Heroica Guaymas climate
Heroica Guaymas (Sonora, Mexico) has a hot desert climate (Köppen BWh). The average temperature over the year is 25 °C77 °F, and about 341 mm13 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Heroica Guaymas climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2476 | 1152 | 1864 | 120.5 |
| Feb | 2678 | 1253 | 1966 | 110.4 |
| Mar | 2883 | 1457 | 2170 | 70.3 |
| Apr | 3188 | 1661 | 2475 | 20.1 |
| May | 3493 | 2068 | 2781 | 10.0 |
| Jun | 38100 | 2576 | 3188 | 110.4 |
| Jul | 3697 | 2780 | 3289 | 843.3 |
| Aug | 3696 | 2780 | 3188 | 843.3 |
| Sep | 3596 | 2577 | 3087 | 903.5 |
| Oct | 3392 | 2069 | 2780 | 220.9 |
| Nov | 2983 | 1660 | 2272 | 110.4 |
| Dec | 2475 | 1152 | 1864 | 80.3 |
| Year | 38100 | 1152 | 2577 | 34113 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 48% | 39% | 4.2 | 10:33 |
| Feb | 47% | 41% | 5.1 | 11:10 |
| Mar | 42% | 36% | 6.4 | 11:56 |
| Apr | 40% | 36% | 7.3 | 12:48 |
| May | 39% | 25% | 8.1 | 13:31 |
| Jun | 46% | 23% | 8.0 | 13:54 |
| Jul | 61% | 54% | 7.0 | 13:45 |
| Aug | 67% | 49% | 6.7 | 13:08 |
| Sep | 65% | 33% | 6.0 | 12:17 |
| Oct | 56% | 27% | 5.4 | 11:27 |
| Nov | 51% | 37% | 4.4 | 10:43 |
| Dec | 52% | 40% | 3.9 | 10:23 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Heroica Guaymas is like
The warmest month is July, with an average high of 36 °C97 °F and a low of 27 °C80 °F. The coldest is December, when highs average 24 °C75 °F and lows 11 °C52 °F. There is a clear seasonal cycle, with 13.8 °C24.8 °F between the average temperature of the warmest and the coolest month.
It is dry, with about 341 mm13 in of precipitation per year. The wettest three-month stretch is July–September, which brings 75% of the annual total. Months with less than 20 mm0.8 in on average: November–June. The wettest month is September (90 mm3.5 in), the driest is May (1 mm0.0 in).
Relative humidity ranges from 39% in May to 67% in August. The clearest skies (lowest average cloud amount, 23%) are typical of June. Average wind speed near the ground ranges from 7 km/h (4 mph) in August to 10 km/h (6 mph) in June. Daylight lasts from about 10.4 hours in December to 13.9 hours in June.
Best time to visit Heroica Guaymas
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–March: average highs of 24 °C75 °F to 29 °C83 °F with 7 mm0.3 in to 12 mm0.5 in of precipitation per month.
The most challenging month is June, which is hot, with average highs of 38 °C100 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Heroica Guaymas
- Winter (December–February) — highs 2475 to 26 °C78 °F, lows 1152 to 12 °C53 °F, about 10 mm0.4 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Spring (March–May) — highs 2883 to 34 °C93 °F, lows 1457 to 20 °C68 °F, about 3 mm0.1 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 3696 to 38 °C100 °F, lows 2576 to 27 °C80 °F, about 60 mm2.3 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Autumn (September–November) — highs 2983 to 35 °C96 °F, lows 1660 to 25 °C77 °F, about 41 mm1.6 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Heroica Guaymas compares
Compared with Ciudad Obregón, about 106 km to the southeast, Heroica Guaymas is on average 0.5 °C0.8 °F cooler and receives 13% less precipitation (341 mm13 in vs 394 mm16 in). The difference is largest in April (0.9 °C1.5 °F cooler).
Of the 96 places in Mexico covered by World Climates, Heroica Guaymas is the 30th warmest by annual mean temperature and the 85th wettest by annual precipitation. See all of them on the Mexico climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Thiès (Senegal, BSh), Roebourne (Australia, BWh) and Hub (Pakistan, BWh).
Nearby places
- Ciudad Obregón 106 km · 25 °C78 °F · 394 mm16 in
- Hermosillo 130 km · 24 °C75 °F · 382 mm15 in
- Navojoa 172 km · 25 °C78 °F · 502 mm20 in
- Los Mochis 303 km · 26 °C78 °F · 536 mm21 in
- Nogales 377 km · 18 °C65 °F · 359 mm14 in
- Cuauhtémoc 399 km · 14 °C58 °F · 483 mm19 in
- La Paz 424 km · 25 °C76 °F · 241 mm9.5 in
- Chihuahua 478 km · 19 °C66 °F · 371 mm15 in
Frequently asked questions
What is the warmest month in Heroica Guaymas?
July is the warmest month in Heroica Guaymas, with an average high of 36 °C (97 °F) and an average low of 27 °C (80 °F).
What is the coldest month in Heroica Guaymas?
December is the coldest month, with an average high of 24 °C (75 °F) and an average low of 11 °C (52 °F).
When does it rain the most in Heroica Guaymas?
September is the wettest month with about 90 mm (3.5 in) of precipitation; May is the driest with about 1 mm (0.0 in).
What is the best time to visit Heroica Guaymas?
Judging by long-term averages, the most comfortable months are November–March.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 103 m, while Heroica Guaymas lies at about 18 m. Temperatures on this page were therefore adjusted by +0.6 °C1 °F using the standard lapse rate of 6.5 °C per 1,000 m.