0°F

May. The average high is 77.0°F, the average low 51.6°F, with 1.83 inches of rain spread over 6.0 days and 14 hours 20 minutes of daylight on the 15th, sunrise at 6:17 am and sunset at 8:37 pm local. That combination lets you walk Évora’s walls at noon, drive to a second town after lunch and still eat outside at nine.

June is drier, 1.7 rain days against 6.0, and it also runs 9.4°F hotter by day, 86.4°F against 77.0, which pushes the middle of every afternoon indoors. April keeps mild afternoons at 69.3°F but brings 8.0 rain days and 2.44 inches. May is the only month that takes fewer rain days than April and lower heat than June.

The detail sits in the neighboring guides: our Portugal-wide best-time verdict for how the same weeks behave in Lisbon, the Douro and the Algarve, and the Évora guide for what to do with the base once the flights are booked. That 51.6°F night average is a jacket, and the packing list covers the rest.

How hot does the Alentejo get in summer? July and August above 90°F

July averages 91.9°F by day, August 92.3°F, the two hottest months of the twelve. Nights fall further than visitors expect: average lows of 60.1°F and 60.8°F, a 31.5°F swing in August between the afternoon and dawn. Rain is close to absent, 0.6 and 0.7 days at 1 mm or more. On August 15 the sun sets at 8:26 pm local, which is why dinner starts so late.

One thing we cannot give you: this record carries highs, lows, precipitation and rain-day counts, and no humidity reading at all, so any heat-index figure for an Alentejo August would be ours to invent. What the record does place is the station itself, 248 m up and well inland, not on the coast, so a beach week at Comporta is not what these numbers describe. Rent a car with air conditioning and check that it works in the airport lot.

When is the Alentejo quietest? The November-to-February low season

The calendar sets the quiet half, not us. European school holidays and the Portuguese coast season fall in July and August, and the low season runs roughly November through February. Those months also hold the wettest and darkest figures on the Évora record: 3.39 inches in November, 3.35 in December, 8.6 rain days in January, and under ten hours of daylight on the 15th in both December and January.

February is where the quiet season pays. Days average 60.3°F, rain totals 2.06 inches over 7.0 days, the lowest count of the winter half, and daylight is back to 10 hours 49 minutes. That buys the Roman temple and the cathedral roof without a coach party in front of them, a hotel bookable a week out, and a car available on short notice. For a long weekend rather than a full vacation, it is a defensible booking.

What you give up is measurable. December delivers 3.2 days at 10 mm (0.39 inch) or more against July’s 0.1, nights average 41.5°F, and the light is gone by 5:13 pm. A day built on cork-oak back roads gets barely two-thirds of June’s driving light, and swimming on the Alentejo coast is off the table. Plan indoor anchors: the wine cellars, the Évora museums, a two-hour lunch.

Which month should you avoid in the Alentejo? August, for some travelers

August, and only for certain trips. At an average high of 92.3°F, with 13 hours 42 minutes of daylight on the 15th, the block from noon to five is unusable for families with small children, for anyone crossing marble town squares on foot, and for walkers in the cork country. It is also the month when Portuguese holidays fill the coast, so the beaches you drive to are at their busiest.

It also carries the most bookable weather of the year. The month totals 0.24 inches of rain over 0.7 days at 1 mm or more, so an outdoor reservation or a festival night almost never washes out, and the 60.8°F average low makes the hours after eight the usable ones. Travelers who sleep late, swim at midday and sightsee at dusk get a weather-proof week out of it. Choose a hotel with a pool.

Is the shoulder season worth it in the Alentejo? April, May, September and October

Four months qualify, two in front of the heat and two behind it. September runs 7.2°F cooler than August, 85.1 against 92.3, on 3.6 rain days. October drops 16.9°F below August, to 75.4. April sits 22.6°F under July, at 69.3°F. Those gaps are measured against the peak on the same thermometer, not against a coastal station.

What the shoulder buys is the middle of the day. At 75.4°F in October or 69.3°F in April you can walk Monsaraz or Marvão at 2 pm, drive with the windows down and stand in a vineyard without counting minutes. September goes further, keeping summer’s dryness at 1.33 inches while handing back seven degrees of heat.

It takes back daylight and certainty. October gives 11 hours 15 minutes on the 15th against June’s 14 hours 54, three hours and thirty-nine minutes less to drive and look in. October also brings 7.7 rain days and 2.8 days at 10 mm or more, against 0.6 and 0.1 in July. April is wetter than May, 8.0 rain days to 6.0, on 2.44 inches to 1.83.

Ranked: May, then September, then April, then October. September holds the warmth that keeps evenings outdoors and has already shed the 92.3°F of August. October is the month to book with a fallback in the file, a museum day and a cellar visit, because nearly one day in four collects measurable rain.

The last word

Book May if the dates are yours, fly into Lisbon, pick the car up there and give the Alentejo four nights rather than two. If May is gone, March is the fallback nobody plans for: twelve hours of daylight on the 15th, 65.7°F afternoons, 7.5 rain days to wager against, and hill towns still half empty. Whatever month wins, build the day around the split this thermometer records, mornings outside and the middle of the afternoon indoors from June through September.

Sources & data for this guide

• Monthly normals for highs, lows, precipitation and rain-day counts · IPMA (Instituto Português do Mar e da Atmosfera), 1991-2020 normals, station 558 Évora, altitude 247.6 m · checked Sep 12, 2026
• Rain-day thresholds of 1 mm (0.04 inch) and 10 mm (0.39 inch) are the Portuguese service’s own, not the 0.10-inch threshold used by US tables · IPMA · checked Sep 12, 2026
• Daylight, sunrise and sunset on the 15th of each month, UTC and converted to local time · sunrise-sunset.org · checked Sep 12, 2026
• Editorial admission: this record carries no humidity normals, no heat-index series and no sea-surface temperatures, so we quote none. Coastal Alentejo and high ground read differently from Évora.
• No price or occupancy series was available to us, so “low season” here is a calendar statement, never a claim about what a week costs · check rates when you book.