What Is the Rainy Month in Portugal?

Coimbra, the university city on the River Mondego in central Portugal, has a rain pattern most visitors misjudge: the wet month is not the one they expect, and the dry stretch is longer than they think. The figures below come from IPMA's official 1991 to 2020 climate normals for the Coimbra / Bencanta station, number 707, the city's own station about 3 km from the centre. That matters because the district of Coimbra reaches the Atlantic and the city does not, so a coastal weather table describes a different place. This page answers the question directly, month by month, for the city itself.

What Is the Rainy Month in Portugal?

For Coimbra, the rainiest month is November, with 121.5 mm of rain on the official IPMA 1991 to 2020 normals for the city's own Bencanta station, marginally ahead of October at 114.5 mm and January at 113.5 mm. November also averages 11.5 days with at least 1 mm of rain, the highest count of the year. At the other end, July is effectively dry at 8.9 mm, and the whole summer from June to September stays comparatively dry.

Those three months, November, October and January, are close enough that any of them can feel like the wettest in a given year. The normals are thirty-year averages, and individual years swing around them. What does not swing is the shape of the curve: Coimbra's rain is autumn and winter rain, concentrated between October and March, with a genuinely dry core in June, July and August. If a single month has to carry the label, November takes it, and the record at the same station backs the point with a low of -4.3 C recorded on 20 January 2017, a reminder that winter here is a real season, not a damp footnote.

The practical reading is simpler than the numbers. A visitor planning around rain should treat October through December as the stretch most likely to deliver wet days, and treat July as the month where rain is close to a non-event. The rest of this page breaks the year down and then looks at what the pattern means for planning, including one genuinely counterintuitive fact about September that most guides get backwards.

How Much Rain Does Each Month Bring to Coimbra?

The official IPMA table for the Coimbra / Bencanta station shows rain falling on 94 days with at least 1 mm across an average year, totalling 866 mm, with the three wettest months being November at 121.5 mm, October at 114.5 mm and January at 113.5 mm, and the three driest being July at 8.9 mm, August at 14.8 mm and June at 26.0 mm. The full monthly picture looks like this.

Two things jump out of the table. First, the wet season arrives abruptly: September's 49.9 mm more than doubles to October's 114.5 mm in a single step. Second, spring is steadier than people assume, with April actually wetter than March at 84.6 mm against 75.4 mm. The monthly detail, including what the rain does to temperatures and crowds across the whole year, is covered in the Coimbra weather by month guide, and the broader seasonal picture sits in the companion piece on the rainy season in Portugal.

For anyone weighing this against other times of year, the comparison with the best month to visit Portugal usually comes down to a trade between rain and crowds rather than rain and comfort. Winter rain in Coimbra comes with mean maxima of 15 to 16 C, which is mild by northern European standards.

When Does the Rainy Season Start and End in Coimbra?

The rainy season in Coimbra runs from October through March, opening sharply when the monthly total jumps from 49.9 mm in September to 114.5 mm in October, and closing when the same figures fall from 84.6 mm in April to 64.7 mm in May and then 26.0 mm in June. October, November, December and January are the four wettest months of the year on the official table, making that four-month block the sustained wet period.

The start is the sharper edge. September is still a summer-adjacent month on the rain gauge, and October is a winter month on it; the transition happens in weeks, not gradually across the autumn. The end is gentler, tapering through April and May before June effectively switches the tap off. A visitor catching either shoulder month should pack for both regimes: April averages more than 10 rain days at 1 mm or more, yet still reaches a mean maximum of 20.5 C. Other pages covering the same trip are gathered on Coimbra Travel Guide.

This shape has a planning consequence worth stating plainly. The dry window, June through September, is four months long, and the wet window, October through March, is six. Coimbra is not a city with a brief rainy spike; it has a long wet half-year with a dry season nested inside it. Anyone visiting outside the dry window will meet rain days, but they will also meet mean maxima between 15 and 23 C, so the rain is rarely accompanied by real cold.

Is September Really Drier Than June in Coimbra?

No, and this is the fact most guides get backwards: September in Coimbra is both wetter and warmer than June, with 49.9 mm of rain against June's 26.0 mm, and a mean maximum of 27.4 C against June's 26.3 C, on the official IPMA 1991 to 2020 normals. September gets nearly twice June's rain. What makes it the quiet recommendation is that the autumn rain holds off until October, when the monthly total jumps to 114.5 mm, and that the summer crowds have gone.

The honest framing is that September sits in a comfortable middle: wetter than the three core summer months, dramatically drier than everything from October onwards, and warmer on average than June. Its 5.2 days of measurable rain sit between summer's near-zero counts and October's 10.3.

For a traveller choosing between June and September, the decision is really about heat and crowds rather than rain. June is drier and slightly cooler; September is warmer, wetter by a modest margin, and much quieter. Neither month carries a serious rain risk by the standards of the wet half-year.

What Can You Do in Coimbra on a Rainy Day?

Coimbra has enough indoor depth to absorb a wet day: the Biblioteca Joanina runs timed visits inside the 16.50 EUR combined university ticket, the Sé Velha charges 3.00 EUR for its Romanesque interior, the Mosteiro de Santa Cruz charges 5.00 EUR, and a live fado show with a glass of port wine runs about 50 minutes indoors. The one thing to check first is the Museu Nacional de Machado de Castro, which is closed for conservation work and has no published reopening date.

The library is the headline indoor option, and it carries the city's one genuine scarcity fact: the University's own visit page limits entries to 50 people every 20 minutes, and the time printed on the ticket is the library slot specifically, with entry outside the slot refused. Rain increases demand for indoor slots, so a wet-day visit is exactly the scenario where booking ahead matters. The rest of the combined ticket, the Royal Palace, the Capela de São Miguel and the science spaces, is valid for two days around that fixed slot, which suits a trip built around unpredictable weather.

The Machado de Castro warning is worth repeating because the museum is the obvious rainy-day answer in every older guide. Its own page on the national Museus e Monumentos portal states it is closed for conservation work, twice, even though the same page prints a normal-looking opening table below the closure line. Those hours belong to whenever it reopens. The building does sit above a Roman cryptoporticus of the mid-1st century, which is a good reason to watch for its reopening rather than a reason to plan around it today.

A guided walk is the third wet-day option, with a caveat: Coimbra's hills mean rain and steep cobbles together, so a guide who knows the covered shortcuts and the indoor stops along the way turns a soggy afternoon into a structured one. The Coimbra Top Attractions Walking Tour covers the old town and the university hill in two and a half hours, rated 5 from 151 reviews and priced from $5.85 per person, and it runs whatever the sky is doing. Check availability

Whatever the month, a guide makes the difference between seeing Coimbra's rain-affected streets as a problem and seeing them as atmosphere. The trio below covers the city's core sights, the university's timed interior and the river itself, and each one runs year-round.

Common Questions About Rain in Coimbra

What is the rainy month in Portugal?

For Coimbra, it is November, with 121.5 mm of rain on the official IPMA 1991 to 2020 normals for the city's own station, marginally ahead of October at 114.5 mm and January at 113.5 mm. Portugal's climate varies by region, but in the university city on the River Mondego the wettest stretch is October through December.

What is the driest month in Coimbra?

July, at 8.9 mm of rain and only 1.7 days with measurable rainfall on average. August is nearly as dry at 14.8 mm. The three core summer months, June, July and August, are the reliable dry window.

Does it rain all day in Coimbra in winter?

Not usually. Winter months average 11 to 12 days with at least 1 mm of rain, which leaves most days dry or mostly dry, and mean maxima of 15 to 16 C in December and January. Rain tends to arrive in periods rather than settling in for whole days.

Is October a bad month to visit Coimbra?

October is one of the two wettest months, at 114.5 mm, but it comes with a mean maximum of 23.2 C and thinner crowds than summer. It suits a visitor who packs a rain layer and values quiet over dryness.

Is September a rainy month in Coimbra?

Not by the standards of the wet half-year. September averages 49.9 mm, nearly twice June's 26.0 mm but less than half of October's 114.5 mm. It is a warm, comparatively quiet month, with a mean maximum of 27.4 C, higher than June's.

The pattern, in one line: pack for rain from October to March, expect a genuinely dry June to September, and if one month must be named the rainy month in Coimbra, Portugal, it is November, at 121.5 mm on the city's own official climate record.