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Sylvan Lake, FL Weather Forecast
Sylvan Lake, FL Weather Forecast Date: 345 PM EDT Wed Aug 12 2026
The area/counties/county of: Seminole, including the cities of: Altamonte Springs, Casselberry, Oviedo, Sanford, and Winter Springs.or toggle through each period.
Tonight... Partly cloudy through early morning then becoming mostly clear. A chance of showers and thunderstorms early in the evening, then a slight chance of showers and thunderstorms in the late evening and early morning. Lows in the upper 70s. Northwest winds around 5 mph becoming west in the late evening and overnight. Chance of rain 40%. Heat index values up to 100 early.
Thursday... Partly sunny with a chance of showers and thunderstorms. Highs in the mid 90s. West winds around 5 mph. Chance of rain 40%. Heat index values up to 107.
Thursday Night... Partly cloudy in the late evening and early morning then becoming clear. Lows in the upper 70s. Southwest winds around 5 mph in the late evening and early morning becoming light and variable.
Friday... Mostly sunny. A chance of showers and thunderstorms late in the afternoon and towards sunset. Highs in the mid 90s. Southwest winds around 5 mph becoming southeast late in the afternoon and towards sunset. Chance of rain 40%. Heat index values up to 107.
Friday Night... Clear. Lows in the upper 70s. South winds around 5 mph.
Saturday... Sunny late in the morning then becoming partly sunny. Highs in the mid 90s.
Saturday Night... Mostly clear. Lows in the upper 70s.
Sunday... Partly sunny. Hot. Highs in the mid 90s.
Sunday Night... Mostly clear. Lows in the upper 70s.
Monday... Partly sunny. A chance of showers and thunderstorms late in the afternoon and towards sunset. Hot. Highs in the mid 90s. Chance of rain 30%.
Monday Night... Partly cloudy. A slight chance of showers and thunderstorms in the late evening and early morning. Lows in the upper 70s. Chance of rain 20%.
Tuesday... Mostly sunny. A chance of showers and thunderstorms late in the afternoon and towards sunset. Hot. Highs in the mid 90s. Chance of rain 40%.
Tuesday Night... Partly cloudy. A slight chance of showers and thunderstorms in the late evening and early morning. Lows in the upper 70s. Chance of rain 20%.
POP = Probability of Precipitation
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