Marathon Weather in September

Marathon in September sees very high daytime temperatures of 32°C (90°F) and nighttime lows of 26°C (79°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.

Rainfall in Marathon in September

This month is characterized by heavy rain, often falling intensely. Equip yourself with a poncho to stay protected from the rain. Typically, about 23 days will experience rainfall, with an average of 183 mm (7.2 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.

Temperature in Marathon in September

September in Marathon sees highs of 32°C (90°F) and lows of 26°C (79°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. At 26°C (79°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.

Sunshine in Marathon in September

Expect a lot of sunshine this month, with about 271 hours of sun. These sunny conditions add to the overall experience.

September in Marathon has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.

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• January
• February
• March
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• May
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• October
• November
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For a detailed overview over the year and the best time to visit the United States of America, check out our Marathon's climate page.

Marathon Temperature in September

Min Temperature 26°C (79°F)  

Max Temperature 32°C (90°F)  

Chance of Rain 75%  

Precipitation 183 mm (7.2 in)  

Rainy days 23 days  

Humidity 75% *  

Sunshine 271 hours *  

Percentage Sunshine 73% *  

* Data from: Key West, the United States of America (73 KM, 45 Miles).

What to Wear in Marathon in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Marathon in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

8/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Marathon's climate page.

More climate data for Marathon

Temperature Rainfall Sunshine Humidity

See the full Marathon climate overview or explore weather in the United States of America.