Hermosillo climate
Hermosillo (Sonora, Mexico) has a hot semi-arid climate (Köppen BSh). The average temperature over the year is 24 °C75 °F, and about 382 mm15 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Hermosillo climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2374 | 847 | 1660 | 160.6 |
| Feb | 2577 | 948 | 1762 | 130.5 |
| Mar | 2883 | 1153 | 2068 | 90.3 |
| Apr | 3289 | 1457 | 2373 | 20.1 |
| May | 3595 | 1864 | 2679 | 10.0 |
| Jun | 39103 | 2373 | 3188 | 120.5 |
| Jul | 3799 | 2678 | 3188 | 1104.3 |
| Aug | 3697 | 2577 | 3187 | 983.9 |
| Sep | 3696 | 2374 | 2985 | 793.1 |
| Oct | 3391 | 1864 | 2577 | 140.5 |
| Nov | 2781 | 1355 | 2068 | 150.6 |
| Dec | 2373 | 847 | 1660 | 120.5 |
| Year | 39103 | 847 | 2475 | 38215 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 43% | 32% | 4.0 | 10:28 |
| Feb | 41% | 36% | 4.9 | 11:08 |
| Mar | 35% | 30% | 6.3 | 11:55 |
| Apr | 31% | 26% | 7.5 | 12:50 |
| May | 29% | 17% | 8.3 | 13:35 |
| Jun | 33% | 24% | 8.1 | 13:59 |
| Jul | 53% | 59% | 6.9 | 13:50 |
| Aug | 60% | 51% | 6.7 | 13:11 |
| Sep | 58% | 33% | 6.0 | 12:18 |
| Oct | 47% | 20% | 5.3 | 11:25 |
| Nov | 42% | 28% | 4.2 | 10:39 |
| Dec | 45% | 32% | 3.7 | 10:17 |
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 Hermosillo is like
The warmest month is July, with an average high of 37 °C99 °F and a low of 26 °C78 °F. The coldest is December, when highs average 23 °C73 °F and lows 8 °C47 °F. There is a clear seasonal cycle, with 15.8 °C28.5 °F between the average temperature of the warmest and the coolest month.
It is dry, with about 382 mm15 in of precipitation per year. The wettest three-month stretch is July–September, which brings 76% of the annual total. Months with less than 20 mm0.8 in on average: October–June. The wettest month is July (110 mm4.3 in), the driest is May (1 mm0.0 in).
Relative humidity ranges from 29% in May to 60% in August. The clearest skies (lowest average cloud amount, 17%) are typical of May. 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 10.3 hours in December to 14.0 hours in June.
Best time to visit Hermosillo
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–March. Average highs then reach 23 °C73 °F to 28 °C83 °F. Precipitation is 9 mm0.3 in to 16 mm0.6 in per month.
The most challenging month is July, which is hot, with average highs of 37 °C99 °F.
Comfort score: months are ranked by how close they come to an ideal. That means 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 Hermosillo
- Winter (December–February) — highs 2373 to 25 °C77 °F, lows 847 to 9 °C48 °F, about 14 mm0.5 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Spring (March–May) — highs 2883 to 35 °C95 °F, lows 1153 to 18 °C64 °F, about 4 mm0.2 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 3697 to 39 °C103 °F, lows 2373 to 26 °C78 °F, about 74 mm2.9 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Autumn (September–November) — highs 2781 to 36 °C96 °F, lows 1355 to 23 °C74 °F, about 36 mm1.4 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.
How Hermosillo compares
World Climates covers 96 places in Mexico. By annual mean temperature, Hermosillo is the 42nd warmest of them. By annual precipitation, it is the 81st wettest. See all of them on the Mexico climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Tucson (United States, BSh), Phoenix (United States, BWh) and Mesa (United States, BWh).
Nearby places
- Climate in Heroica Guaymas 130 km · 25 °C77 °F · 341 mm13 in
- Climate in Ciudad Obregón 205 km · 25 °C78 °F · 394 mm16 in
- Climate in Nogales 247 km · 18 °C65 °F · 359 mm14 in
- Climate in Navojoa 270 km · 25 °C78 °F · 502 mm20 in
- Climate in Tucson 348 km · 21 °C70 °F · 324 mm13 in
- Climate in Cuauhtémoc 407 km · 14 °C58 °F · 483 mm19 in
- Climate in Los Mochis 415 km · 26 °C78 °F · 536 mm21 in
- Climate in Chihuahua 478 km · 19 °C66 °F · 371 mm15 in
Frequently asked questions
What is the warmest month in Hermosillo?
July is the warmest month in Hermosillo. Its average high is 37 °C (99 °F) and its average low is 26 °C (78 °F).
What is the coldest month in Hermosillo?
December is the coldest month. Its average high is 23 °C (73 °F) and its average low is 8 °C (47 °F).
When does it rain the most in Hermosillo?
July is the wettest month with about 110 mm (4.3 in) of precipitation. May is the driest with about 1 mm (0.0 in).
What is the best time to visit Hermosillo?
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. The gaps are largest 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.