Smithtown Weather Forecast 15 Days, Weather in Smithtown Today

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5. Weather in Smithtown for 15 days

Current weather conditions and 15 day weather forecast for Smithtown, New York, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.

Current weather conditions at Smithtown

21 December 2025 Sunday 1.7 ° C / 35.1°F Clear

Feels Like : -4.8 ° C / 23.4°F Humidity : % 36 Pressure : 1023 mb Wind Speed : 36 kmph / 22.4 miles from NW Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 25

15 day weather forecast for Smithtown, NY, USA

Weather Forecast for next 15 Days for Smithtown including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.
Here is weather for the next 15 days in Smithtown, New York state, US. To see the daily forecast, scroll to the table below.

Date	Weather forecast	Low temperature	High temperature	Avg. temperature	Humidity	Chance of rain	UV Index	Sun Position	Moon Position
21 December 2025 Sunday	Sunny	-0.6 ° C (31°F)	8.6 ° C (47.5°F)	3.4 ° C (38°F)	% 66	0%	0.3	Sunrise:07:14 AM Sunset: 04:27 PM	Moonrise:08:49 AM Moonset: 05:45 PM Moon Phase ( Waxing Crescent )
22 December 2025 Monday	Sunny	-2.3 ° C (27.9°F)	3.1 ° C (37.6°F)	0.2 ° C (32.4°F)	% 69	0%	0.3	Sunrise:07:14 AM Sunset: 04:28 PM	Moonrise:09:26 AM Moonset: 06:50 PM Moon Phase ( Waxing Crescent )
23 December 2025 Tuesday	Patchy rain nearby	0.3 ° C (32.5°F)	3.8 ° C (38.8°F)	2.1 ° C (35.8°F)	% 83	88%	0	Sunrise:07:15 AM Sunset: 04:28 PM	Moonrise:09:56 AM Moonset: 07:57 PM Moon Phase ( Waxing Crescent )
24 December 2025 Wednesday	Partly Cloudy	1.7 ° C (35.1°F)	4 ° C (39.2°F)	3.1 ° C (37.7°F)	% 72	0%	0.2	Sunrise:07:15 AM Sunset: 04:29 PM	Moonrise:10:22 AM Moonset: 09:05 PM Moon Phase ( Waxing Crescent )
25 December 2025 Thursday	Patchy rain nearby	2.4 ° C (36.3°F)	4.7 ° C (40.4°F)	3.3 ° C (37.9°F)	% 82	72%	0	Sunrise:07:16 AM Sunset: 04:29 PM	Moonrise:10:45 AM Moonset: 10:11 PM Moon Phase ( Waxing Crescent )
26 December 2025 Friday	Patchy rain nearby	4 ° C (39.2°F)	10.8 ° C (51.4°F)	7.6 ° C (45.6°F)	% 91	68%	2	Sunrise:07:16 AM Sunset: 04:30 PM	Moonrise:11:07 AM Moonset: 11:20 PM Moon Phase ( Waxing Crescent )
27 December 2025 Saturday	Partly Cloudy	-0.8 ° C (30.6°F)	0.8 ° C (33.5°F)	0.6 ° C (33.1°F)	% 46	0%	2	Sunrise:07:16 AM Sunset: 04:31 PM	Moonrise:11:29 AM Moonset: No moonset Moon Phase ( First Quarter )
28 December 2025 Sunday	Overcast	-0.6 ° C (31°F)	6.4 ° C (43.4°F)	3.3 ° C (38°F)	% 62	0%	1	Sunrise:07:17 AM Sunset: 04:32 PM	Moonrise:11:52 AM Moonset: 12:29 AM Moon Phase ( Waxing Gibbous )
29 December 2025 Monday	Sunny	-5.1 ° C (22.8°F)	-2.4 ° C (27.8°F)	-3.3 ° C (26.1°F)	% 47	0%	2	Sunrise:07:17 AM Sunset: 04:32 PM	Moonrise:12:18 PM Moonset: 01:43 AM Moon Phase ( Waxing Gibbous )
30 December 2025 Tuesday	Partly Cloudy	-5.7 ° C (21.7°F)	-1.5 ° C (29.4°F)	-3.6 ° C (25.6°F)	% 46	0%	2	Sunrise:07:17 AM Sunset: 04:33 PM	Moonrise:12:51 PM Moonset: 03:00 AM Moon Phase ( Waxing Gibbous )
31 December 2025 Wednesday	Moderate rain	-1 ° C (30.2°F)	4.5 ° C (40.1°F)	1.4 ° C (34.5°F)	% 84	75%	1	Sunrise:07:17 AM Sunset: 04:34 PM	Moonrise:01:34 PM Moonset: 04:20 AM Moon Phase ( Waxing Gibbous )
01 January 2026 Thursday	Patchy rain nearby	0.9 ° C (33.7°F)	2.9 ° C (37.2°F)	1.9 ° C (35.4°F)	% 92	78%	1	Sunrise:07:17 AM Sunset: 04:35 PM	Moonrise:02:27 PM Moonset: 05:39 AM Moon Phase ( Waxing Gibbous )
02 January 2026 Friday	Sunny	-0.2 ° C (31.6°F)	1.5 ° C (34.8°F)	0.9 ° C (33.6°F)	% 76	0%	2	Sunrise:07:17 AM Sunset: 04:36 PM	Moonrise:03:34 PM Moonset: 06:50 AM Moon Phase ( Waxing Gibbous )
03 January 2026 Saturday	Partly Cloudy	0.4 ° C (32.8°F)	2.8 ° C (37°F)	1.7 ° C (35.1°F)	% 79	0%	2	Sunrise:07:17 AM Sunset: 04:37 PM	Moonrise:04:50 PM Moonset: 07:49 AM Moon Phase ( Full Moon )

Smithtown Weather forecasts are usually fully updated every 4 hours.

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