Climate averages 1991–2020
San Marcos weather
in October.
A warm, fairly dry month: the 4th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
October is a warm month in San Marcos: daytime highs average 23.3°C and nights cool to about 13.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 17 mm of rain on roughly 3 days, which makes October a fairly dry month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 23 min on an average October day.
The nearest other city in this atlas is Escondido (8 km away). In October its highs average 24.8°C, 1.5°C warmer than San Marcos, with 20 mm of rain.
Among the 498 cities listed in the United States, San Marcos ranks joint 214th of 498 for the warmest October highs and joint 38th of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; San Marcos is 2.0°C warmer than that mean.
From October to November, average highs fall by 3.3°C to 20.0°C, and monthly rainfall rises from 17 mm to 28 mm.
The annual picture
October 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
San Marcos climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 16.8°C6.1°C | 6.1°C | 73 | 5.8 | 10.210 h |
| February | 16.7°C6.9°C | 6.9°C | 92 | 6.8 | 11.011 h |
| March | 17.6°C8.5°C | 8.5°C | 57 | 6.2 | 12.012 h |
| April | 19.1°C10.3°C | 10.3°C | 28 | 4.1 | 13.013 h |
| May | 20.7°C12.7°C | 12.7°C | 13 | 2.1 | 13.814 h |
| June | 23.2°C14.8°C | 14.8°C | 2.5 | 0.5 | 14.314 h |
| July | 25.8°C17.2°C | 17.2°C | 2.0 | 0.4 | 14.114 h |
| August | 26.9°C18.2°C | 18.2°C | 1.0 | 0.2 | 13.413 h |
| September | 26.2°C17.3°C | 17.3°C | 3.9 | 0.7 | 12.412 h |
| October, selected | 23.3°C13.7°C | 13.7°C | 17 | 2.6 | 11.411 h |
| November | 20.0°C9.4°C | 9.4°C | 28 | 3.5 | 10.510 h |
| December | 16.7°C6.2°C | 6.2°C | 54 | 5.1 | 10.010 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
October in nearby cities
- Escondido in OctoberUnited States · 8 kmHigh 24.8°C · Low 13.5°C · 20 mm rain
- Vista in OctoberUnited States · 10 kmHigh 24.7°C · Low 14.2°C · 17 mm rain
- Oceanside in OctoberUnited States · 21 kmHigh 22.9°C · Low 15.6°C · 13 mm rain
- Temecula in OctoberUnited States · 39 kmHigh 26.8°C · Low 13.2°C · 17 mm rain
- El Cajon in OctoberUnited States · 43 kmHigh 24.6°C · Low 14.6°C · 15 mm rain
- Murrieta in OctoberUnited States · 46 kmHigh 26.5°C · Low 13.2°C · 17 mm rain
- San Diego in OctoberUnited States · 48 kmHigh 23.0°C · Low 15.2°C · 12 mm rain
- Chula Vista in OctoberUnited States · 56 kmHigh 22.3°C · Low 15.3°C · 15 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 San Marcos) is explained once on the San Marcos year overview and on the Sources, method and limits page.
Vista lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.