Climate averages 1991–2020
Merced weather
by month.
See how the year changes. July has the highest average daily maximum; July (tied with August) has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: MarchAprilMayOctoberNovember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Merced averages a daytime high of 24.6°C and a nighttime low of 11.7°C, with about 432 mm of rain on roughly 48 days. July is the warmest month (average high 36.2°C) and December the coolest (13.9°C). January is the wettest month with 90 mm; July (tied with August) is the driest with under 1 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): March, April, May, October and November. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Merced
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
Merced climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.2°C4.3°C | 4.3°C | 90 | 8.1 | 9.910 h |
| February | 16.0°C5.6°C | 5.6°C | 80 | 8.5 | 10.811 h |
| March | 18.9°C7.6°C | 7.6°C | 71 | 7.7 | 11.912 h |
| April | 22.5°C9.9°C | 9.9°C | 32 | 4.7 | 13.113 h |
| May | 27.8°C13.7°C | 13.7°C | 19 | 2.8 | 14.114 h |
| June | 32.9°C17.3°C | 17.3°C | 3.6 | 0.6 | 14.715 h |
| July | 36.2°C20.2°C | 20.2°C | 0.6 | 0.2 | 14.514 h |
| August | 35.3°C19.6°C | 19.6°C | 0.6 | 0.1 | 13.614 h |
| September | 32.2°C17.3°C | 17.3°C | 1.7 | 0.4 | 12.512 h |
| October | 26.0°C12.7°C | 12.7°C | 21 | 2.3 | 11.311 h |
| November | 18.7°C7.6°C | 7.6°C | 37 | 4.8 | 10.210 h |
| December | 13.9°C4.4°C | 4.4°C | 75 | 7.4 | 9.610 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
Nearby cities
- TurlockUnited States · 39 kmHigh 24.4°C · Low 11.7°C · 433 mm rain a year
- ModestoUnited States · 59 kmHigh 24.0°C · Low 11.3°C · 464 mm rain a year
- MantecaUnited States · 85 kmHigh 23.2°C · Low 10.6°C · 420 mm rain a year
- ClovisUnited States · 87 kmHigh 24.6°C · Low 11.5°C · 427 mm rain a year
- FresnoUnited States · 88 kmHigh 24.9°C · Low 12.2°C · 427 mm rain a year
- TracyUnited States · 96 kmHigh 23.6°C · Low 10.7°C · 427 mm rain a year
- StocktonUnited States · 102 kmHigh 23.1°C · Low 10.5°C · 516 mm rain a year
- LivermoreUnited States · 121 kmHigh 21.6°C · Low 10.0°C · 436 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-8, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 37.30°, -120.50° (2 km from the city centre). Rain comes from the 0.25° cell at 37.25°, -120.50°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.