KOAK TAF
Terminal aerodrome forecast for Oakland San Francisco Bay (OAK · KOAK), Oakland, CA. Issued 21 Sep 2026 0520Z, valid 0600Z to 1200Z, decoded period by period below. · Open on the map
All of Oakland San Francisco Bay — runways, frequencies, charts and live weatherTAF issued 21 Sep 2026 0520Z
valid 0600Z to 1200ZTAF KOAK 210520Z 2106/2212 25009KT P6SM OVC010 FM211900 26009KT P6SM BKN015 BKN200 FM212100 28012KT P6SM SCT015 SCT200 FM220400 28010KT P6SM OVC010
Times are UTC (Zulu), as they appear in the bulletin.
Period by period
| Period (UTC) | Change | Wind | Vis | Ceiling | Sky | Cat |
|---|---|---|---|---|---|---|
| 0600Z to 1900Z | Initial | 250° at 9 kt | 6+ SM | 1,000 ft OVC | Overcast at 1,000 ft AGL | MVFR |
| 1900Z to 2100Z | FM | 260° at 9 kt | 6+ SM | 1,500 ft BKN | Broken at 1,500 ft AGL, Broken at 20,000 ft AGL | MVFR |
| 2100Z to 0400Z | FM | 280° at 12 kt | 6+ SM | Clear | Scattered at 1,500 ft AGL, Scattered at 20,000 ft AGL | VFR |
| 0400Z to 1200Z | FM | 280° at 10 kt | 6+ SM | 1,000 ft OVC | Overcast at 1,000 ft AGL | MVFR |
What the change groups mean
- FM
- From — a rapid, permanent change to the conditions that follow.
What the categories mean
- MVFR
- Marginal VFR — ceiling 1,000 to 3,000 ft and/or visibility 3 to 5 SM.
- VFR
- Visual flight rules — ceiling above 3,000 ft and visibility greater than 5 SM.
Frequently asked
What is the current TAF for KOAK?
The forecast issued 21 Sep 2026 0520Z for Oakland San Francisco Bay reads: TAF KOAK 210520Z 2106/2212 25009KT P6SM OVC010 FM211900 26009KT P6SM BKN015 BKN200 FM212100 28012KT P6SM SCT015 SCT200 FM220400 28010KT P6SM OVC010
How far ahead does a TAF forecast?
A TAF covers a 24-hour period at most airports and 30 hours at larger ones, issued four times a day at 0000Z, 0600Z, 1200Z and 1800Z. It describes conditions within roughly 5 statute miles of the airport, not the surrounding area.
What do FM, BECMG and TEMPO mean?
FM (from) marks a rapid, permanent change at the stated time. BECMG (becoming) marks a gradual change over the stated window. TEMPO marks conditions expected for less than half the period, in spells of under an hour each. PROB30 and PROB40 give the probability of the conditions that follow.
More about KOAK
Forecasts from the US National Weather Service Aviation Weather Center. Times are UTC (Zulu). For planning and education only — always confirm with an official preflight briefing.
Something here wrong or out of date? Report a data problem.