Paris in October: 17°C afternoons, 10°C mornings, ~8 rain days, plane-tree leaves underfoot by mid-month.
October is the month Parisian women look their best. The weather justifies the wool coat they have been waiting for, the light drops to low-angle gold, and the whole city shifts from cotton to wool in a single weekend. Météo-France records 17°C afternoons, 10°C mornings, ~8 rain days, and 10h 45m of daylight — short enough that dinners start after dark. The wool overcoat is not optional; it is the coat that carries the outfit. Underneath it Parisians wear chunky cream knits over collared shirts, plaid midi skirts with opaque tights, and cognac ankle boots that match either. Nuit Blanche on the first Saturday is the tell that October has started.
October is the month Parisian women look their best — the coat does the work.

The October anchor. Mid-length to below-knee, raglan or dropped shoulder, single-breasted. Camel reads conservative-Parisian, charcoal reads Left-Bank intellectual. Max Mara, Toteme, The Frankie Shop, or a vintage find on rue de Charonne.

Worn over a collared shirt with the collar poking out — Caroline de Maigret's most-copied formula. Merino, alpaca, or cashmere if the budget allows. Oversized but not sloppy; the shoulder seam should sit past your actual shoulder.

Same pair from September, worn with the ankle boots and the overcoat open. Cobblestone-tested, wool-compatible. In October they pair with the knits, not with tees.

Earns its place a second month running. With opaque tights in October it reads autumn-finished; paired with the cognac boots and a black scarf, it is the look Jeanne Damas has built a brand on.

The layer under the knit, collar and cuffs visible. Fine-gauge cotton, pale grey reads more refined than pure white against October's low-angle light. Tucks into the midi skirt for evening without the knit — two-piece formula, one shirt.

The single shoe that handles October. Low block heel, pointed or rounded toe, leather sole with a rubber half-sole added (the Paris cobbler trick). Reads polished with the skirt, easy with the jeans.

Navy, charcoal, or burgundy. Big enough to wrap twice, not so bulky it fights the overcoat's collar. Hermès if you have one, Acne Studios if you don't, a vintage shop in the 11th if neither.

October swaps the burgundy crossbody for something the city-commuter uses — a Longchamp Le Pliage or the structural dark-navy nylon-and-leather variant. Big enough for a notebook, small enough not to read tote-tourist. The bag Parisian women carry when they will be walking the Fashion Week sidewalk for four hours.
Chunky cream knit over a white collared shirt · straight-leg jeans · cognac ankle boots · wool scarf · overcoat open · crossbody. Flat white at Télescope in the 1st, walk through the Tuileries before the leaves are fully down.
White shirt tucked into the plaid midi skirt · chunky knit under the overcoat · opaque tights · ankle boots · crossbody. 8pm Nuit Blanche opening, then a bistrot in the 10th; the coat stays on.
A suggested look — Oversized double-breasted tartan blazer in autumn red, Crew neck charcoal grey sweatshirt with vintage graphic print, High-rise wide-leg cream denim jeans, Chunky-sole buckle loafers in dark brown leather with retro silhouette.

Cool, greying, rainy but survivable. Météo-France records 17°C afternoons against 10°C mornings, around 8 rain days, and 10h 45m of daylight at mid-month. By the third week the plane-tree leaves are underfoot and the temperature drops toward 8°C at night. The wool coat is working daily.
Not a winter-weight parka — a wool overcoat in camel or charcoal is the right weight. It handles 10°C mornings and the 8°C evening drop without overheating at lunch. Save the heavy wool or down for December onward. The October overcoat should close but not feel like armor.
One pair of cognac or dark-brown leather ankle boots with a low block heel, and one backup flat (leather loafer or ballet) if there is room. Skip sneakers — the wet plane-tree leaves make them slip, and the locals wear leather soles. Ask any Paris cobbler to add a rubber half-sole to leather boots before the trip; the cobblestone grip doubles.
Style-wise, the best. The light drops to a low-angle gold, the summer crowds are gone, and Parisian women are dressed in their most-photographed pieces — wool overcoats, chunky knits, plaid skirts, ankle boots. Weather-wise, bring the coat and expect ~8 rain days. The tradeoff is worth it.
The first Saturday of October, Paris hosts an all-night contemporary arts festival. Museums stay open, installations appear along the Canal Saint-Martin and across the 10th, and people walk the city from midnight to 4am. The dressing code is daytime-appropriate wool — the same coat you wore at noon still works at 2am. A wool scarf and ankle boots are non-negotiable; temperatures drop below 10°C by midnight.