Monterrey, Mexico Climate & Monthly Averages
Monterrey has a humid subtropical climate. August is the hottest month, averaging 94° by day; January is the coldest at 67°.
Sunshine is a defining feature of Monterrey's climate
Expect hot, humid summers and generally mild winters in Monterrey: that is what a humid subtropical climate means in practice. Highs peak at 94°F (34°C) in August and fall to 67°F (19°C) by January, with 10.1 hours of sun on an average day.
How sun, temperature and rain fit together
July is the brightest month at 12.1 hours of sun a day, against an annual average of 10.1. At its warmest, in August, Monterrey runs to 94°F (34°C) in the afternoon and back to 74°F (23°C) by dawn. January sits at the other end of the year: 67°F (19°C) by day, 48°F (9°C) at night. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 112°F (44°C) and the lowest daily minimum 19°F (-7°C).
Days and nights are about 10°C apart on average - wider than roughly 78% of the cities we track.
Precipitation concentrates in September - 4.5 inches (114 mm) on 11 days - and thins out by February.
More climate facts for Monterrey
- Hottest month: August - highs near 94°F (34°C)
- Coldest month: January - highs near 67°F (19°C)
- Decade extremes (2015-2024): 112°F (44°C) high · 19°F (-7°C) low
- Wettest month: September (11 rainy days) · Sunniest: July (12.1 h sun/day)
- Climate type: humid subtropical
- Annual swing: 14°C between the average warmest and coolest month · day to night: 10°C
- Months averaging 30°C or hotter: 5
- Average humidity: 66%
The most comfortable sunny-weather window
Best time to visit Monterrey
October to March is the sweet spot for Monterrey - warm days, manageable rainfall and plenty of daylight line up. Expect 74°F (23°C) in the afternoon and around 6 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in October.
What to pack
Pack for Monterrey with lightweight, breathable clothing and serious sun protection and rain gear if you travel around September. August nights average 74°F (23°C), so evenings rarely match the afternoons.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 67° | 48° | 6 | 1.1 in | 8.2 h/day | 10.7 h | 18% | 65% |
| February | 73° | 52° | 4 | 0.8 in | 9.2 h/day | 11.3 h | 13% | 62% |
| March | 79° | 58° | 7 | 2.2 in | 9.5 h/day | 11.9 h | 22% | 63% |
| April | 84° | 63° | 9 | 2.0 in | 10.1 h/day | 12.7 h | 29% | 65% |
| May | 88° | 69° | 11 | 2.5 in | 10.9 h/day | 13.4 h | 36% | 71% |
| June | 91° | 71° | 8 | 2.6 in | 12.0 h/day | 13.7 h | 27% | 67% |
| July | 93° | 73° | 6 | 1.9 in | 12.1 h/day | 13.6 h | 18% | 62% |
| August | 94° | 74° | 5 | 1.0 in | 12.0 h/day | 13.0 h | 17% | 59% |
| September | 87° | 71° | 11 | 4.5 in | 10.4 h/day | 12.3 h | 36% | 70% |
| October | 80° | 64° | 8 | 2.9 in | 9.4 h/day | 11.5 h | 25% | 71% |
| November | 73° | 57° | 7 | 1.5 in | 8.5 h/day | 10.9 h | 25% | 73% |
| December | 70° | 52° | 5 | 1.1 in | 8.4 h/day | 10.5 h | 17% | 67% |
Monterrey month by month
Each card shows the average high and low. The bar places that month between Monterrey's coldest night and warmest afternoon.
January
- Rain
- 6 days
- Sunshine
- 8.2 h
- Daylight
- 10.7 h
February
- Rain
- 4 days
- Sunshine
- 9.2 h
- Daylight
- 11.3 h
March
- Rain
- 7 days
- Sunshine
- 9.5 h
- Daylight
- 11.9 h
April
- Rain
- 9 days
- Sunshine
- 10.1 h
- Daylight
- 12.7 h
May
- Rain
- 11 days
- Sunshine
- 10.9 h
- Daylight
- 13.4 h
June
- Rain
- 8 days
- Sunshine
- 12.0 h
- Daylight
- 13.7 h
July
- Rain
- 6 days
- Sunshine
- 12.1 h
- Daylight
- 13.6 h
August
- Rain
- 5 days
- Sunshine
- 12.0 h
- Daylight
- 13.0 h
September
- Rain
- 11 days
- Sunshine
- 10.4 h
- Daylight
- 12.3 h
October
- Rain
- 8 days
- Sunshine
- 9.4 h
- Daylight
- 11.5 h
November
- Rain
- 7 days
- Sunshine
- 8.5 h
- Daylight
- 10.9 h
December
- Rain
- 5 days
- Sunshine
- 8.4 h
- Daylight
- 10.5 h
Looking for warmer alternatives? Browse warm places by month, or compare Monterrey's coolest part of the year: January, December, November.
Seasonal weather under Monterrey's sunnier skies
Spring (March through May)
Through spring, Monterrey runs hot: 84°F (29°C) by day, 63°F (17°C) after dark, and expect showers on roughly 27 days across the season. Daylight is generous - around 10.2 hours of sun a day.
Summer (June through August)
Summer in Monterrey runs at full heat, with daytime highs averaging 92°F (34°C) and nights around 73°F (23°C); expect showers on roughly 19 days across the season. Daylight is generous - around 12.0 hours of sun a day.
Fall (September through November)
Through fall, Monterrey settles into easy warmth: 80°F (27°C) by day, 64°F (18°C) after dark, and expect showers on roughly 26 days across the season.
Winter (December through February)
Through winter, Monterrey is pleasantly warm: 70°F (21°C) by day, 51°F (10°C) after dark, and rain comes on about 14 days over the three months.
How unusual is Monterrey?
- Monterrey sits close to the middle of our dataset on most measures: 71°F (22°C) as an annual average, 24.0 inches (610 mm) of precipitation and 10.1 hours of sun a day.
These comparisons use the same ten-year window for every city in the dataset.
Monterrey temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.