Guaymas, where it's located

The climate of Guaymas is sub-tropical desert, with a pleasantly warm winter from December to February, and a hot summer from April to October, within which there is a muggy and relatively rainy period from July to October.
The city is located in the state of Sonora, on the coast of the Gulf of California (or Cortés Sea), at the 27th parallel, south of Hermosillo. On colder winter nights, the temperature can drop to 6/7 °C (43/45 °F), but in some years to as low as 2/3 °C (35/36 °F), while during the day it remains mild.
Typically, the highest temperatures, even more than 40 °C (104 °F), occur in June, but then, in July and August, the humidity increases and the heat becomes oppressive. The minimum temperatures often remain around 30 °C (86 °F).
From June to November, but with a higher probability from August to October, Guaymas can be affected by hurricanes of the Pacific Ocean, which generally arrive weakened, but sometimes they can bring heavy rains, as happened with Hurricane Jimena in September 2009. In any case, hurricanes are rare in June, the month in which they are most frequent is September, and in the past they have never occurred in November.
The average temperature of the coldest month (January) is of 17.6 °C (63.7 °F), that of the warmest month (July) is of 32 °C (89.6 °F). Here are the average temperatures.
Guaymas - Average temperatures
Min (°C)121315182328292927221712
Max (°C)232427293234353534322823
Min (°F)545559647382848481726354
Max (°F)737581849093959593908273

Precipitation amounts to 220 millimeters (8.7 inches) per year: it is therefore scarce. It ranges from 0 mm (0 in) in the driest months (April, May, June) to 70 mm (2.8 in) in the wettest (August). The rains from July to September are due to the humid air that rises from the Gulf of California, and sometimes by the remnants of tropical cyclones that can reach the area. Here is the average precipitation.
Guaymas - Average precipitation

On average, there are around 2,900 sunshine hours per year. Here are the average sunshine hours per day.
Guaymas - Sunshine

The sea temperature ranges between 18 °C (64 °F) and 30.5 °C (87 °F). The sea is quite cold from December to April, while it becomes very warm from June to October. Here are the average sea temperatures.
Guaymas - Sea temperature
Temp (°C)181819212428303030282420
Temp (°F)646466707582868686827568


Best Time

Guaymas can be visited from mid-November to March, as it is the mildest season. During the day you can enjoy the sun, while in the evening you will need a sweater and a jacket.
For a beach holiday, you can go from mid-April to mid-May and in the first half of November.