Running in 45°F Weather

What to Wear Running in 45°F

45°F (about 7°C) sits right in the “slightly cool” band where your body heats up fast once you get moving. The golden rule: dress for 15–20°F warmer than the thermometer reads, because a running body feels roughly that much warmer than a standing one. Here's how that breaks down by body zone.

Upper Body

• Long sleeve technical shirt: A lightweight, moisture-wicking long sleeve is the go-to. Avoid cotton — it holds sweat and gets clammy.
• Short sleeve + arm sleeves: A great alternative. Arm sleeves let you dump heat by pushing them down once you warm up.
• Optional light vest: If you run cold or it's windy, a thin vest keeps your core warm without overheating your arms.

Lower Body

• Running shorts: For most runners, standard shorts are perfect at 45°F — your legs generate plenty of heat.
• Capris or 3/4 tights: A comfortable pick if you specifically dislike cold knees or are running easy.

Accessories

• Light gloves (optional): Hands and ears lose heat fastest. Thin gloves for the first 5–10 minutes make a big difference, then tuck them in your waistband.
• Headband or ear warmer: Only if it's windy or you're sensitive to cold ears.

Adjust for the Conditions

Air temperature is only half the story. Fine-tune based on what else is happening outside:

• Windy (15+ mph): Add a wind vest or light windbreaker — wind at 45°F can feel like the low 30s. See our 35°F guide for colder-feeling days.
• Rain: Swap the shirt for a water-resistant layer and add a cap with a brim. Our running in the rain guide covers wet-weather gear in depth.
• Bright sun / clear sky: It'll feel warmer than 45°F — lean toward short sleeve with arm sleeves.
• Early morning / dusk: Dawn runs feel colder than the daytime high. Start with gloves you can shed.

What NOT to Wear

The most common mistake at 45°F is overdressing. If you're toasty at the start line, you'll be overheated and sweat-soaked by mile two.

• Skip the heavy jacket — a long sleeve is almost always enough.
• Skip full-length tights unless you're running very easy or truly hate cool legs.
• Skip cotton anything — it traps sweat and chills you on the way home.

45°F vs. Nearby Temperatures

The jump between temperature bands is smaller than you'd think. At 40°F you'll want gloves and maybe a headband more often; by 50°F most runners drop the gloves entirely and go with a short sleeve. 45°F is the hinge point — comfortable in a long sleeve and shorts almost regardless of your cold tolerance.

Why 45°F Is Ideal for Running

45°F is widely considered one of the best temperatures for distance running. You won't overheat on long efforts, your heart rate stays lower for a given pace, and you sweat less — so you lose less fluid. It's no accident that many marathon PRs and race records are set in 40–50°F conditions. If you get to choose when to run hard, this is the range to pick.

Pro Tips

• You should feel slightly cool in the first few minutes — that's the sign you've dressed right.
• Peel off gloves and tuck them in your waistband after you warm up.
• 45°F is ideal for tempo runs, intervals, and races — take advantage of it.
• Chafing risk is low with light gear, but still apply anti-chafe balm on long runs.

Frequently Asked Questions

What should I wear running in 45 degree weather?

A long sleeve technical shirt (or short sleeve with arm sleeves) plus running shorts. Add light gloves for the first mile if your hands run cold. This is near-ideal running temperature, so keep layers minimal.

Is 45 degrees good for running?

Yes — 45°F is excellent. It's in the sweet spot (roughly 40–55°F) where you won't overheat but also won't need heavy layers, which makes it great for workouts and races.

Do I need pants for running in 45 degrees?

Most runners wear shorts at 45°F — your legs produce plenty of heat and rarely need coverage above 40°F. Wear tights or capris only if you strongly prefer them or are running very easy.

Should I wear gloves running in 45 degrees?

Optional. Hands lose heat quickly, so thin gloves for the first 5–10 minutes are nice if you run cold — but you'll likely want to take them off once you're warm.