Hermosillo climate — normals and trends
Hermosillo (Mexico) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 24.0 °C and it receives 202 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (32.2 °C on average) and the coldest is January (15.5 °C). Rainfall peaks in August.
Hermosillo averages 0 frost days, 220 hot days (≥ 30 °C) and 34 rainy days per year.
Hermosillo has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 46.8 °C (on 4 June 2016) and the coldest -1.8 °C (on 5 January 1949).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
HermosilloSonora
- coords
- 29.09°, -110.97°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
24.0°C
Average daily high
31.5°C
Average daily low
17.1°C
Annual rainfall
202mm
Sunshine / day
11.3h
Mean relative humidity
44%
Average peak wind
16.3km/h
Seasonal range
16.7°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
220 d/yr
Rainy days (≥ 1 mm)
34 d/yr
Annual snowfall
0.0 cm
Average feels-like high
31.0 °C
Average feels-like low
16.3 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
134 d/yr
Solar radiation
21.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.38 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
46.8 °C
4 June 2016
Coldest day
-1.8 °C
5 January 1949
Wettest day
89 mm
18 August 2022
Windiest day
55.0 km/h
7 September 2016
Strongest gust
110.5 km/h
7 September 2016
Hottest feels-like
49.9 °C
24 August 2010
Coldest feels-like
-7.7 °C
3 February 2011
Sunniest day
13.3 h
9 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 23.7 °C | +0.3 °C | 0 mm | -14 mm |
| Feb | 29.6 °C | +4.4 °C | 0 mm | -11 mm |
| Mar | 29.5 °C | +1.8 °C | 0 mm | -7 mm |
| Apr | 32.1 °C | +0.8 °C | 0 mm | -2 mm |
| May | 35.2 °C | +0.5 °C | 0 mm | -1 mm |
| Jun | 39.7 °C | +1.1 °C | 3 mm | +1 mm |
| Jul | 39.8 °C | +1.3 °C | 11 mm | -24 mm |
| Aug | 39.8 °C | +2.3 °C | 29 mm | -21 mm |
| Sep | 36.4 °C | -0.2 °C | 110 mm | +71 mm |
| Oct | 34.3 °C | +1.0 °C | 52 mm | +37 mm |
| Nov | 30.7 °C | +2.8 °C | 3 mm | -6 mm |
| Dec | 28.7 °C | +5.0 °C | 3 mm | -14 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Hermosillo?
Hermosillo has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 24.0 °C and it receives 202 mm of precipitation per year.
What is the hottest day ever recorded in Hermosillo?
The hottest day measured in Hermosillo between 1940 and 2025 was 4 June 2016, reaching 46.8 °C.
What is the coldest day in Hermosillo?
The coldest day measured in Hermosillo between 1940 and 2025 was 5 January 1949, at -1.8 °C.
Does it snow in Hermosillo?
Almost never: Hermosillo sees virtually no snow, with about 0 frost days per year.
Has the climate of Hermosillo warmed?
Yes: Hermosillo warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hermosillo?
The wettest day measured in Hermosillo between 1940 and 2025 was 18 August 2022, with 89 mm of rain in 24 hours.
What was the windiest day in Hermosillo?
The windiest day measured in Hermosillo between 1940 and 2025 was 7 September 2016, with winds reaching 55.0 km/h.
What is the warmest month in Hermosillo?
The warmest month in Hermosillo is July (32.2 °C on average); the coldest is January (15.5 °C).
How much does it rain in Hermosillo?
Hermosillo receives on average 202 mm of precipitation per year, spread over about 34 rainy days.
Is it sunny in Hermosillo?
Hermosillo gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
Are there tropical nights in Hermosillo?
Yes: Hermosillo has on average 134 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hermosillo?
In Hermosillo, between 1940 and 2025, the highest apparent temperature reached 49.9 °C on 24 August 2010, and the lowest was -7.7 °C on 3 February 2011.
Compare Hermosillo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hermosillo