In the first week, Sarnia can expect around 9–17 °C with 0 wet days (at least 1 mm). The second week looks cooler, by about 3 °C: around 10–14 °C on average. Warmest day: Thursday (29 Oct) at 23 °C; coldest night: Saturday (31 Oct) at 2 °C.
Weather models are reliable for the first few days, but small errors grow over time. That is why every day on this page is marked: days 1–3 are reliable, days 4–7 moderately so, and from day 8 onwards the forecast shows the direction of travel – a warmer or cooler spell, a wetter period – rather than the exact temperature of a given day.
In the first week, Sarnia can expect around 9–17 °C with 0 wet days (at least 1 mm). The second week looks cooler, by about 3 °C: around 10–14 °C on average. Warmest day: Thursday (29 Oct) at 23 °C; coldest night: Saturday (31 Oct) at 2 °C.
The models show at least 1 mm of rain on 2 of the next 10 days. The wettest day looks like Friday (6 Nov) with about 7.5 mm. From day 8 onwards this is a trend, not an exact daily figure.
Days 1–3 are usually reliable and days 4–7 moderately so. Beyond that the forecast shows the trend rather than exact daily values — check back each day.
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