Map from Google - Lourdes

Lourdes, French town at the foot of the Pyrenees, located at 400 metres above sea level, has a temperate climate, influenced by the ocean. The average temperature of January is 4.5 °C, that of August is 19 °C.
Here are the average temperatures.
Average temperatures - Lourdes
LourdesJanFebMarAprMayJunJulAugSepOctNovDec
LourdesJFMAMJJASOND
Min (°C)0135912141411831
Max (°C)9101415192323242218129

In an average year, about 1,000 millimetres of rain fall, well distributed throughout the year, although the relatively driest season is summer. July is the driest month, November the wettest.
Here is the average precipitation.
Average precipitation - Lourdes
LourdesJanFebMarAprMayJunJulAugSepOctNovDecYear
LourdesJFMAMJJASONDY
Prec. (mm)85807585958050808585110951005
Days141313151512101111121313152

The wind is quite common, and can increase the sensation of cold.

Winter, from December to February, is relatively mild. At night the temperature is normally around freezing, while during the day it's about 10 °C. However, there may be variations depending on the weather situation: cold winds from the north or east can bring snowfall and frost; for instance in February 2012 the temperature dropped to -11 °C. On the other hand, when the winds blow from the ocean, the temperature gets milder, though with quite frequent rains.

Spring, from March to May, is cool and quite rainy. The temperatures can change quickly, and the first mild or even warm days, alternate with quite cold days.

Summer, from June to August, is mild or pleasantly warm, with cool nights. In periods of good weather, during the day it can get hot: the temperature can reach and exceed 30 °C. Very hot days are rare, but sometimes it can get to 35 °C and more. In the afternoon, thunderstorms may erupt, usually of short duration, while some occasional Atlantic disturbances can bring some cool and rainy days, even in mid-summer. In the end, between Atlantic fronts and afternoon thunderstorms, even in summer it rains on average for 10/12 days per month.

Autumn, from September to November, is initially mild, in fact in September there may still be some summery days. But with each passing week, it gradually becomes cooler, and cloudy and also rainy.

The amount of sunshine in Lourdes is good in the summer, and acceptable in spring and in September, while in the rest of the year it's quite low, given that cloudy days prevail, especially from November to February.

Lourdes

When to go

The best time to visit Lourdes runs from June to September, being the warmest and driest of the year. Also May and October, though rainier, may be fine, although sometimes it can get cold, especially in the first half of May and the second of October. Those who cannot stand the heat, to avoid the albeit rare hot days, can choose May, September and October.