The short answer
The Seine can be cruised all year, because boats run in every season with winter timetables. Summer from June to September is the warmest. Evening is the best time for lights, and darkness falls earlier in winter, which makes the Eiffel Tower sparkle easier to catch. Daytime suits architecture and photos of the bridges.
There is no single best month. Choose by purpose: warmth, light, events or timetable. The sections below set out each one. The weather figures are long-term averages, not a forecast.
Weather by month
Monthly averages for Paris from 1991 to 2020 (Paris-Montsouris station). Highs and lows are averages of the daily values.
| Month | High °C | Low °C | Rain mm |
|---|---|---|---|
| January | 7.6 | 3.2 | 47.6 |
| February | 8.8 | 3.3 | 41.8 |
| March | 12.8 | 5.6 | 45.2 |
| April | 16.6 | 7.9 | 45.8 |
| May | 20.2 | 11.1 | 69.0 |
| June | 23.4 | 14.2 | 51.3 |
| July | 25.7 | 16.2 | 59.4 |
| August | 25.6 | 16.0 | 58.0 |
| September | 21.5 | 13.0 | 44.7 |
| October | 16.5 | 9.9 | 55.2 |
| November | 11.1 | 6.2 | 54.3 |
| December | 8.0 | 3.8 | 62.0 |
Rain falls in every month, so no season is dry. September is still mild, with a daily high of 21.5 °C on average.
Seine cruises for every season
Day and evening cruises on the Seine, with live prices and availability.
Boat timetables by season
Operators shorten and thin out their timetables in winter. Dates below are for 2026.
| Service | Period | What runs |
|---|---|---|
| Bateaux-Mouches | April to October | Daily 10:00 to 22:00, every 30 minutes, plus 22:30 on Saturdays in October |
| Bateaux-Mouches | November to March | 10:15 to 21:30, every 45 minutes; holidays differ |
| Bateaux Parisiens | 28 September to 1 November | From 10:00, last at 22:00 (22:30 Friday and Saturday) |
| Bateaux Parisiens | 2 November to 18 December | Single departures from 10:30 to 21:40 Monday to Thursday, last at 22:00 on Friday |
| Batobus | 1 October to 1 November | Daily 10:00 to 19:00 |
| Batobus | 2 November to 31 March 2027 | Monday to Thursday 10:00 to 17:00, Friday to Sunday 10:00 to 19:00 |
Batobus times are the first and last departure at the Tour Eiffel, not at every stop. It has no night service. For a hop-on pass see the Batobus guide.
Evening, sunset and the sparkle
After dark the Eiffel Tower sparkles for 5 minutes at the start of every full hour. If darkness falls at 7:40 p.m., the first sparkle is at 8 p.m. In winter darkness comes earlier, so the first sparkle is earlier too. The last sparkle falls between 11 p.m. and 1 a.m. depending on the season.
Exact sunset times depend on your date, so look them up for the day you travel. A cruise that leaves in the last hour of daylight shows you the bridges in the evening light and the lit city after dark. Dinner cruises start early or late: Bateaux Parisiens runs 6:15 p.m. to 7:30 p.m. and 8:30 p.m. to 11 p.m., and its autumn and winter menu is valid from 14 October 2026 to 6 April 2027. More in the night cruise guide.
Seasonal events and sights
Some riverside attractions run only in summer.
Swimming in the Seine
The three supervised bathing sites, Bras Marie, Grenelle and Bercy, opened from 4 July to 30 August 2026, free of charge. For Grenelle a local notice gives 20 September, and the 2026 season has ended. There is no year-round swimming. Check the 2027 dates before a summer trip. See the swimming guide.
Paris Plages
The 2026 edition ran from 4 July to 30 August along the river banks, with free access. The next edition is in 2027. See the riverbanks guide.
Giverny
Monet's garden is open only from 1 April to 1 November in 2026. See the Giverny guide.
Navigation in summer
From 4 July to 30 August 2026 special navigation rules applied around the bathing sites.
High water and floods
When the Seine runs high, operators can change what they do. The Bateaux-Mouches captain can adapt the route to the water level, and Bateaux Parisiens names exceptional navigation restrictions set by the authorities. There is no single water level at which all boats stop.
On foot, the Rives de Seine park lies in a flood risk zone. Closures ordered by the city or the police prefecture must be followed. For swimmers the city names a river flow of 400 m³/s as dangerous, which is not a limit for cruise boats. If the river is high on the day you travel, check the operator's page the same morning before you head to the pier.
Plan the rest of your trip
Guides that pair with the season.
Best time for a Seine cruise: frequently asked questions
What is the best month for a Seine cruise?
There is no single best month. June to September is the warmest, with daily highs of 23.4 to 25.7 °C in June to August. September is mild at 21.5 °C. Winter has thinner timetables but still runs boats.
Are Seine cruises open in winter?
Yes. Bateaux-Mouches runs every 45 minutes from November to March, and Bateaux Parisiens has a winter timetable in 2026. Batobus runs on a reduced timetable from 2 November.
Is it better to cruise by day or at night?
That depends on what you want to see. Day is better for architecture, evening for the lights and the Eiffel Tower sparkle. A departure in the last hour of daylight can give you both.
When does the Eiffel Tower sparkle?
For 5 minutes at the start of every full hour after dark. The last sparkle is between 11 p.m. and 1 a.m., depending on the season.
Do cruises stop when the Seine floods?
Operators can change the route or follow restrictions set by the authorities. There is no single water level for all boats. Check the operator's page the morning you travel.
Can I swim in the Seine?
Only at the supervised bathing sites in summer. In 2026 they opened from 4 July to 30 August. Outside the sites and their hours, swimming is banned.