Weather forecast for 10 daysLake San Marcos, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 84°F
- 61°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 10mphW 280°
- Humidity: 30%
- UV index: 6
- Sunrise: 6:55 am PDT
- Sunset: 6:12 pm PDT
- details ▼
On Sunday, October 18, sunny skies and pleasant visibility are expected.
The maximum predicted temperature is a moderately hot 84.2°F, while the minimum temperature will be a comfortable 60.8°F.
The expected high of 84.2°F appears seasonally off, better matching September's typical values.
Sunrise was at 6:55 am and sunset will be at 6:12 pm; the daylight will last for 11h and 16min.
The maximum predicted temperature is a moderately hot 84.2°F, while the minimum temperature will be a comfortable 60.8°F.
The expected high of 84.2°F appears seasonally off, better matching September's typical values.
Sunrise was at 6:55 am and sunset will be at 6:12 pm; the daylight will last for 11h and 16min.
10-day overview
Daily temperatures
Warmest day: today 84°C.
Coldest day: Thursday 68°C.
Coldest day: Thursday 68°C.
Chance of precipitation
Highest chance: Thursday 72%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 84°F
- 61°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 10mphW 280°
- Humidity: 30%
- UV index: 6
- Sunrise: 6:55 am PDT
- Sunset: 6:12 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 81°F
- 59°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 9mphSW 229°
- Humidity: 49%
- UV index: 6
- Sunrise: 6:56 am PDT
- Sunset: 6:10 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 77°F
- 63°F
Sunny
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 9mphSW 217°
- Humidity: 66%
- UV index: 6
- Sunrise: 6:57 am PDT
- Sunset: 6:09 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 75°F
- 61°F
PM Showers
- Precip. probability: 48%
- Precipitation: 0.39"
- Wind: 11mphSSW 196°
- Humidity: 66%
- UV index: 6
- Sunrise: 6:58 am PDT
- Sunset: 6:08 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 68°F
- 57°F
Thundershowers
- Precip. probability: 72%
- Precipitation: 0.16"
- Wind: 9mphSW 219°
- Humidity: 71%
- UV index: 5
- Sunrise: 6:58 am PDT
- Sunset: 6:07 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 72°F
- 57°F
Mostly Sunny
- Precip. probability: 8%
- Precipitation: 0"
- Wind: 9mphW 263°
- Humidity: 63%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:06 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 77°F
- 59°F
Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 8mphNW 311°
- Humidity: 51%
- 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: 4%
- Precipitation: 0"
- Wind: 9mphWSW 250°
- Humidity: 50%
- UV index: 5
- Sunrise: 7:01 am PDT
- Sunset: 6:04 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 75°F
- 59°F
Partly Cloudy
- Precip. probability: 12%
- Precipitation: 0"
- Wind: 9mphSW 224°
- Humidity: 54%
- UV index: 5
- Sunrise: 7:02 am PDT
- Sunset: 6:03 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 73°F
- 57°F
Partly Cloudy
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 9mphWSW 248°
- Humidity: 54%
- UV index: 5
- Sunrise: 7:03 am PDT
- Sunset: 6:02 pm PDT
- details ▼
And a mix of clear, overcast, wet and lightning-active weather is expected.
Rain is predicted for Wednesday and Thursday.
There will be a considerable variation in temperature over the next several days. Highs will range from 68°F to 84.2°F, while fluctuations in the night’s lowest temperature will be minimal, as the minimum temperature is expected to range between 57.2°F and 62.6°F.
Today is the hottest day, with a maximum temperature of 84.2°F; expect the coldest day on Thursday with a high of 68°F.
Rain is predicted for Wednesday and Thursday.
There will be a considerable variation in temperature over the next several days. Highs will range from 68°F to 84.2°F, while fluctuations in the night’s lowest temperature will be minimal, as the minimum temperature is expected to range between 57.2°F and 62.6°F.
Today is the hottest day, with a maximum temperature of 84.2°F; expect the coldest day on Thursday with a high of 68°F.
Updated: Oct 18, 2026 @ 16:03:59 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, in Lake San Marcos, bright and sunny weather is expected.
Today, the highest temperature will be 84.2°F, while the lowest temperature will be 60.8°F.
The maximum temperature will be a couple of degrees higher than the average highest temperature of 75.4°F in October. The lowest temperature will be in line with the average low of 58.8°F.
The maximum temperature will be a couple of degrees higher than the average highest temperature of 75.4°F in October. The lowest temperature will be in line with the average low of 58.8°F.
On Sunday, in Lake San Marcos, sunrise was at 6:55 am and sunset will be at 6:12 pm (PDT).
In Lake San Marcos, the length of the day today will be 11h and 16min.
