Observed 1:50 PM EDT at KOXC

Derby, CT weather

Sunny and 57°14°, jacket by 6 PM.

Mostly agree

Now 57°14°

Sunny

Wind: 6 mph9 km/h; From the north-northeast. Up to 8 mph13 km/h through 2 AM
Dew point: 27°−3°; Dry, static shocks likely
UV index: 3Moderate; Moderate until 3 PM · peak 4
Air quality: 28Good; Main pollutant: Ozone
Pressure: 30.35 inHg1028 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

High 58°14° today at 3 PM
Below 50°10° tonight after 7 PM
Low 33°1° tomorrow at 7 AM
Above 50°10° tomorrow by 11 AM

This afternoonNear 57°14° · Clear
TonightDown to 34°1° by 5 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 60°16° by 2 PM · Mostly cloudy
Tomorrow nightDown to 34°1° by 4 AM · Clear
Sunday morningUp to 57°14° by 11 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Fri 2p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	9 mph14 km/h from N, gusts 16 mph25 km/h	34%	0%	3
Fri 3p	Sunny	58°14° (likely 58°14° to 60°16°)	58°14°	0%	8 mph13 km/h from N, gusts 14 mph23 km/h	33%	0%	2
Fri 4p	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	8 mph13 km/h from N, gusts 14 mph23 km/h	34%	0%	1
Fri 5p	Sunny	57°14° (likely 56°13° to 58°14°)	57°14°	0%	6 mph10 km/h from N, gusts 11 mph18 km/h	34%	0%	0
Fri 6p	Clear	52°11° (likely 51°11° to 55°13°)	52°11°	0%	3 mph5 km/h from NE, gusts 9 mph15 km/h	41%	0%	0
Fri 7p	Clear	49°9° (likely 49°9° to 51°11°)	49°9°	0%	2 mph3 km/h from NE, gusts 9 mph14 km/h	48%	0%	0
Fri 8p	Clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	2 mph3 km/h from NE, gusts 8 mph12 km/h	53%	0%	0
Fri 9p	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	2 mph3 km/h from N, gusts 7 mph12 km/h	57%	5%	0
Fri 10p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	60%	9%	0
Fri 11p	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	65%	14%	0
Sat 12a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	67%	12%	0
Sat 1a	Mostly clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	67%	21%	0
Sat 2a	Clear	37°3° (likely 37°3° to 43°6°)	37°3°	0%	2 mph3 km/h from N, gusts 7 mph12 km/h	72%	24%	0
Sat 3a	Clear	36°2° (likely 36°2° to 42°6°)	36°2°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	72%	41%	0
Sat 4a	Clear	35°2° (likely 35°2° to 42°6°)	35°2°	0%	2 mph3 km/h from N, gusts 8 mph13 km/h	75%	41%	0
Sat 5a	Partly cloudy	34°1° (likely 34°1° to 41°5°)	34°1°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	78%	46%	0
Sat 6a	Partly cloudy	34°1° (likely 34°1° to 40°4°)	34°1°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	78%	60%	0
Sat 7a	Partly sunny	33°1° (likely 33°1° to 40°4°)	33°1°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	82%	71%	0
Sat 8a	Cloudy	34°1° (likely 34°1° to 41°5°)	34°1°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	78%	73%	0
Sat 9a	Partly sunny	44°7° (likely 42°6° to 46°8°)	44°7°	0%	2 mph3 km/h from N, gusts 5 mph9 km/h	55%	73%	1
Sat 10a	Cloudy	49°9° (likely 48°9° to 51°11°)	49°9°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	48%	80%	2
Sat 11a	Cloudy	54°12° (likely 52°11° to 55°13°)	54°12°	0%	3 mph5 km/h from NW, gusts 6 mph10 km/h	41%	78%	3
Sat 12p	Cloudy	56°13° (likely 55°13° to 58°14°)	56°13°	0%	3 mph5 km/h from NW, gusts 8 mph12 km/h	38%	78%	3
Sat 1p	Cloudy	58°14° (likely 56°13° to 60°16°)	58°14°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	37%	73%	3
Sat 2p	Partly sunny	60°16° (likely 58°14° to 62°17°)	60°16°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	35%	67%	4
Sat 3p	Mostly sunny	60°16° (likely 58°14° to 63°17°)	60°16°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	35%	57%	3
Sat 4p	Mostly sunny	60°16° (likely 59°15° to 62°17°)	60°16°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	33%	49%	2
Sat 5p	Mostly sunny	59°15° (likely 57°14° to 61°16°)	59°15°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	34%	42%	1
Sat 6p	Clear	56°13° (likely 53°12° to 56°13°)	56°13°	0%	2 mph3 km/h from W, gusts 5 mph7 km/h	40%	40%	0
Sat 7p	Clear	52°11° (likely 49°9° to 53°12°)	52°11°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	46%	36%	0
Sat 8p	Mostly clear	45°7° (likely 45°7° to 52°11°)	45°7°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	63%	16%	0
Sat 9p	Clear	42°6° (likely 42°6° to 51°11°)	42°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	70%	0%	0
Sat 10p	Clear	40°4° (likely 40°4° to 49°9°)	40°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	76%	0%	0
Sat 11p	Clear	39°4° (likely 39°4° to 48°9°)	39°4°	0%	1 mph2 km/h from NW, gusts 5 mph7 km/h	79%	0%	0
Sun 12a	Clear	38°3° (likely 38°3° to 47°8°)	38°3°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	82%	0%	0
Sun 1a	Clear	36°2° (likely 36°2° to 46°8°)	36°2°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	89%	0%	0
Sun 2a	Clear	35°2° (likely 35°2° to 45°7°)	35°2°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	92%	0%	0
Sun 3a	Clear	35°2° (likely 35°2° to 44°7°)	35°2°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	89%	0%	0
Sun 4a	Clear	34°1° (likely 34°1° to 43°6°)	34°1°	0%	1 mph2 km/h from NW, gusts 7 mph11 km/h	92%	0%	0
Sun 5a	Clear	34°1° (likely 34°1° to 43°6°)	34°1°	0%	1 mph2 km/h from NW, gusts 7 mph11 km/h	89%	0%	0
Sun 6a	Clear	34°1° (likely 34°1° to 42°6°)	34°1°	0%	1 mph2 km/h from NW, gusts 7 mph11 km/h	89%	0%	0
Sun 7a	Sunny	34°1° (likely 34°1° to 42°6°)	34°1°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	89%	0%	0
Sun 8a	Sunny	36°2° (likely 35°2° to 44°7°)	36°2°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	85%	0%	0
Sun 9a	Sunny	43°6° (likely 41°5° to 50°10°)	43°6°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	70%	0%	1
Sun 10a	Sunny	50°10° (likely 48°9° to 55°13°)	50°10°	0%	2 mph3 km/h from NW, gusts 5 mph9 km/h	58%	0%	2
Sun 11a	Sunny	57°14° (likely 54°12° to 60°16°)	57°14°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	49%	0%	3
Sun 12p	Sunny	60°16° (likely 56°13° to 63°17°)	60°16°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	46%	0%	4
Sun 1p	Sunny	62°17° (likely 57°14° to 65°18°)	62°17°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	43%	0%	4

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 23. Sunny. High 58°14°, low 33°1°. Typical 62°17° / 46°8°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Sunny, 58°14°
  Dry
2. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 34°1°
  Dry
Official NWS forecast
Today: Sunny, with a high near 58. North wind 6 to 9 mph.
Tonight: Widespread frost after midnight. Mostly clear, with a low around 33. North wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–60°16°
Low, likely
33°1°–45°7°
Typical high / low
62°17° / 46°8°
Wind
12 mph19 km/h, gusts 33 mph54 km/h
UV peak
4
Tomorrow, Oct 24. Cloudy. High 60°16°, low 33°1°. Typical 62°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 34°1°
  Dry
Official NWS forecast
Day: Widespread frost before 9am. Mostly sunny, with a high near 60. Northwest wind around 5 mph.
Night: Areas of frost after 1am. Clear, with a low around 33. Northwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
33°1°–40°4°
Typical high / low
62°17° / 45°7°
Wind
7 mph11 km/h, gusts 12 mph20 km/h
UV peak
4
Sunday, Oct 25. Sunny. High 64°18°, low 36°2°. Typical 61°16° / 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny. High near 64, with temperatures falling to around 61 in the afternoon. West wind around 3 mph.
Night: Clear. Low around 36, with temperatures rising to around 38 overnight.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–66°19°
Low, likely
33°1°–42°6°
Typical high / low
61°16° / 45°7°
Wind
6 mph9 km/h, gusts 11 mph18 km/h
UV peak
4
Monday, Oct 26. Sunny. High 68°20°, low 44°7°. Typical 61°16° / 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 42°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy frost between 7am and 8am. Sunny, with a high near 68.
Night: Clear, with a low around 44.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
63°17°–69°21°
Low, likely
37°3°–46°8°
Typical high / low
61°16° / 45°7°
Wind
8 mph13 km/h, gusts 24 mph39 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 60°16°, low 34°1°. Typical 60°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 60.
Night: Mostly clear, with a low around 34.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
56°13°–61°16°
Low, likely
34°1°–47°8°
Typical high / low
60°16° / 44°7°
Wind
10 mph16 km/h, gusts 27 mph43 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 57°14°, low 38°3°. Typical 60°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 49°10°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 57.
Night: Partly cloudy, with a low around 38.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
52°11°–57°14°
Low, likely
38°3°–41°5°
Typical high / low
60°16° / 44°7°
Wind
9 mph14 km/h, gusts 14 mph23 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 62°17°, low 43°6°. Typical 60°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62.
Night: Partly cloudy, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
43°6°–49°9°
Typical high / low
60°16° / 44°7°
Wind
12 mph19 km/h, gusts 24 mph38 km/h
UV peak
4
Friday, Oct 30. Cloudy. High 66°19°, low 50°10°. Typical 59°15° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 48°9°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–69°21°
Low, likely
48°9°–51°11°
Typical high / low
59°15° / 43°6°
Wind
10 mph15 km/h, gusts 19 mph30 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 62°17°, low 46°8°. Typical 59°15° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–65°18°
Low, likely
42°6°–51°11°
Typical high / low
59°15° / 43°6°
Wind
12 mph19 km/h, gusts 22 mph35 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 59°15°, low 46°8°. Typical 59°15° / 43°6°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
56°13°–64°18°
Low, likely
41°5°–51°11°
Typical high / low
59°15° / 43°6°
Wind
11 mph18 km/h, gusts 27 mph43 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 58°, low 33°.
Tomorrow
Dry, high 60°, low 33°.
Sunday
Dry, high 64°, low 36°, warming up.
Rest of week
Mostly dry, highs 57–68°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (OKX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Housatonic River at Stevenson

6.0 mi

Below flood stage

Level: 2.6 ft
Flow: 502 cfs

Forecast peak 6.7 ft Sat 8 PM

Reading from Fri 12:30 PM · NWS gauge page

Naugatuck River at Beacon Falls

8.1 mi

Below flood stage

Level: 1.6 ft
Flow: 129 cfs

Forecast peak 1.6 ft Fri 2 PM

Reading from Fri 12:30 PM · NWS gauge page

Housatonic River above Seymour Wellfield

3.0 mi

Level: 24.8 ft

Reading from Fri 12:37 PM · NWS gauge page

Peat Swamp Reservoir above Peat Swamp Reservoir

3.3 mi

Level: -9.2 ft

Reading from Fri 12:37 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 55% less heating than a typical week.

This week 39Typical 86

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 28
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 10 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 27°F).

Open the windows?

Sat, 2:00 PM–4:00 PM

Good stretch to open the windows.

Is this typical?

Igor I Sikorsky Memorial Airport · official normals 1991–2020 · records 1948–2026

Oct 23, today vs a typical year

Today’s expected high is 4°2° colder than typical.

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−6°−4°SatOct 17
−8°−4°SunOct 18
−3°−2°MonOct 19
±0°TueOct 20
+2°+1°WedOct 21
+2°+1°ThuOct 22
—FriOct 23

Derby weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 35 min less
Golden hour: 5:21–6:16 PM; Morning 6:55–7:51 AM
Blue hour: 6:16–6:27 PM; Morning 6:45–6:55 AM; first light 6:45 AM

Stars tonight? Fair

Mostly clear 6:27 PM–3 AM, but the moon is 95% lit and up.

Moon

Waxing gibbous

93% lit · growing

Today: sets 4:15 AM · rises 4:31 PM
Full moon: Oct 26
New moon: Nov 9

Looking northwest from Derby. The highest point on the skyline is about 900 ft, 3 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.