Port Isabel Weather in September

Port Isabel in September sees very high daytime temperatures of 32°C (90°F) and nighttime lows of 25°C (77°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.

Rainfall in Port Isabel in September

With the year's heaviest rain occurring this month, it's best to be equipped with a poncho to handle the frequent downpours. Expect around 14 days of rain based on historical data, with 171 mm (6.7 in) average. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Port Isabel in September

September in Port Isabel brings typical temperatures with highs around 32°C (90°F) and lows of 25°C (77°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights are warm at 25°C (77°F). It's worth making sure your accommodation has decent ventilation or air conditioning.

Sunshine in Port Isabel in September

Enjoy a sunny month with about 246 hours of sunshine, the clear skies make Port Isabel even more beautiful.

If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Port Isabel. Our weather planner can help you explore destinations with more pleasant weather conditions.

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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 Port Isabel's climate page.

Port Isabel Temperature in September

Min Temperature 25°C (77°F)  

Max Temperature 32°C (90°F)  

Chance of Rain 47%  

Precipitation 171 mm (6.7 in)  

Rainy days 14 days  

Humidity 76% *  

Sunshine 246 hours *  

Percentage Sunshine 67% *  

* Data from: Brownsville, the United States of America (29 KM, 18 Miles).

What to Wear in Port Isabel in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Port Isabel 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 Port Isabel's climate page.

More climate data for Port Isabel

Temperature Rainfall Sunshine Humidity

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