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Weather extremes

How extreme does Seaside's weather get?

The hottest, coldest, wettest and snowiest days Seaside has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 50+ years of daily weather observations (1971–present), from the Watsonville Wtr Wks station 36 km away. Updated through May 2026 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Seaside has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
110°F Sep 3, 2017

That is about 36°F hotter than a normal September afternoon in Seaside (typical high near 74°F).

The three most extreme on record

1 110°F Sep 3, 2017
2 107°F Sep 27, 2016
3 107°F Sep 7, 2020
❄️ Coldest night
0°F Apr 23, 1999

About 45°F colder than a normal April night in Seaside (typical low near 45°F).

The three most extreme on record

1 0°F Apr 23, 1999
2 12°F Dec 22, 1990
3 19°F Dec 23, 1990
🌧️ Most rain in one day
5.93 in Feb 14, 2000

More rain in a single day than Seaside usually gets in the whole month of February (typical February total about 4.5 in).

The three most extreme on record

1 5.93 in Feb 14, 2000
2 4.92 in Oct 14, 2009
3 4.23 in Jan 24, 2000
Most snow in one day
0.1 in Jan 2, 2009

Top recorded days

1 0.1 in Jan 2, 2009

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-10°10°30°50°70°90°110°130° all-time high 110°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Seaside's record heat sits well above even a hot day for the season — September's 110°F is about 36°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Seaside's warmest days reach the mid-70s°F and its coldest nights drop to the high 30s°F. But across the record it has gone as high as 110°F and as low as 0°F. A single day has delivered over 6 inches of rain or close to 0 inches of snow. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Salinas #2 (NOAA GHCN station USC00047668), about 17 km from the city centre.

How we build these numbers →