Monterrey Weather in September
With daytime temperatures of 30°C (86°F) and nighttime lows of 19°C (66°F), September in Monterrey brings high temperatures during the day. It is also the wettest month of the year, so pack an umbrella.
Rainfall in Monterrey in September
Prepare for the wettest month with an umbrella to protect yourself from frequent rain. Historically, approximately 7 days this month are expected to have rain, averaging 150 mm (5.9 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Monterrey in September
Temperatures in Monterrey in September top out at 30°C (86°F) and drop to 19°C (66°F) overnight. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 19°C (66°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Monterrey in September
The days are predominantly sunny, with an estimated total of around 200 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Mexico, check out our Monterrey's climate page.
Monterrey Temperature in September
Min Temperature
19°C (66°F)
Max Temperature
30°C (86°F)
Chance of Rain
25%
Precipitation
150 mm (5.9 in)
Rainy days
7 days
Humidity
70%
Sunshine
200 hours
Percentage Sunshine
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Monterrey typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are pleasant, with lows typically ranging from 18°C (64°F) to 22°C (72°F).
Average temperatures in September
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Monterrey in September
Browse day-by-day weather records for Monterrey spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Monterrey historical weather extremes in September
Our historical data for Monterrey spans 1986 to 2025, revealing these weather extremes.
- On September 6, 2000, temperatures climbed to 41°C (106°F), marking the warmest September day on record.
- The coldest September day was on September 20, 1991, with a maximum of 18°C (64°F).
- The lowest overnight temperature recorded in September was 10°C (50°F) (September 30, 2010).
Best Places in Mexico in September
Find out more about the weather in Mexico and which places have the best travel conditions in this month. See all of Mexico in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Monterrey in September
Warm but pleasant conditions in Monterrey in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Monterrey in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Mexico, check out our Monterrey's climate page.
Temperature Rainfall Sunshine Humidity
See the full Monterrey climate overview or explore weather in Mexico.
