Millbrook, United States — Weather in September 2026

Monthly climate averages for Millbrook, United States. Based on 10-year ERA5 reanalysis data.

Cfa Humid Subtropical
7.6 /10
Excellent

September is an excellent month in Millbrook

Climate Overview

Millbrook, United States in September has hot conditions, with highs reaching 31.2°C (88°F) and afternoons the warmest part of the day.

This month falls at the beginning of Autumn. Temperatures are at their seasonal peak.

Daily highs in September gradually drop from around 32°C (90°F) at the start to 30°C (86°F) by month's end.

Rainfall is heaviest during the middle of the month, while the last third tends to be drier.

Expect around 10.6h of sunshine at the start of September, decreasing to 10.0h by the end.

The warmest days tend to fall around the 3th, averaging 32.3°C (90°F).

Compared to August, this month is about 2°C cooler with 7 fewer rainy days. Temperatures begin dropping heading into October.

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Monthly September Averages

Temperature
31°C / 21°C
Feels Like
34°C / 24°C
Rain
7 days · 72 mm
Sunshine
10h / day
Humidity
67% — Muggy
Wind
12 km/h
Wind Direction
ENE (64°)
Gusts
30 km/h
Daylight
12.4 h
Cloud Cover
45%
Clear Sky Days
7.8
UV Index
6.7 — High
Dew Point
20°C — Humid
Moon Phase
Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

40°C 36°C 32°C 28°C 24°C 20°C 16°C 12°C 151015202530
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 8 mm 10 mm 151015202530
Rainfall

Daily Sunshine

0h 3h 6h 9h 12h 151015202530
Sunshine

Daily Wind Speed

0 4 8 12 16 20 151015202530
Wind Speed
Sun Position
Sunrise 06:31
Daylight 12.4h
Sunset 18:54

Compare Months

January
Fair
Temp
14°C / 5°C
Feels Like
12°C / 2°C
Rain
11days (137 mm) Wet
Sun
6.7h Fair
Humidity
74% Muggy
UV
3.6 Moderate
Snow Days
1days
View Details
February
Good
Temp
18°C / 8°C
Feels Like
17°C / 6°C
Rain
10days (113 mm) Wet
Sun
6.7h Fair
Humidity
75% Muggy
UV
4.6 Moderate
View Details
March
Good
Temp
21°C / 10°C
Feels Like
21°C / 9°C
Rain
11days (114 mm) Wet
Sun
8.3h Good
Humidity
72% Muggy
UV
5.8 High
View Details
April best
Excellent
Temp
24°C / 13°C
Feels Like
25°C / 12°C
Rain
8days (109 mm) Wet
Sun
9.9h Good
Humidity
69% Muggy
UV
7.4 Very High
View Details
May best
Excellent
Temp
29°C / 18°C
Feels Like
31°C / 19°C
Rain
11days (118 mm) Wet
Sun
10.8h Excellent
Humidity
71% Muggy
UV
7.6 Very High
View Details
June
Fair
Temp
31°C / 22°C
Feels Like
36°C / 25°C
Rain
12days (108 mm) Wet
Sun
11.1h Excellent
Humidity
73% Muggy
UV
8.3 Very High
View Details
July
Poor
Temp
33°C / 24°C
Feels Like
38°C / 28°C
Rain
14days (88 mm) Wet
Sun
11.6h Excellent
Humidity
74% Muggy
UV
8.2 Very High
View Details
August
Poor
Temp
33°C / 24°C
Feels Like
37°C / 28°C
Rain
14days (82 mm) Wet
Sun
10.7h Excellent
Humidity
72% Muggy
UV
7.8 Very High
View Details
September best
Excellent
Temp
31°C / 21°C
Feels Like
34°C / 24°C
Rain
7days (72 mm) Good
Sun
10h Excellent
Humidity
67% Muggy
UV
6.7 High
View Details
October best
Excellent
Temp
26°C / 16°C
Feels Like
27°C / 16°C
Rain
5days (69 mm) Good
Sun
8.9h Good
Humidity
66% Muggy
UV
5.5 High
View Details
November
Good
Temp
20°C / 10°C
Feels Like
19°C / 8°C
Rain
7days (79 mm) Good
Sun
7.5h Good
Humidity
71% Muggy
UV
4.1 Moderate
View Details
December
Fair
Temp
16°C / 7°C
Feels Like
14°C / 5°C
Rain
10days (115 mm) Wet
Sun
5.9h Fair
Humidity
77% Humid
UV
3.4 Moderate
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 14°C / 5°C 12°C / 2°C 11days (137 mm) Wet 6.7h Fair 74% Muggy 3.6 Moderate Fair View Details
February 18°C / 8°C 17°C / 6°C 10days (113 mm) Wet 6.7h Fair 75% Muggy 4.6 Moderate Good View Details
March 21°C / 10°C 21°C / 9°C 11days (114 mm) Wet 8.3h Good 72% Muggy 5.8 High Good View Details
April best 24°C / 13°C 25°C / 12°C 8days (109 mm) Wet 9.9h Good 69% Muggy 7.4 Very High Excellent View Details
May best 29°C / 18°C 31°C / 19°C 11days (118 mm) Wet 10.8h Excellent 71% Muggy 7.6 Very High Excellent View Details
June 31°C / 22°C 36°C / 25°C 12days (108 mm) Wet 11.1h Excellent 73% Muggy 8.3 Very High Fair View Details
July 33°C / 24°C 38°C / 28°C 14days (88 mm) Wet 11.6h Excellent 74% Muggy 8.2 Very High Poor View Details
August 33°C / 24°C 37°C / 28°C 14days (82 mm) Wet 10.7h Excellent 72% Muggy 7.8 Very High Poor View Details
September best 31°C / 21°C 34°C / 24°C 7days (72 mm) Good 10h Excellent 67% Muggy 6.7 High Excellent View Details
October best 26°C / 16°C 27°C / 16°C 5days (69 mm) Good 8.9h Good 66% Muggy 5.5 High Excellent View Details
November 20°C / 10°C 19°C / 8°C 7days (79 mm) Good 7.5h Good 71% Muggy 4.1 Moderate Good View Details
December 16°C / 7°C 14°C / 5°C 10days (115 mm) Wet 5.9h Fair 77% Humid 3.4 Moderate Fair View Details

What to Wear

Light, breathable fabrics like cotton and linen are essential. Opt for loose-fitting clothing in light colors to stay cool.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

September is typically excellent for visiting Millbrook, with average highs of 31°C (88°F) and around 7 rainy days. Millbrook, United States in September has hot conditions, with highs reaching 31.2°C (88°F) and afternoons the warmest p
Millbrook typically sees around 7 rainy days in September with 72 mm (2.8 in) of total rainfall. An umbrella should suffice.
Nights stay pleasantly warm in Millbrook during September, around 21°C (71°F). Light evening wear is sufficient.
With highs of 31°C (88°F) and lows of 21°C (71°F) in September, we recommend: Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Millbrook with comfortable temperatures and lower chances of rain.
The average UV index in Millbrook during September is 7 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.
Millbrook gets approximately 12 hours of daylight per day in September, with around 10 hours of sunshine.
Snow is uncommon in Millbrook during September based on 10-year climate averages.

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