Coimbra Weather by Month: A Complete Guide to Coimbra, Portugal

Coimbra, Portugal, the university city on the River Mondego, sits roughly 40 km inland from the Atlantic as the crow flies, close enough for the ocean to moderate its winters but far enough up the Mondego valley for its summers to turn properly hot. Everything on this page comes from one place: IPMA's official 1991 to 2020 climate normals for the Coimbra / Bencanta station, number 707, at 40.2134N 8.4552W, altitude 26.6 m. That is the city's own station, 3 km from the centre, not a coastal proxy and not a district figure, and the district of Coimbra, which does reach the Atlantic, is a different geography with different numbers. Read the table before trusting any summary, because two of the widely repeated claims about this city's weather are inverted, and this page corrects both.

What Kind of Climate Does Coimbra, Portugal Have?

Coimbra has a temperate climate with a pronounced dry season: mild, wet winters from November to March, and hot, almost rainless summers from June to August. The yearly mean temperature is 16.2 C, the mean maximum 21.9 C, and total annual rainfall 866 mm spread over about 94 days with a millimetre or more. August is the hottest month and November the wettest, and the transition between the two regimes happens abruptly in October, not gradually.

The headline number most visitors want is the annual picture: 866 mm of rain across the year, which is more than many people expect from a southern European city, but 39.9 days a year reaching 30 C, which is more than many expect too. Coimbra gets both. The rain is concentrated almost entirely in the cold half of the year, with November at 121.5 mm, October at 114.5 mm and January at 113.5 mm, while July records just 8.9 mm and August 14.8 mm. Summer here is not a slightly warmer spring, it is a genuinely dry season, and the city's vegetation and its festival calendar both reflect that.

Those are IPMA's normals for the Coimbra / Bencanta station, the official 1991 to 2020 series, and they are the only figures this site publishes. If you are comparing Coimbra with other stops on a Portugal route, the same table answers the question directly: winters are cooler and wetter than the Algarve's, summers are hotter than Porto's coast, and the shoulder seasons are where the city is at its best. For a broader planning view, see the main Coimbra travel guide and what to do in Coimbra.

What Is the Weather in Coimbra Month by Month?

January and February are the coldest pair, with mean maximums of 15.0 C and 16.4 C and heavy rain, 113.5 mm and 81.0 mm. March and April warm to 19.1 C and 20.5 C but stay damp. May opens the dry season at 23.3 C. June, July and August are hot and nearly rainless, peaking at 29.1 C.

September stays summer-warm at 27.4 C, then October plunges to 114.5 mm and November is the wettest month at 121.5 mm.

That single paragraph is the honest compressed version of the table above, and the shape of it matters more than any individual number. Coimbra's year is not a gentle curve, it is a plateau and a cliff. From June through September the city sits between 26.3 C and 29.1 C mean maximum with monthly rain never reaching 50 mm, and then October arrives and the monthly total more than doubles, from 49.9 mm to 114.5 mm, in a single step. Visitors who arrive in early October expecting late-summer weather can meet the first real autumn storms of the year instead.

The monthly character column is interpretation, but every number beside it is straight from the IPMA series. May deserves a special word: at 23.3 C mean maximum, 64.7 mm of rain and only 8.5 rainy days, it is statistically one of the two best months in the city, and it is also the month of Queima das Fitas, the student festival that closes the University's visitor circuit on 24 May and suspends visits at Mosteiro de Santa Cruz on the Cortejo parade day. The Queima das Fitas guide covers what that means for planning; the weather and the festival peak together.

When Is the Best Month to Visit Coimbra?

For most visitors the best months are May, June and September. May averages 23.3 C with 64.7 mm of rain, June 26.3 C with just 26.0 mm, and September 27.4 C with 49.9 mm. September is the insider pick because it is as warm as a good June, the summer crowds have gone, and the heavy autumn rain does not start until October, when the monthly total jumps from 49.9 mm to 114.5 mm.

The September point is worth spelling out, because an earlier draft of this very site got it backwards. September is not drier than June. It is wetter, 49.9 mm against 26.0 mm, nearly twice June's total, and its mean maximum of 27.4 C is higher than June's 26.3 C. What makes September the recommendation is that it keeps summer temperatures while the autumn rain is still holding off, and the academic year restart means the city is full again without being full of tourists. The first month of real rain, October, is the month the climate turns, not a gradual fade in late September.

If your dates are flexible and your interest is the city rather than the beach, the two shoulder months either side of the peak, May and September, are where the normals say the trade-off is best. The dedicated best time to visit Coimbra page expands this for families, festival-goers and budget travellers, and the Portugal-wide month question puts Coimbra in the national context.

Is Summer in Coimbra Too Hot for Sightseeing?

August is the hottest month, not July, with a mean maximum of 29.1 C against July's 28.5 C, and it averages 10.9 days above 30 C, the highest of any month. The record extreme at the same station is 41.2 C, recorded on 7 August 2016. Summer heat in Coimbra is real but manageable: mornings start at 15.6 to 15.7 C mean minimum, so early starts and a long siesta-shaped middle of the day are the standard pattern.

The July-versus-August inversion is the second thing guides get wrong here, after the September rain. People assume July is the peak month because it is the driest, and on rainfall it is, 8.9 mm, effectively no rain at all across the month on average. But IPMA's normals put August ahead on every temperature measure: mean, mean maximum and mean minimum, plus those 10.9 days at 30 C or above. If you dislike heat, August is the month to avoid, not July.

Coimbra's hills make this practical rather than abstract. The climb from the Baixa up to the Paço das Escolas is steep, shaded in parts and brutally exposed in others, and on a 30 C afternoon it is a different walk from the same route at 9 in the morning. The city's own rhythm already answers this: do the uphill, open parts early, keep the middle of the day for the covered interiors, the Sé Velha cloister, the Joanina Library's baroque rooms, a long lunch, and come back out for the riverside in the evening. A river perspective is the best hot-weather move of all, and the traditional boat trip on the Mondego is built exactly for it.

How Wet Is Winter in Coimbra, Really?

November is the wettest month at 121.5 mm, marginally ahead of October at 114.5 mm and January at 113.5 mm, and all three months average more than ten days with a millimetre or more of rain. Winter temperatures stay mild, with January's mean maximum at 15.0 C and its mean minimum at 5.2 C, and the station's record low is -4.3 C on 20 January 2017, so frost is rare rather than routine.

Coimbra's winter rain is Atlantic rain: frontal, persistent, occasionally heavy, and nothing like the brief thunderstorm model of the Mediterranean. The three wettest months together account for over a third of the annual 866 mm. But the temperature column is what surprises visitors from northern Europe: a January afternoon averaging 15.0 C means the city is walkable in a light jacket between showers, and the wettest days are grey rather than freezing. The rainy month question for Portugal is answered nationally, and Coimbra's version of the answer is November.

October's position near the top of that table is the useful warning. Early October often feels like summer's extension, and some days are, but the normals say the month as a whole carries 114.5 mm of rain and the mean maximum drops five degrees from September, from 27.4 C to 23.2 C. Anyone booking the first week of October on the strength of a late-September forecast is booking into the sharpest seasonal turn of the Coimbra year. Everything else covered here is indexed on Coimbra Travel Guide.

What Should You Pack for Coimbra, Month by Month?

Pack for two climates in one suitcase: summer weight from June to September, when mean maximums run 26.3 C to 29.1 C and rain is scarce, and layered waterproofs from October to March, when monthly rain tops 110 mm in three separate months. The one constant is walking: Coimbra's old town is steep and cobbled, so solid shoes with grip matter more in the rain than any umbrella, and the hills mean you warm up fast once you are moving.

The table below turns the IPMA normals into packing decisions. It is a planning guide, not a promise: normals describe the 1991 to 2020 average, and any individual week can run hotter or wetter than its month's average, so check a live forecast before you travel.

Two Coimbra-specific notes. First, the university hill funnels wind along the ridge, so a rain jacket beats an umbrella on the exposed stretches above the Baixa. Second, the same building can be cool inside and hot in the sun within minutes of each other, especially from May to September, which is why layers beat any single heavy garment. The Coimbra weather overview carries the annual summary if you want the short version.

Does the Weather Affect University and Library Visits?

Yes, mainly through the calendar rather than the forecast: the University of Coimbra closes its visitor circuit entirely on 24 May and on 4 October, and on the late-December holiday dates, while the Biblioteca Joanina admits a maximum of 50 people every 20 minutes inside a timed slot that is printed on the ticket and enforced. Weather itself rarely closes anything, but summer demand fills Joanina slots, and the 29.1 C August afternoons make the unshaded parts of the Paço das Escolas hard work.

The 50-per-20-minutes ceiling is the single most practical fact about visiting Coimbra, and it interacts with the climate directly. In July and August, when the city is hot and the tourist flow is at its peak, the library's timed slots sell out first, and the time printed on your combined ticket is the library slot specifically, not a general entry time. Entry outside the printed slot is refused, and online purchase closes 20 minutes before the visit. The Joanina Library tickets and University tickets pages give the full ticket mechanics, including the 16.50 EUR combined ticket that contains the library.

For weather specifically, the practical pattern is to book a morning Joanina slot in summer, both for the slot availability and because the library's historic rooms are at their calmest before the midday heat builds. A guide also solves the sequencing problem for you, which matters when you are working around a fixed library time.

What Are the Record Extremes for Coimbra?

The Coimbra / Bencanta station's record extremes are 41.2 C, recorded on 7 August 2016, and -4.3 C, recorded on 20 January 2017. Both sit far outside the monthly normals: August's mean maximum is 29.1 C, so the record day ran twelve degrees above the average hottest day, and January's mean minimum is 5.2 C, so the record night was nearly ten degrees below it. Extremes like these are rare, but they define the realistic bounds of what the city can produce.

For a visitor, the extremes matter less as a forecast than as a planning boundary. A heatwave in early August can put the city over 40 C, and IPMA's normals say August already averages 10.9 days above 30 C, so a hot-year August is the one scenario where shifting plans indoors, to the museums, the library slots and long lunches, becomes the whole day's structure. On the cold side, a January night at -4.3 C is a genuine outlier, but the mean minimum of 5.2 C means evenings from November to February regularly want a proper coat, especially on the riverfront where the air moves.

One closing note on sources. Every temperature and rainfall figure on this page is from IPMA's 1991 to 2020 normals for the Coimbra / Bencanta station, version 1.0 of 2024, which is the Portuguese state meteorological service's official series for this city. The district of Coimbra reaches the Atlantic at Figueira da Foz, and coastal figures are a different place. Where a competing guide quotes a different number for "Coimbra weather", check which station and which period it used, because the answer changes with both.

Common Questions About Coimbra Weather by Month

Whatever month you choose, the normals say the same thing: Coimbra rewards a morning start, a covered middle of the day and a riverside evening, and the only real mistake is arriving in October or November without a rain layer.