Climate averages 1991–2020
Hermosillo weather
in December.
A warm, fairly dry month: the coolest and the joint 8th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Hermosillo: daytime highs average 23.1°C and nights cool to about 9.4°C. By daytime temperature it is the coolest month of the year.
Expect about 19 mm of rain on roughly 2 days, which makes December a fairly dry month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 19 min on an average December day.
The nearest other city in this atlas is Heroica Guaymas (130 km away). In December its highs average 22.0°C, 1.1°C cooler than Hermosillo, with 12 mm of rain.
Among the 153 cities listed in Mexico, Hermosillo ranks joint 64th of 153 for the warmest December highs and joint 100th of 153 for the driest December (rainfall, lowest first). The mean December high of those 153 cities is 22.7°C; Hermosillo is 0.4°C warmer than that mean.
From December to January, average highs rise by 0.8°C to 23.8°C, and monthly rainfall falls from 19 mm to 12 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hermosillo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 23.8°C9.4°C | 9.4°C | 12 | 1.6 | 10.511 h |
| February | 25.0°C10.3°C | 10.3°C | 15 | 2.0 | 11.111 h |
| March | 28.5°C12.3°C | 12.3°C | 6.5 | 0.8 | 12.012 h |
| April | 31.7°C14.9°C | 14.9°C | 1.4 | 0.4 | 12.813 h |
| May | 35.2°C18.1°C | 18.1°C | 0.4 | 0.1 | 13.614 h |
| June | 39.1°C23.3°C | 23.3°C | 3.3 | 1.1 | 14.014 h |
| July | 38.3°C26.6°C | 26.6°C | 40 | 7.6 | 13.814 h |
| August | 37.6°C26.6°C | 26.6°C | 51 | 9.8 | 13.213 h |
| September | 36.0°C24.5°C | 24.5°C | 52 | 7.1 | 12.412 h |
| October | 33.2°C19.1°C | 19.1°C | 19 | 2.1 | 11.511 h |
| November | 27.9°C13.5°C | 13.5°C | 13 | 1.5 | 10.711 h |
| December, selected | 23.1°C9.4°C | 9.4°C | 19 | 1.9 | 10.310 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Heroica Guaymas in DecemberMexico · 130 kmHigh 22.0°C · Low 13.5°C · 12 mm rain
- Ciudad Obregón in DecemberMexico · 205 kmHigh 25.5°C · Low 11.0°C · 17 mm rain
- Nogales in DecemberMexico · 247 kmHigh 15.8°C · Low 2.1°C · 37 mm rain
- Navojoa in DecemberMexico · 270 kmHigh 26.1°C · Low 11.3°C · 18 mm rain
- Agua Prieta in DecemberMexico · 284 kmHigh 15.8°C · Low 2.5°C · 29 mm rain
- Tucson in DecemberUnited States · 348 kmHigh 17.1°C · Low 3.8°C · 31 mm rain
- Cuauhtémoc in DecemberMexico · 407 kmHigh 14.7°C · Low 1.2°C · 10 mm rain
- Los Mochis in DecemberMexico · 415 kmHigh 25.8°C · Low 14.2°C · 12 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hermosillo) is explained once on the Hermosillo year overview and on the Sources, method and limits page.