Weather forecast for 10 daysSan Marcos, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 86°F
- 61°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 11mphNNW 339°
- Humidity: 33%
- UV index: 6
- Sunrise: 6:55 am PDT
- Sunset: 6:11 pm PDT
- details ▼
Today, the outlook remains bright and sunny.
A temperature range of a humid 86°F to a breezy 60.8°F is expected.
Today, the forecasted high will be higher and much closer to September's average high of 80.8°F than October's 75.4°F.
Sunrise will be at 6:55 am and sunset at 6:11 pm; the daylight will last for 11h and 16min.
A temperature range of a humid 86°F to a breezy 60.8°F is expected.
Today, the forecasted high will be higher and much closer to September's average high of 80.8°F than October's 75.4°F.
Sunrise will be at 6:55 am and sunset at 6:11 pm; the daylight will last for 11h and 16min.
10-day overview
Daily temperatures
Warmest day: today 86°C.
Coldest day: Thursday 68°C.
Coldest day: Thursday 68°C.
Chance of precipitation
Highest chance: Thursday 65%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 86°F
- 61°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 11mphNNW 339°
- Humidity: 33%
- UV index: 6
- Sunrise: 6:55 am PDT
- Sunset: 6:11 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 82°F
- 59°F
Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 9mphSW 234°
- Humidity: 45%
- UV index: 6
- Sunrise: 6:56 am PDT
- Sunset: 6:10 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 79°F
- 61°F
Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 9mphSW 221°
- Humidity: 60%
- UV index: 6
- Sunrise: 6:57 am PDT
- Sunset: 6:09 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 77°F
- 61°F
PM Showers
- Precip. probability: 50%
- Precipitation: 0.35"
- Wind: 11mphSSW 195°
- Humidity: 62%
- UV index: 6
- Sunrise: 6:58 am PDT
- Sunset: 6:08 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 68°F
- 55°F
Thundershowers
- Precip. probability: 65%
- Precipitation: 0.16"
- Wind: 9mphSW 220°
- Humidity: 70%
- UV index: 5
- Sunrise: 6:58 am PDT
- Sunset: 6:07 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 72°F
- 55°F
Mostly Sunny
- Precip. probability: 8%
- Precipitation: 0"
- Wind: 9mphW 271°
- Humidity: 64%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:06 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 79°F
- 57°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 8mphNW 319°
- Humidity: 48%
- UV index: 6
- Sunrise: 7:00 am PDT
- Sunset: 6:05 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 77°F
- 59°F
Partly Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 9mphWSW 237°
- Humidity: 50%
- UV index: 5
- Sunrise: 7:01 am PDT
- Sunset: 6:04 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 73°F
- 57°F
Partly Cloudy
- Precip. probability: 13%
- Precipitation: 0"
- Wind: 9mphSW 223°
- Humidity: 54%
- UV index: 5
- Sunrise: 7:02 am PDT
- Sunset: 6:03 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 72°F
- 57°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 9mphSW 228°
- Humidity: 56%
- UV index: 5
- Sunrise: 7:02 am PDT
- Sunset: 6:02 pm PDT
- details ▼
The weather will be unstable for the next ten days, and a mix of clear, gloomy, showery and lightning-active weather is expected.
Rainfall is forecasted for Wednesday and Thursday.
Significant changes in temperature are expected in the upcoming days. Forecast highs will fluctuate between 68°F and 86°F, while the overnight low will be nearly unchanged, as night temperatures will lie between 55.4°F and 60.8°F.
With a high of 86°F, today is the hottest day; expect the coldest day on Thursday with a high of 68°F.
Rainfall is forecasted for Wednesday and Thursday.
Significant changes in temperature are expected in the upcoming days. Forecast highs will fluctuate between 68°F and 86°F, while the overnight low will be nearly unchanged, as night temperatures will lie between 55.4°F and 60.8°F.
With a high of 86°F, today is the hottest day; expect the coldest day on Thursday with a high of 68°F.
Updated: Oct 18, 2026 @ 10:50:48 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, the outlook remains bright and sunny.
Today, the highest temperature will be 86°F, while the lowest temperature will be 60.8°F.
The highest temperature today will be significantly higher than the average maximum of 75.4°F in October. The lowest temperature today will be in line with the average low temperature.
The highest temperature today will be significantly higher than the average maximum of 75.4°F in October. The lowest temperature today will be in line with the average low temperature.
On Sunday, in San Marcos, sunrise will be at 6:55 am and sunset at 6:11 pm (PDT).
In San Marcos, the length of the day today will be 11h and 16min.
