What Should You Wear for Rafting in Colorado in September? Essential Clothing & Gear Tips
September in Colorado is a strange in-between season on the river. Days can still feel like summer by early afternoon, but mornings carry a real chill, and river temperatures can be noticeably cooler after the peak summer runoff period.
If you are wondering what to wear while rafting in September, the short version is: layer smart, skip the cotton, and plan for temperature swings between the put-in and take-out.
This guide breaks down what to wear, when a wetsuit or splash layer may make sense, and what to bring before and after your trip, so you can prepare for Colorado’s changing September conditions without overpacking.
Why September Rafting Clothing Is Different
By September, many Colorado rivers have moved beyond their peak runoff period, but conditions can vary considerably by river and trip. Air temperatures at higher elevations can be chilly in the morning and warm considerably by midday.
The combination of cool mornings, cold river water, wind, and splash makes September different from a typical July outing. You’re not dressing for one temperature; you’re preparing for several conditions over the course of the same trip.
How Cold Is the Water When Rafting in September?
There isn’t one water temperature for every Colorado River. River temperature varies by elevation, water source, river section, and time of year. Some sections are warmer and calmer, while snowmelt-fed stretches can remain cold well into late summer.
That’s why the air temperature alone isn’t a reliable guide for deciding what to wear. A sunny September afternoon can feel warm before launch, but getting repeatedly splashed or sitting in wet clothing can make the same trip feel considerably colder.
You want enough insulation to stay comfortable without restricting movement in the raft. The goal is to use materials and layers that continue to work when they get wet.
The Base Layer: Start Here
Your base layer sits against your skin, so choose something that dries quickly and doesn’t hold water.
- Swimsuit or quick-dry shorts as your first layer
- Moisture-wicking synthetic top made from nylon or polyester
- Quick-dry leggings or similar athletic layers if you prefer more coverage
Avoid cotton. A cotton shirt, sweatshirt, or pair of jeans can absorb water, stay wet, and become uncomfortable as temperatures drop.
Mid-Layer: Where September Rafting Gear Matters
A lightweight mid-layer can make a noticeable difference on a cool morning or a trip with frequent splashes.
- Long-sleeve synthetic shirt for additional coverage
- Thin wool or synthetic layer if you tend to get cold
- Wool or synthetic leggings when conditions call for more insulation
Wool can be useful because it retains insulating properties when damp, while synthetic materials are designed to move moisture away from the skin and dry relatively quickly.
Avoid piling on bulky clothing. You want enough insulation to stay comfortable without restricting movement in the raft.
Do Rafting Companies Provide Wetsuits?
This depends on the outfitter and the trip, so it’s worth checking before you arrive. Some Colorado rafting companies provide wetsuits or other cold-weather gear when conditions require it. KODI Rafting provides complimentary cold-weather gear such as wetsuits, booties and splash tops on applicable trips. Gear needs and availability vary by river and trip, so check your trip-specific details before arriving.
For example, KODI’s Upper Colorado River half-day trip notes that wetsuits and splash tops aren’t necessary on that warmer, milder section.
The takeaway is simple: don’t assume that every September rafting trip requires a full wetsuit or that every trip will have the same clothing requirements.
Outer Layer: Splash and Wind Protection
A lightweight splash jacket can help block wind and spray without adding much bulk. It’s particularly useful when the morning starts cool or when you’re expecting frequent splashes.
You don’t necessarily need a heavy waterproof coat for the river. The better choice is a lightweight outer layer designed to handle moisture and wind while allowing you to move comfortably.
Footwear, Headwear and Sun Protection
Your footwear should stay securely attached to your feet if you end up in moving water or need to walk around wet river access areas.
- Closed-toe shoes or water sandals with a secure ankle strap are good choices.
- No flip-flops or Crocs, which are not appropriate for the trip.
- Sunglasses with a retention strap help protect your eyes while keeping them attached.
- A hat with a secure fit or strap can provide additional sun protection.
Cooler temperatures don’t eliminate sun exposure. Colorado’s elevation and open river environments can make sun protection important even when the air doesn’t feel particularly hot.
What to Pack for the Ride Home
Bring a complete change of dry clothes, including warm layers and dry shoes. This can be especially useful in September, when temperatures can fall quickly once the sun goes down.
Keep those clothes in your vehicle or another designated dry location rather than bringing unnecessary items onto the raft. A dry sweatshirt, pants, socks, and shoes can make the end of the day much more comfortable.
September vs. Summer Rafting: What Changes?
| Factor | Peak Summer | September |
| Air temperature | Generally warmer | Cool mornings, milder afternoons |
| Water conditions | Vary by river and runoff | Often lower than peak runoff, but varies by river |
| Layering | Usually lighter | More useful, especially mornings |
| Cold-weather gear | Trip-dependent | More likely to be useful |
| Overall feel | Warmer, busier | Cooler, often quieter and more fall-like |
The right September outfit isn’t about wearing as many layers as possible. It’s about choosing clothing that performs when it gets wet and being prepared for the difference between a cool morning and a warmer afternoon.
For most trips, think quick-drying base layer, optional insulation, secure footwear, sun protection, and a dry change of clothes. Then check the specific trip conditions and gear recommendations before you leave.
Ready to plan your Colorado rafting adventure? Explore KODI Rafting’s current trip options and review the trip-specific gear guidance before booking to make sure you know what to wear and what equipment is available for your selected trip.
Frequently Asked Questions
Is September too cold for rafting in Colorado?
Not necessarily. Conditions vary by river, weather, and time of day, so lightweight layers can help you adjust as temperatures change.
Can I wear a sweatshirt or jacket while rafting?
A bulky sweatshirt or regular jacket can become heavy when wet. Lightweight synthetic layers and splash jackets are generally more practical.
What should I wear if I get cold easily?
Add a lightweight long-sleeve synthetic or wool layer and consider a splash jacket for extra protection from wind and spray.
What should I check before a September rafting trip?
Check the weather forecast and your outfitter’s trip-specific clothing guidance before leaving. Conditions can vary significantly between river sections.
