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Hermosillo, Sonora Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Hermosillo, Sonora?
Hermosillo, Sonora gets 282 mm of precipitation a year over about 19 rainy days. June is the warmest month (average high 42°C) and January the coldest (average low 7°C).
Hermosillo climate at a glance
How much rain does Hermosillo get?
Hermosillo gets 282 mm of precipitation in an average year, spread over about 19 days with measurable rain. That is fewer rainy days than 92% of Mexico.
August is the wettest month, with 97 mm. May is the driest, with 1 mm. August has the most rainy days, about 4.
From October 2025 to September 2026 Hermosillo got 137 mm of rain, against a normal of 282 mm for those months. August 2026 had the most, with 60 mm.
Hermosillo weather by month
Hermosillo weather in January
In January, Hermosillo averages a high of 27°C and a low of 7°C. It gets 5 mm of precipitation over about 1 rainy days. Estimated sunshine is 71% of daylight hours, derived from ERA5 cloud cover. The January record high is 34°C (2018) and the record low is -2°C (2013).
Hermosillo weather in March
In March, Hermosillo averages a high of 32°C and a low of 13°C. It gets 9 mm of precipitation over about 1 rainy days. Estimated sunshine is 64% of daylight hours, derived from ERA5 cloud cover. The March record high is 41°C (2017) and the record low is 0°C (1993).
Hermosillo weather in April
In April, Hermosillo averages a high of 36°C and a low of 16°C. It gets 14 mm of precipitation over about 0 rainy days. Estimated sunshine is 79% of daylight hours, derived from ERA5 cloud cover. The April record high is 43°C (1989) and the record low is 5°C (1998).
Hermosillo weather in May
In May, Hermosillo averages a high of 39°C and a low of 18°C. It gets 1 mm of precipitation over about 0 rainy days. Estimated sunshine is 88% of daylight hours, derived from ERA5 cloud cover. The May record high is 46°C (1996) and the record low is 12°C (1984).
Hermosillo weather in June
In June, Hermosillo averages a high of 42°C and a low of 23°C. It gets 4 mm of precipitation over about 1 rainy days. Estimated sunshine is 79% of daylight hours, derived from ERA5 cloud cover. The June record high is 49°C (2014) and the record low is 14°C (1988).
Hermosillo weather in July
In July, Hermosillo averages a high of 42°C and a low of 26°C. It gets 53 mm of precipitation over about 4 rainy days. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. The July record high is 48°C (2011) and the record low is 18°C (1979).
Hermosillo weather in August
In August, Hermosillo averages a high of 41°C and a low of 26°C. It gets 97 mm of precipitation over about 4 rainy days. Estimated sunshine is 60% of daylight hours, derived from ERA5 cloud cover. The August record high is 48°C (2025) and the record low is 19°C (1979).
Hermosillo weather in September
In September, Hermosillo averages a high of 39°C and a low of 24°C. It gets 49 mm of precipitation over about 4 rainy days. Estimated sunshine is 79% of daylight hours, derived from ERA5 cloud cover. The September record high is 47°C (2024) and the record low is 14°C (2017).
Hermosillo weather in October
In October, Hermosillo averages a high of 38°C and a low of 21°C. It gets 10 mm of precipitation over about 1 rainy days. Estimated sunshine is 86% of daylight hours, derived from ERA5 cloud cover. The October record high is 45°C (2024) and the record low is 7°C (2009).
Hermosillo weather in November
In November, Hermosillo averages a high of 30°C and a low of 11°C. It gets 20 mm of precipitation over about 1 rainy days. Estimated sunshine is 76% of daylight hours, derived from ERA5 cloud cover. The November record high is 43°C (2020) and the record low is 0°C (1993).
Sunshine, humidity and wind in Hermosillo
May is the sunniest month in Hermosillo, with estimated sunshine of 88% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 53%. The annual cloud-cover estimate is 73% of daylight hours; it is not a measurement of sunshine duration. Hermosillo is sunnier than 97% of Mexico.
Humidity peaks in August at 52% and is lowest in April at 26%.
Hermosillo has about 73 days a year above 32°C. Hermosillo is cooler than 59% of Mexico.
Hermosillo weather records
These records cover GENERAL IGNACIO P GARCIA INTL during 1973–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Hermosillo station is 49°C, on June 4, 2014. The coldest is -2°C, on January 15, 2013.
The wettest day in the available station history brought 463 mm of precipitation, on September 9, 2022.
26 all-time records have been set at the station since 1973.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 7° | 27° | 4.6 mm | 1 | 45% | 71% | 34° | -2° |
| February | — | 28° | 9.7 mm | 1 | 37% | 65% | 37° | -1° |
| March | 13° | 32° | 8.6 mm | 1 | 34% | 64% | 41° | 0° |
| April | 16° | 36° | 14 mm | 0 | 26% | 79% | 43° | 5° |
| May | 18° | 39° | 1.0 mm | 0 | 26% | 88% | 46° | 12° |
| June | 23° | 42° | 4.1 mm | 1 | 31% | 79% | 49° | 14° |
| July | 26° | 42° | 53 mm | 4 | 48% | 53% | 48° | 18° |
| August | 26° | 41° | 97 mm | 4 | 52% | 60% | 48° | 19° |
| September | 24° | 39° | 49 mm | 4 | 49% | 79% | 47° | 14° |
| October | 21° | 38° | 10 mm | 1 | 40% | 86% | 45° | 7° |
| November | 11° | 30° | 20 mm | 1 | 35% | 76% | 43° | 0° |
| December | 11° | — | 13 mm | 1 | 37% | 72% | 34° | 0° |
Station: GENERAL IGNACIO P GARCIA INTL, 8 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1973–2025; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Hermosillo climate questions
How much rain does Hermosillo get?
Hermosillo gets 282 mm of precipitation in an average year, over about 19 rainy days.
What is the wettest month in Hermosillo?
August is the wettest month in Hermosillo, with 97 mm. May is the driest, with 1 mm.
How many rainy days does Hermosillo have a year?
Hermosillo has about 19 days with measurable rain in an average year. August has the most, about 4.
What is the hottest month in Hermosillo?
June is the warmest month in Hermosillo, with an average high of 42°C.
What is the coldest month in Hermosillo?
January is the coldest month in Hermosillo, with an average low of 7°C.
What is the record high temperature in Hermosillo?
Within the available 1973–2025 station history, the record high at the Hermosillo station is 49°C, set on June 4, 2014. The record low is -2°C, on January 15, 2013.
What is the sunniest month in Hermosillo?
May is the sunniest month in Hermosillo, with estimated sunshine of 88% of daylight hours from ERA5 cloud cover. July is the cloudiest.