Best Time to Visit Coimbra: Month-by-Month Weather, Rain Days and the Quietest Months

COIMBRA · THE 12-MONTH VERDICT · 1991-2020 NORMALS

Coimbra stacks itself up a hillside above the Mondego: a medieval core of stone stairways, a university crowning the top, a river doing the flat work at the bottom. The climb is the visit, and it is why the calendar counts for more here than it would on a flat waterfront. Wet granite underfoot in November is a different city from dry granite in September.

The year splits cleanly enough to plan around. July averages 0.35 inches of rain at the valley station, November 4.78. The trap sits between them: October keeps summery 73.8°F afternoons while delivering 4.51 inches of rain across 10.3 wet days. Book on the temperature alone and that is the month you land in.

On this page

• Coimbra weather in my monthThe 12-month table, highs to rain days
• The single best month to goSeptember, with the figures
• Swimming and the nearest coastSea temperature and the drive west
• The quietest months in CoimbraNovember to February, by the calendar
• Which month to avoidNovember: 4.78 inches, 11.5 wet days
• Is May or September better than August?The three shoulder months, side by side

One line, if that is all you need: September, with 81.3°F afternoons and 5.2 days of rain. Every other month trades one of those two figures away, and the trades are not equal.

Coimbra weather month by month: highs, lows and rain days

Coimbra runs on two halves rather than four seasons. Four months come in under two inches of rain: June at 1.02, July at 0.35, August at 0.58, September at 1.96. Four come in above 4.3: October 4.51, November 4.78, December 4.38, January 4.47. February through May fill the gap, from 2.55 to 3.33 inches.

Two months do the switching. June dries the year out, taking wet days from May’s 8.5 down to 3.7 while afternoons climb from 73.9°F to 79.3. October reverses it in a single step: wet days go from September’s 5.2 to 10.3, rainfall from 1.96 inches to 4.51, and 7.5 degrees come off the afternoon high at the same time.

November is the hardest month, and it is hardest for anyone who planned to walk. Eleven and a half days record at least 1 mm of rain, 4.5 of them 10 mm or more, and the 15th gives only 10 hours of daylight. For a trip built on museums and long lunches those figures barely register. For a day of climbing to the university and back down to the river, they decide the day.

All of it comes from one thermometer: IPMA station 707 at Coimbra Bencanta, 26.6 meters up, down on the Mondego floodplain, averaged over 1991 to 2020. That is the city, not the region. High ground inland runs colder and far wetter, and the coast an hour west keeps its own weather. The rain-day counts use the Portuguese service’s thresholds, 1 mm and 10 mm, not the 0.10-inch cutoff American tables print, so the two sets are not interchangeable.

When is the best time to visit Coimbra?

September. Afternoons average 81.3°F, nights 57.4, rain totals 1.96 inches over 5.2 wet days, and the sun is still up for 12 hours 30 minutes on the 15th. That is what a hill town wants: warm enough for the river at the bottom, survivable for the stairways at the top.

August is drier, 0.58 inches against 1.96, and hotter at 84.4°F. Those 3.1 degrees off the afternoon are the reason to wait, because the climb through the old town happens in the middle of the day whether you intend it or not. Waiting a month longer costs more than it saves: October holds just 73.8°F, doubles the wet days from 5.2 to 10.3, and gives 1 hour 19 minutes less light.

Coimbra’s best month is not automatically Portugal’s. The north and the Douro run wetter, the Algarve holds its summer later, and a two-week route has to average them out. Our 12-month verdict for the country settles that, and the packing list handles the layer question a 57.4°F September night raises.

When can you swim near Coimbra: sea temperature and the nearest beaches

Coimbra is a river city. The Mondego runs through it and the Atlantic is a drive west, out past Figueira da Foz at the river mouth (roughly 45 minutes by car, est.). So the swim question here is a beach-day question, and the beach is open ocean rather than a sheltered bay. Our climate file for the city covers air, rain and daylight and carries no sea-temperature series for that coast, so we are not going to print a water figure we have not measured.

One caution about the figures published elsewhere. A sea temperature is usually an average of daily maximum readings, the warmest slice of the afternoon, not a mean across 24 hours, so the water at nine in the morning sits below the number on the chart. What the Bencanta record does tell you is when a beach day is a safe bet: June through September, with rainfall between 0.35 and 1.96 inches and no month above 5.2 wet days.

When is Coimbra quietest?

The quiet stretch is November through February, and that is a calendar statement rather than a price ranking. We hold no occupancy or nightly-rate series for Coimbra, so no month here gets called the cheapest. What the calendar does say is blunt: 9 hours 23 minutes of daylight on December 15, sunset at 5:10 p.m., and four straight months of rain between 3.19 and 4.78 inches. Costs for the country sit in our trip-cost guide.

Winter in the Mondego valley stays mild even when it is dark. January afternoons average 59.0°F and February 61.5, fleece weather rather than parka weather. February also brings the first real drying of the year: 8.6 wet days against January’s 11.3, and 2.7 days at 10 mm or more against 4.3. A city with a Baroque library, two cathedrals and a serious lunch habit absorbs that season without much complaint.

What you give up is light and coast. On January 15 the sun comes up at 7:52 a.m. and is gone by 5:33 p.m., leaving 9 hours 40 minutes to work with, and 4.3 January days deliver 10 mm of rain or more, second only to November’s 4.5. Beach plans are off. So, in practice, is any itinerary that puts two long outdoor stretches in the same day.

Which month should you avoid in Coimbra?

November, and specifically for travelers whose days depend on being outside. Its 4.78 inches is the year’s highest total, 11.5 days record at least 1 mm, more than a third of the month, and 4.5 of those pass 10 mm. Set that beside July’s 1.7 wet days and the argument closes itself. Daylight is down to 10 hours flat on the 15th, with sunset at 5:18 p.m.

It is not, however, a cold month. Afternoons still average 64.4°F, a full 5.4 degrees above January’s 59.0, and nights hold at 46.9. Do the subtraction and about 18 of the 30 days record under 1 mm of rain. For a city whose best hours are spent under a vaulted ceiling, that ratio works, and the valley under low cloud is the version of Coimbra that stays with people longest.

Is the shoulder season worth it in Coimbra?

The shoulder here is May, June and September. Measured against August’s 84.4°F, May runs 10.5 degrees cooler at 73.9, June 5.1 cooler at 79.3, September 3.1 cooler at 81.3. Nights follow the same order: 53.2, 57.6 and 57.4, against August’s 60.3.

June owns the light, not July: 15 hours 5 minutes on the 15th against 13 hours 48 in mid-August, with sunset at 9:06 p.m. local time. It is also drier than every month except July and August, 1.02 inches across 3.7 wet days. On a hillside where the terraces face the river and the evening sun, that combination is worth building a trip around.

May charges for the privilege of cooler days. It brings 2.55 inches over 8.5 wet days, more than four times August’s 0.58 inches and nearly four times its 2.2 wet days. April is wetter still, 3.33 inches across 10.6 days, so the useful shoulder starts in May and not before. Nights at 53.2°F also end an outdoor dinner earlier than a September one at 57.4.

Ranked: September first, June second, May third. September holds 81.3°F with only 5.2 wet days. June trades two degrees of afternoon warmth for the longest evenings of the year. May asks you to accept 8.5 wet days in return for a cooler climb. If a single washed-out day would sink the trip, none of the three beats July’s 1.7 wet days, and that is the real price of skipping high summer.

The last word

One month has gone unmentioned and deserves its line. March averages 66.4°F with 2.97 inches of rain over 9.4 wet days, but only 2.4 of those days pass 10 mm, fewer than any month from October through April, and the 15th gives 11 hours 59 minutes of light. Take March for a trip of libraries, lunch and one good climb, with a small umbrella in the bag. Take September for everything else, and book the room on the hill rather than by the river.

Sources & data for this guide

• Monthly normals 1991-2020, highs, lows, precipitation, and rain days at the 1 mm and 10 mm thresholds · IPMA, station 707 Coimbra Bencanta, 26.6 m · checked Sep 13, 2026
• Sunrise, sunset and daylight length on the 15th of each month, converted to Europe/Lisbon · sunrise-sunset.org · checked Sep 13, 2026
• Our cards on the table: we hold no sea-temperature series for the coast west of Coimbra, so this guide prints no water figure and no swimming window in degrees.
• We also hold no occupancy or nightly-rate series for the city, so the quiet months are named from the calendar and no month is ranked as the cheapest.
• The 1 mm and 10 mm thresholds are the Portuguese service’s own · they are not the 0.10-inch threshold used in US climate tables, and the counts do not convert.
• The drive time to the coast is an editorial estimate, marked (est.) in the text · check current roads and parking before a beach day.