Almost every page about when to visit Rome describes the same year: spring and autumn good, summer hot and crowded, winter cheap and quiet. It is not wrong. It is also not worth reading, because it does not tell you the one thing about Roman seasonality that is genuinely counterintuitive.
Rome's museums and Rome's tourists peak at different times of year, and the gap is the Italian school calendar.
Two curves that disagree
| Month | Lazio museums | Arrivals in Rome | Foreign share | What that means |
|---|---|---|---|---|
| January | 77 | 67 | 62% | The floor of the year, on both counts |
| February | 85 | 77 | 66% | Still low. Cold and wet, but the room is yours |
| March | 109 | 95 | 67% | Museums rise before hotels do. School trips |
| April | 137 | 105 | 74% | Museum peak. Easter, two national holidays, coach parties |
| May | 123 | 118 | 73% | The best month, and the one we would pick |
| June | 116 | 117 | 75% | Busy on both curves, and warm rather than hot |
| July | 99 | 118 | 77% | Arrivals peak, museums empty out. Heat and no schools |
| August | 100 | 102 | 81% | Hottest and most foreign. Romans have left |
| September | 105 | 112 | 79% | The second good month, better in its last two weeks |
| October | 105 | 117 | 78% | Still busy, and the rain starts |
| November | 74 | 91 | 67% | Wettest month of the year, and calm |
| December | 71 | 80 | 61% | Museum minimum. Short days, closed on the 25th |
Look at April and July. The museums of Lazio are at 137 in April and 99 in July, a swing of nearly forty per cent, while arrivals move the other way. That is Italian schools: April is coach parties and free-entry days, July is families who have already left the city.
If you are coming from abroad, follow the arrivals curve, not the museum one. It tells you what the streets, the restaurants and the queues will feel like. But remember what the museum curve tells you about April: you will be sharing time slots with organised school groups, and the Pantheon admits up to twelve hundred people per hour.
Three different questions, three different answers
There is no single best month, because the things you might be optimising for do not peak together. Pick the row that matches what you care about.
| Month | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable weatherMay and September sit between the winter rain and the July heat. August averages 31.6 C by day and has hit 40. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Fewer peopleThe quiet months are the wet ones. November brings 112.8 mm and nine rain days; you get the room almost to yourself. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| The sunbeam on the floorThe beam from the oculus only reaches the pavement between 3 May and 11 August, around one in the afternoon. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Long evenings outsideSunset passes 19:00 on 29 March and falls back below it on 28 September. In December the sun is down by 16:42. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Weather from WMO climate normals 1991-2020, Rome Ciampino. Crowds from the arrivals index above. Beam dates calculated from solar geometry.
The climate, from the actual normals
Nearly every travel site publishes Rome temperatures without saying where they were measured or over what period, which makes them impossible to check. These come from the WMO standard climate normals for 1991 to 2020, station Rome Ciampino, which is Italy's official submission and is stable until 2031. It is the same source the one rigorous weather site uses, and it is free.
| Month | Max C | Min C | Rain mm | Rain days | Sun h/day |
|---|---|---|---|---|---|
| January | 12.0 | 3.4 | 68.4 | 7.8 | 4.3 |
| February | 13.0 | 3.4 | 65.4 | 7.7 | 5.5 |
| March | 15.8 | 5.9 | 62.0 | 7.2 | 6.1 |
| April | 18.8 | 8.6 | 74.4 | 8.1 | 7.0 |
| May | 23.4 | 12.6 | 61.6 | 6.0 | 8.8 |
| June | 28.1 | 16.7 | not submitted | not submitted | 9.9 |
| July | 31.0 | 19.3 | not submitted | not submitted | 10.9 |
| August | 31.6 | 19.8 | not submitted | not submitted | 10.3 |
| September | 26.7 | 16.0 | 67.6 | 6.3 | not submitted |
| October | 22.2 | 12.4 | 91.8 | 7.7 | 6.3 |
| November | 16.9 | 8.5 | 112.8 | 9.3 | 4.6 |
| December | 12.7 | 4.7 | 102.5 | 10.0 | not submitted |
Those gaps are not ours. Summer rainfall for Ciampino is recorded as missing in Italy's official submission to the WMO, and we would rather show you a hole than quietly patch it with a number from a different station or a different thirty years. For what it is worth, summer rain in Rome is slight and usually arrives as a short thunderstorm.
Two figures the table does not carry. Ciampino averages 57.8 days a year above 30 C, most of them in July and August, and has recorded 40.0. And Ciampino is thirteen kilometres out and 129 metres up: the historic centre runs warmer. Italy's environmental agency measures the city-centre station at 17.8 C mean annual temperature against Ciampino's 16.0, and 787 mm of rain against Ciampino's 623. The Pantheon is in the warmer, wetter one.
November
The wettest month is also the best-kept one
November brings 112.8 mm across nine or ten rain days, more than any other month, and the arrivals index falls to 91. Those two facts are related and they are worth a thought.
Rain does not close the Pantheon. It has never closed for weather; the only two days it shuts are Christmas and New Year's Day. Rain does come through the building, since the oculus has no glass, and watching a column of water fall forty-three metres onto a marble floor is a better experience than most things you can queue for in May.
Bring a jacket rather than an umbrella. Wet sampietrini are slippery and the wind in the squares turns umbrellas inside out.
Daylight, and the closing time
The Pantheon closes at 19:00 all year, which means the same closing time falls in completely different light depending on the month.
- 21 December: sunrise 07:34, sunset 16:42. The monument closes two and a quarter hours after dark.
- 21 March: sunrise 06:12, sunset 18:23. It closes just after dusk.
- 21 June: sunrise 05:35, sunset 20:49. It closes in full daylight, with two more hours of evening outside.
- 21 September: sunrise 06:56, sunset 19:09. It closes nine minutes before sunset.
The threshold to remember: sunset passes 19:00 on 29 March and drops back below it on 28 September. Outside that window you will be leaving the Pantheon into the dark, and the square is worth seeing lit. Note that the March date is the clock changing, not the sun: Italian summer time runs from the last Sunday in March to the last Sunday in October.
The Italian dates that catch visitors out
| When | What | Why it affects you |
|---|---|---|
| Easter and Easter Monday | 28 March 2027, 16 April 2028 | The single busiest stretch for museums. Pasquetta is a public holiday |
| 21 April | Rome's birthday | City-wide events, and the day the oculus beam crosses the doorway |
| 25 April and 1 May | Liberation Day, Labour Day | Two public holidays ten days apart. Many Italians take the whole bridge |
| Pentecost | 16 May 2027, 4 June 2028 | Rose petals dropped through the oculus after the 10:30 Mass. Free, unbookable, arrive very early |
| 15 August | Ferragosto | Rome empties of Romans; shops and restaurants close. The Pantheon stays open |
| First Sunday of the month | Twelve times a year | Free entry, nothing bookable, one queue for everyone |
Ferragosto deserves a sentence of its own, because the advice about it is usually wrong. Yes, Romans leave. No, that does not make the centre quiet: the foreign share hits 81 per cent in August, its annual maximum. What empties is the neighbourhood life, not the monuments. You get the tourist city without the city.
Choosing a month
What is the best month to visit the Pantheon?
May, or the second half of September. Both give you comfortable temperatures, long daylight and the sunbeam still reaching or nearly reaching the floor, without April's school groups or July's heat.
Is August a bad time to visit Rome?
It is the hottest month, averaging 31.6 C by day, and the most foreign at 81 per cent. Romans leave and much of the neighbourhood economy shuts. The monuments stay open and the light is still good, but you will be doing it in the heat.
When is the Pantheon least crowded?
November through February, which is also when it rains most. December has the lowest museum attendance of the year. If you do not mind a jacket, that is the trade.
Does the Pantheon close when it rains?
No. It has never closed for weather. The only two closures in the year are 25 December and 1 January. Rain falls through the oculus onto the floor and drains away, which is worth seeing.
How hot does Rome actually get?
The official normal for August is a 31.6 C average maximum, with 57.8 days a year above 30 C and a recorded maximum of 40.0 at the Ciampino station. The city centre runs about 1.8 C warmer than that station on the annual mean.
There is one hour that only works in summer
Between early May and mid-August the sunbeam from the oculus reaches the floor, around one in the afternoon. The rest of the year it is on the wall.
Data verified on. Climate from WMO normals 1991-2020, Rome Ciampino, via NOAA. City-centre comparison from ISPRA. Museum and arrivals indices from the Ministry of Culture and ISTAT. Sunrise and sunset from USNO.