Monterrey Weather in September

Monterrey in September sees high temperatures, with highs around 29°C (84°F) and overnight lows of 21°C (70°F). With the rainy season in full effect, expect around 301 mm (12 in) of rainfall and regular showers throughout the month.

Rainfall in Monterrey in September

Monterrey is in the rainy season in September, with rain on around 23 days and an average of 301 mm (12 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.

Temperature in Monterrey in September

Daytime highs in Monterrey in September reach 29°C (84°F), with nights around 21°C (70°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights remain mild at 21°C (70°F), making evenings a pleasant time to be outdoors.

September in Monterrey 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.

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 Costa Rica, check out our Monterrey's climate page.

Monterrey Temperature in September

Min Temperature 21°C (70°F)  

Max Temperature 29°C (84°F)  

Chance of Rain 77%  

Precipitation 301 mm (12 in)  

Rainy days 23 days  

Humidity 88% *  

* Data from: Los Chiles, Costa Rica (53 KM, 33 Miles).

What to Wear in Monterrey 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.

What To Do in Monterrey in September

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

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 Costa Rica, check out our Monterrey's climate page.

More climate data for Monterrey

Temperature Rainfall Humidity

See the full Monterrey climate overview or explore weather in Costa Rica.