Climate averages 1991–2020
Boulogne-Billancourt weather
in August.
A warm, moderately wet month: the warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Boulogne-Billancourt: daytime highs average 24.2°C and nights cool to about 15.2°C. By daytime temperature it is the warmest month of the year.
Expect about 56 mm of rain on roughly 9 days, which makes August a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 22 min on an average August day.
The nearest other city in this atlas is Paris 15 Vaugirard (4 km away). In August its highs average 24.3°C, about as warm as Boulogne-Billancourt, with 56 mm of rain.
Among the 57 cities listed in France, Boulogne-Billancourt ranks joint 34th of 57 for the warmest August highs and joint 22nd of 57 for the driest August (rainfall, lowest first). The mean August high of those 57 cities is 25.0°C; Boulogne-Billancourt is 0.7°C cooler than that mean.
From August to September, average highs fall by 3.6°C to 20.7°C, and monthly rainfall falls from 56 mm to 47 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Boulogne-Billancourt climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.3°C2.3°C | 2.3°C | 52 | 11.3 | 8.89 h |
| February | 8.4°C2.1°C | 2.1°C | 48 | 10.0 | 10.110 h |
| March | 11.9°C4.0°C | 4.0°C | 50 | 10.5 | 11.912 h |
| April | 15.1°C6.3°C | 6.3°C | 50 | 10.6 | 13.714 h |
| May | 18.6°C9.9°C | 9.9°C | 66 | 11.3 | 15.215 h |
| June | 21.8°C13.1°C | 13.1°C | 57 | 10.6 | 16.116 h |
| July | 24.1°C15.2°C | 15.2°C | 55 | 9.4 | 15.716 h |
| August, selected | 24.2°C15.2°C | 15.2°C | 56 | 9.0 | 14.414 h |
| September | 20.7°C12.3°C | 12.3°C | 47 | 8.3 | 12.613 h |
| October | 16.1°C9.5°C | 9.5°C | 62 | 11.2 | 10.911 h |
| November | 10.8°C5.6°C | 5.6°C | 58 | 11.3 | 9.29 h |
| December | 7.7°C2.9°C | 2.9°C | 68 | 12.5 | 8.38 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Paris 15 Vaugirard in AugustFrance · 4 kmHigh 24.3°C · Low 15.0°C · 56 mm rain
- Paris in AugustFrance · 8 kmHigh 24.3°C · Low 14.8°C · 56 mm rain
- Paris 13 Gobelins in AugustFrance · 8 kmHigh 24.3°C · Low 14.8°C · 56 mm rain
- Versailles in AugustFrance · 9 kmHigh 23.5°C · Low 14.4°C · 56 mm rain
- Paris 20 Ménilmontant in AugustFrance · 12 kmHigh 24.0°C · Low 14.5°C · 56 mm rain
- Argenteuil in AugustFrance · 13 kmHigh 24.2°C · Low 14.9°C · 57 mm rain
- Créteil in AugustFrance · 17 kmHigh 24.3°C · Low 15.0°C · 56 mm rain
- Saint-Quentin-en-Yvelines in AugustFrance · 18 kmHigh 23.4°C · Low 14.2°C · 58 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Boulogne-Billancourt) is explained once on the Boulogne-Billancourt year overview and on the Sources, method and limits page.
Paris, Paris 15 Vaugirard and Paris 13 Gobelins lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.