EFSI — Seinäjoki Airport

fog forecast & climatology · Seinäjoki / Ilmajoki city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 36 hours of dense fog here (10-year average).

Fog hours per year
250 h below CAT I minima (2016–2026 average)
Fog season
September and October
Typical fog event
~1 h once it forms (middle half 1–3 h, n=1132)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Seinäjoki Airport spends 250 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in September and October. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~26 hJanFebruary: ~19 hFebMarch: ~14 hMarApril: ~11 hAprMay: ~10 hMayJune: ~9 hJunJuly: ~17 hJulAugust: ~31 hAugSeptember: ~36 hSepOctober: ~31 hOctNovember: ~30 hNovDecember: ~21 hDec
Fog season is year-round, peaking in September; fog is mostly a 11 PM–8 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 1 hour once it forms local time · 10-yr average

For flight operations

EFVS crews: the CHASE board ranks airports by live fog status, approach lighting, go-around height and flight time from your base. Forecast probabilities publish here per-airport once the calibrated model beats climatology on live verification — receipts on the scorecard. Methodology.

Sources: NOAA/NWS National Blend of Models guidance · METAR observations 2016–2026 (Iowa Environmental Mesonet) · FAA NASR. Machine access: data.json · llms.txt. Not for operational use.