textproduct: Key West

KEY MESSAGES

-Light to gentle breezes will prevail through the next few days before a cold front early next week.

-Near seasonable temperatures and a mainly dry pattern are expected to continue through the weekend along with near seasonable humidity levels.

-The next, healthy cold front is forecast to push through the Florida Keys early next week. This will result in near nil rain chances, drop in humidity, and a period of below normal temperatures for the last day of 2025 and the first couple of days of the New Year 2026.

DISCUSSION

Issued at 955 PM EST Sat Dec 27 2025 Clear skies over the Keys this evening with temperatures generally around 70F at the airports, with a few interior spots on Big Pine Key already dipping into the mid 60s. Winds were light and variable over the Key Largo area as a late afternoon seabreeze dissipates. Further down, winds were calm or light from the north northeast. The upstream northerly flow at Harbor Bank Light was about half the speed of the previous two evenings. The evening sounding remained dry with a couple decent stable layers, with the lower tropospheric inversion having descended a bit closer to 2500 feet. While precipitable water was below 0.8 inches, a general increase in the 500-300 mb layer was noted...perhaps telegraphing the approach of cirrus now spreading across western Cuba.

Synoptically, 500 mb heights had risen slightly across Florida in the past 24 hours with slight falls along the western Gulf Coast, marking the slow eastward movement of the mid/upper ridge across across the Gulf. The lower troposheric anticyclone has again become more circular since its stretched appearance and centered a bit southeast of its upper altitude portion. Thus more stacked, and suggesting tonight will favor longer calm periods over the large island interiors and more impressive minimum temperatures closer to 60F.

MARINE

Issued at 955 PM EST Sat Dec 27 2025 There are no advisories nor headlines in the coastal waters forecast at the present time. From synopsis, weak high pressure will meander in the eastern Gulf over the next few days, resulting in light to gentle breezes. Mainland nocturnal land breezes may drive brief bouts of gentle to moderate northerlies in the morning. A healthy cold front is expected to move through the Keys towards the middle part of next week. This will lead to freshening northerly breezes throughout all the Florida Keys coastal waters.

AVIATION

(00Z TAFS) Issued at 955 PM EST Sat Dec 27 2025 VFR and dry conditions will prevail at EYW and MTH through the TAF period. Near surface winds from the north or north-northeast 5 knots or less will gradually becoming northeast to east-northeast during Sunday with speeds increasing slightly to 5 to 8 knots.

KEY WATCHES/WARNINGS/ADVISORIES

FL...None. GM...None.