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Heroica Guaymas, 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 Heroica Guaymas, Sonora?
Heroica Guaymas, Sonora gets 174 mm of precipitation a year over about 13 rainy days. July is the warmest month (average high 37°C) and January the coldest (average low 8°C).
Desert climate
Heroica Guaymas, Sonora has hot summers and warm winters. Daytime highs range from about 26°C in January to 37°C in August. August is usually the wettest month. The most comfortable time to visit is typically January and December, when daytime highs sit near 26°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 9° | 26° |
| Spring | Mar–May | 14° | 32° |
| Summer | Jun–Aug | 24° | 37° |
| Autumn | Sep–Nov | 19° | 34° |
How much rain does Heroica Guaymas get?
Heroica Guaymas gets 174 mm of precipitation in an average year, spread over about 13 days with measurable rain. That is fewer rainy days than 95% of Mexico.
August is the wettest month, with 52 mm. May is the driest, with 1 mm. August has the most rainy days, about 3.
The longest dry spell in the last five years lasted 113 days, to December 12, 2023.
From October 2025 to September 2026 Heroica Guaymas got 59 mm of rain, against a normal of 174 mm for those months. September 2026 had the most, with 41 mm.
Heroica Guaymas weather by month
Heroica Guaymas weather in January
In January, Heroica Guaymas averages a high of 26°C and a low of 8°C. It gets 5 mm of precipitation over about 1 rainy days. Estimated sunshine is 70% of daylight hours, derived from ERA5 cloud cover. The January record high is 36°C (2018) and the record low is 0°C (1996). January is one of the most comfortable months to visit.
Heroica Guaymas weather in February
In February, Heroica Guaymas averages a high of 27°C and a low of 10°C. It gets 9 mm of precipitation over about 1 rainy days. Estimated sunshine is 63% of daylight hours, derived from ERA5 cloud cover. The February record high is 39°C (2025) and the record low is 0°C (1994).
Heroica Guaymas weather in March
In March, Heroica Guaymas averages a high of 29°C and a low of 12°C. It gets 8 mm of precipitation over about 0 rainy days. Estimated sunshine is 64% of daylight hours, derived from ERA5 cloud cover. The March record high is 39°C (1989) and the record low is 0°C (1993).
Heroica Guaymas weather in April
In April, Heroica Guaymas averages a high of 32°C and a low of 14°C. It gets 1 mm of precipitation over about 0 rainy days. Estimated sunshine is 74% of daylight hours, derived from ERA5 cloud cover. The April record high is 42°C (2006) and the record low is 7°C (2017).
Heroica Guaymas weather in May
In May, Heroica Guaymas averages a high of 34°C and a low of 17°C. It gets 1 mm of precipitation over about 0 rainy days. Estimated sunshine is 85% of daylight hours, derived from ERA5 cloud cover. The May record high is 44°C (2018) and the record low is 9°C (2016).
Heroica Guaymas weather in June
In June, Heroica Guaymas averages a high of 36°C and a low of 22°C. It gets 3 mm of precipitation over about 0 rainy days. Estimated sunshine is 80% of daylight hours, derived from ERA5 cloud cover. The June record high is 48°C (2024) and the record low is 14°C (1990).
Heroica Guaymas weather in July
In July, Heroica Guaymas averages a high of 37°C and a low of 26°C. It gets 31 mm of precipitation over about 2 rainy days. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. The July record high is 44°C (1979) and the record low is 18°C (1983).
Heroica Guaymas weather in August
In August, Heroica Guaymas averages a high of 37°C and a low of 26°C. It gets 52 mm of precipitation over about 3 rainy days. Estimated sunshine is 64% of daylight hours, derived from ERA5 cloud cover. The August record high is 43°C (2021) and the record low is 19°C (1994).
Heroica Guaymas weather in September
In September, Heroica Guaymas averages a high of 36°C and a low of 24°C. It gets 26 mm of precipitation over about 2 rainy days. Estimated sunshine is 80% of daylight hours, derived from ERA5 cloud cover. The September record high is 46°C (2020) and the record low is 13°C (2017).
Heroica Guaymas weather in October
In October, Heroica Guaymas averages a high of 34°C and a low of 19°C. It gets 12 mm of precipitation over about 1 rainy days. Estimated sunshine is 87% of daylight hours, derived from ERA5 cloud cover. The October record high is 43°C (1996) and the record low is 9°C (2020).
Heroica Guaymas weather in November
In November, Heroica Guaymas averages a high of 30°C and a low of 13°C. It gets 12 mm of precipitation over about 1 rainy days. Estimated sunshine is 75% of daylight hours, derived from ERA5 cloud cover. The November record high is 39°C (2008) and the record low is 4°C (1983).
Heroica Guaymas weather in December
In December, Heroica Guaymas averages a high of 26°C and a low of 9°C. It gets 14 mm of precipitation over about 1 rainy days. Estimated sunshine is 72% of daylight hours, derived from ERA5 cloud cover. The December record high is 35°C (2015) and the record low is 0°C (1997). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in Heroica Guaymas
October is the sunniest month in Heroica Guaymas, with estimated sunshine of 87% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 56%. The annual cloud-cover estimate is 73% of daylight hours; it is not a measurement of sunshine duration. Heroica Guaymas is sunnier than 97% of Mexico.
Humidity peaks in August at 64% and is lowest in April at 49%.
Heroica Guaymas has about 109 days a year above 32°C. Heroica Guaymas is hotter than 54% of Mexico.
Heroica Guaymas weather records
These records cover EMPALME SON. during 1977–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Heroica Guaymas station is 48°C, on June 13, 2024. The coldest is 0°C, on March 1, 1993.
The wettest day in the available station history brought 202 mm of precipitation, on July 30, 2000.
25 all-time records have been set at the station since 1977.
The best time to visit Heroica Guaymas
The most comfortable time to visit is typically January and December, when daytime highs sit near 26°C.
Winter (December–February) is warm, with average highs around 26°C and lows near 9°C.
Spring (March–May) is hot, with average highs around 31°C and lows near 14°C.
Summer (June–August) is hot, with average highs around 37°C and lows near 25°C.
Autumn (September–November) is hot, with average highs around 34°C and lows near 19°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 8° | 26° | 5.3 mm | 1 | 62% | 70% | 36° | 0° |
| February | 10° | 27° | 9.4 mm | 1 | 56% | 63% | 39° | 0° |
| March | 12° | 29° | 7.6 mm | 0 | 52% | 64% | 39° | 0° |
| April | 14° | 32° | 0.8 mm | 0 | 49% | 74% | 42° | 7° |
| May | 17° | 34° | 0.5 mm | 0 | 50% | 85% | 44° | 9° |
| June | 22° | 36° | 3.0 mm | 0 | 54% | 80% | 48° | 14° |
| July | 26° | 37° | 31 mm | 2 | 62% | 56% | 44° | 18° |
| August | 26° | 37° | 52 mm | 3 | 64% | 64% | 43° | 19° |
| September | 24° | 36° | 26 mm | 2 | 64% | 80% | 46° | 13° |
| October | 19° | 34° | 12 mm | 1 | 58% | 87% | 43° | 9° |
| November | 13° | 30° | 12 mm | 1 | 56% | 75% | 39° | 4° |
| December | 9° | 26° | 14 mm | 1 | 59% | 72% | 35° | 0° |
Station: EMPALME SON., 13 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1977–2025; 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.
Heroica Guaymas climate questions
How much rain does Heroica Guaymas get?
Heroica Guaymas gets 174 mm of precipitation in an average year, over about 13 rainy days.
What is the wettest month in Heroica Guaymas?
August is the wettest month in Heroica Guaymas, with 52 mm. May is the driest, with 1 mm.
How many rainy days does Heroica Guaymas have a year?
Heroica Guaymas has about 13 days with measurable rain in an average year. August has the most, about 3.
What is the hottest month in Heroica Guaymas?
July is the warmest month in Heroica Guaymas, with an average high of 37°C.
What is the coldest month in Heroica Guaymas?
January is the coldest month in Heroica Guaymas, with an average low of 8°C.
What is the record high temperature in Heroica Guaymas?
Within the available 1977–2025 station history, the record high at the Heroica Guaymas station is 48°C, set on June 13, 2024. The record low is 0°C, on March 1, 1993.
What is the sunniest month in Heroica Guaymas?
October is the sunniest month in Heroica Guaymas, with estimated sunshine of 87% of daylight hours from ERA5 cloud cover. July is the cloudiest.
What is the best time to visit Heroica Guaymas?
The most comfortable time to visit is typically January and December, when daytime highs sit near 26°C.