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Siam, OH Weather Forecast
Siam, OH Weather Forecast Date: 748 PM EST Mon Nov 02 2026
The area/counties/county of: Seneca, including the cities of: Tiffin and Fostoria.or toggle through each period.
Tonight... Cloudy. A slight chance of showers this evening. Lows in the upper 50s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20%.
Tuesday... Partly cloudy in the morning, then clearing. Highs in the mid 70s. South winds around 15 mph with gusts up to 25 mph.
Tuesday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s. South winds 15 to 20 mph with gusts up to 30 mph.
Wednesday... Showers. Highs in the lower 70s. Temperature falling into the upper 60s in the afternoon. South winds around 20 mph with gusts up to 30 mph. Chance of rain near 100%.
Wednesday Night... Showers likely in the evening. Cooler with lows in the lower 50s. South winds 15 to 20 mph, becoming southwest around 10 mph after midnight. Chance of rain 70%.
Thursday... Partly cloudy. Highs in the mid 60s.
Thursday Night... Mostly cloudy. Lows in the upper 40s.
Friday... Mostly cloudy in the morning, then becoming partly sunny. A 40% chance of rain. Highs around 60.
Friday Night... Mostly cloudy. Lows in the lower 40s.
Saturday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the lower 50s.
Saturday Night... Mostly cloudy. Lows in the mid 30s.
Sunday... Partly sunny. Highs in the mid 50s.
Sunday Night... Mostly cloudy. Lows in the mid 30s.
POP = Probability of Precipitation
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