Late in the afternoon, Carhaix-Plouguer finally gets a break: after hours of steady rain and thick clouds, the sun pushes through for a short while. For locals, this brief brightness is a welcome change after a day spent under grey skies and damp air.
The morning starts with a solid layer of cloud cover. Temperatures sit around 14°C at dawn and barely rise as the morning goes on. The air feels heavy with humidity, and a southwest wind, steady at 10 to 15 km/h and gusting up to 30 km/h, keeps things unsettled. Sunlight doesn’t appear until well into the afternoon. Regional meteorological reports note that this persistent cloudiness and cool air match the broader weather pattern across Brittany in mid-September 2026, when Carhaix-Plouguer saw highs of about 20°C and the region generally ranged between 18 and 24°C.
By midday, the weather turns wetter. A steady drizzle sets in, then builds to moderate rain. The wind shifts from southwest to northwest and picks up to 15 to 20 km/h, with gusts reaching 40 km/h. Temperatures climb to 17 to 19°C, but the dampness sticks around. As the afternoon goes on, the rain lets up and the sky opens a little, letting in some light. Météo-France described Brittany as moving into a cooler, more changeable stretch after a warm start to September, with more wind and lingering humidity as weather fronts crossed the northwest of France.
Evening brings a short-lived calm. Temperatures start near 18°C and drop to 14°C by nightfall. The sky clears a bit, then clouds over again before clearing once more late at night. Winds from the northwest blow at 20 km/h with gusts up to 35 km/h, but gradually ease and turn west, dropping to a light 5 km/h. Humidity rises again, setting up a damp night. This fits the pattern seen in the days around September 17, with forecasts pointing to ongoing unsettled weather and no quick return to stable conditions.
Overnight, things quiet down. Temperatures fall to between 10 and 12°C, with the lowest readings just before dawn. Winds stay light, shifting from southwest to west-southwest, rarely topping 5 km/h, and gusts remain modest at about 10 km/h. The sky alternates between clear and cloudy, but thick clouds return by sunrise. Humidity stays high through the night.
The next day offers little change. Early morning temperatures start at 10 to 11°C, rising to 20 to 21°C by afternoon. Winds begin weak from the southwest, then strengthen and turn west, reaching 15 km/h with gusts up to 35 km/h. The sky stays mostly overcast, with only a brief thinning of clouds around midday before thickening again later. Forecasts from Ouest-France describe the lack of lasting improvement and steady, moderate temperatures as typical of the unstable air masses still affecting the region.
For Carhaix-Plouguer, the day is a reminder of how quickly Brittany’s weather can shift. Anyone heading outside will need to be ready for changing conditions, with rain gear and flexibility impressive.
