Harlingen Weather in September

September in Harlingen brings very high temperatures around 33°C (91°F) during the day, dropping to 23°C (73°F) at night, with the most rainfall of the year.

Rainfall in Harlingen in September

It's the month with the heaviest rainfall, so an umbrella is a must to navigate the wet weather. Rain is expected on roughly 13 days, totalling around 140 mm (5.5 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Harlingen in September

September in Harlingen sees highs of 33°C (91°F) and lows of 23°C (73°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. With overnight lows of 23°C (73°F), evenings stay pleasantly warm.

Sunshine in Harlingen in September

The days are predominantly sunny, with an estimated total of around 246 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

September in Harlingen can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.

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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 Harlingen's climate page.

Harlingen Temperature in September

Min Temperature 23°C (73°F)  

Max Temperature 33°C (91°F)  

Chance of Rain 43%  

Precipitation 140 mm (5.5 in)  

Rainy days 13 days  

Humidity 76% *  

Sunshine 246 hours *  

Percentage Sunshine 67% *  

* Data from: Brownsville, the United States of America (41 KM, 25 Miles).

What to Wear in Harlingen in September

Get ready for hot weather in September! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Harlingen in September

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

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

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 Harlingen's climate page.

More climate data for Harlingen

Temperature Rainfall Sunshine Humidity

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