What to Wear in Reykjavik in September: Packing for Iceland’s Autumn

The Layering Principle: Your Core Strategy

Layering is the only sensible approach for Reykjavik in September. Because you will move between heated indoor spaces and chilly outdoor experiences, wearing three adaptable layers lets you regulate your temperature without carrying a bulky load.

Think of your outfit as a system: a moisture-wicking base layer on your skin, an insulating mid layer like wool or fleece, and a waterproof shell on top. This setup also makes it easy to peel off a layer if the sun breaks through or add one when you stop moving during a tour. For a full rundown of this approach, check the Reykjavik packing list for the island’s signature season-by-season layering system.

Base Layers: Starting Right

Your first layer should be a snug, non-cotton top in merino wool or a synthetic fabric that wicks sweat away from your skin. Avoid cotton at all costs: once it gets damp from rain or perspiration, it loses all insulating ability and leaves you feeling cold, a rule that becomes even more critical in Iceland’s windy conditions.

Merino wool is a top choice because it manages moisture well and resists odor, making it ideal for multi-day travels. If you prefer synthetics, look for lightweight, quick-drying options that fit comfortably under your mid layers.

For your lower half, consider thermal leggings or long underwear under your pants. They add critical warmth without much bulk, which is helpful when a crisp morning turns into a blustery afternoon.

Mid Layers: Wool and Fleece for Warmth

Your main insulating layer in September should be a wool sweater or a fleece jacket, both of which perform well in damp, cool conditions. Wool has the edge for odor resistance and natural warmth, while fleece dries quickly and is often more affordable. A packable down or synthetic insulated jacket also earns its place in your bag for the chilliest spells, as many Iceland fall packing guides recommend.

This is the layer you will rely on more than heavy insulation. Because September temperatures rarely require extreme cold weather gear, a solid mid layer is usually sufficient, especially when paired with a windproof outer shell.

For additional flexibility, a vest that can slip under your shell when you need extra core warmth may help you adapt to an unexpectedly chilly evening.

Outer Shell: Waterproof and Windproof Jacket

A waterproof and windproof jacket is the single most important item you will bring to Reykjavik in September. It should be roomy enough to fit over your mid layers, but not so heavy that you overheat during active excursions.

Look for a jacket with sealed seams, a hood that can cinch down in heavy wind, and cuffs that keep rain from running up your sleeves. Many travelers choose a simple rain shell and wear a separate insulated layer underneath, because that gives you the option to wear the mid layer alone on dry days.

Pit zips are a useful feature for regulating temperature, while a longer cut offers extra protection for your hips. Test the jacket before you leave to confirm it fits comfortably over your thickest layers.

Bottoms: Pants and Rain Trousers

For everyday exploring, dark-colored quick-dry trousers or jeans can work, but keep in mind that jeans soak up water and dry slowly—a major drawback if a downpour catches you. Many travelers recommend packing at least one pair of waterproof over-trousers for days spent outside in persistent rain.

These over-trousers are lightweight and pack down small, so they are easy to stash in a day pack and pull on before a hike or a visit to a waterfall. If you prefer a more streamlined packing list, look for hiking pants made with a durable water-repellent finish instead.

Footwear: Boots for City and Trails

Sturdy, waterproof hiking boots or shoes are vital for keeping your feet dry on wet pavement and boggy trails alike. Choose a pair with solid grip, since harbor areas and rocky paths can be slippery, and break them in before your trip to avoid blisters.

If you plan to spend most of your time in the city, waterproof sneakers or leather boots may be enough, but they will not provide the ankle support or traction you want for a day of hiking. Many travelers pack one pair of waterproof hiking shoes and a second pair of more polished waterproof boots, plus a pair of flip flops for the geothermal pools, though that can add weight to your bag.

Accessories: The Essentials for Wind and Rain

A warm hat, gloves, and a scarf or neck gaiter will make your trip noticeably more comfortable, especially when the wind picks up. Wool or fleece options are best, and it helps to have a spare hat if yours gets soaked in a downpour.

Don’t forget a compact umbrella for walking around town—it can be handy in light drizzle—but be aware that strong gusts may make it useless or even risky. Polarized sunglasses are worth packing too, because low-angled autumn sun combined with wet roads creates pronounced glare, particularly if you are driving.

What to Leave Behind

Heavy winter parka and ski gear are overkill for September, unless you plan to spend long hours on glaciers or highlands. Similarly, elegant footwear is best kept to a single pair of waterproof booties for dinners; you will not want to deal with soaked suede or leather.

While cotton jeans are popular for travel, they are impractical for Iceland’s wet autumn. Leave your favorite denim at home if you cannot fit waterproof over-trousers, and bring quick-drying synthetic pants instead.

Sample Packing List for a Week in September

A practical seven-day list starts with two or three merino baselayers, one or two fleece or wool midlayers, a single waterproof shell, and two pairs of quick-drying pants. Toss in waterproof over-trousers, a packable insulated jacket for cooler evenings, and a spare set of thermal leggings.

Footwear can stay lean with one pair of waterproof hiking boots or shoes and one pair of comfortable waterproof sneakers or leather boots for city days, plus flip-flops if you plan to visit the Blue Lagoon or a local pool. Wrap up with several pairs of wool socks, a warm hat, gloves, and a scarf, and you are covered.

When you lay out all your clothes, they should feel like a modest capsule rather than an expedition. The goal is to have items that mix and match easily for repeated wear, so you can stay warm and dry without hauling an oversized suitcase.

Before You Go: Check the Forecast

Reykjavik’s weather can shift dramatically within hours, so review the official Icelandic Meteorological Office forecasts in the days leading up to your departure. Pay special attention to the wind speed and precipitation, not just the temperature, because those factors dictate which layers you will actually need.

If you are traveling for more than a week, keep an eye on the forecast as your trip progresses and adjust your plans—have a backup indoor activity in mind for the rainiest afternoon and a warm café or museum to step into between showers.

Plan Your Style for September

Packing for Reykjavik in September comes down to embracing layers and prioritizing waterproofing. Start with a moisture-wicking base, add a warm wool or fleece midlayer, and finish with a reliable rain shell and sturdy boots.

With that foundation, you can navigate the city and the countryside without letting the wind or rain slow you down. For a full overview of everything you need, browse our main Reykjavik guide, and if you are planning returns in colder months, check our advice for what to wear in Reykjavik in January.