Summit, United States — Weather in September 2026

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

Cfa Humid Subtropical
8.6 /10
Excellent

September is an excellent month in Summit

Climate Overview

Summit, United States in September has warm conditions, with highs averaging 24.4°C (76°F). Rain falls on about 10 days this month.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 26°C (79°F) at the start to 22°C (71°F) by month's end.

September sees fairly even rainfall, totalling about 96 mm across the month.

Expect around 9.8h of sunshine at the start of September, decreasing to 7.1h by the end.

The warmest days tend to fall around the 4th, averaging 26.7°C (80°F).

Compared to August, this month is about 4°C cooler with 2 fewer rainy days. Temperatures begin dropping heading into October.

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Monthly September Averages

Temperature
24°C / 16°C
Feels Like
25°C / 16°C
Rain
10 days · 97 mm
Sunshine
8.7h / day
Humidity
74% — Humid
Wind
15 km/h
Wind Direction
NNE (15°)
Gusts
32 km/h
Daylight
12.5 h
Cloud Cover
57%
Clear Sky Days
4.6
UV Index
5 — Moderate
Dew Point
16°C — Comfortable
Moon Phase
Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

32°C 28°C 24°C 20°C 16°C 12°C 8°C 151015202530
HighLow

Daily Precipitation

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

Daily Sunshine

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

Daily Wind Speed

0 5 10 15 20 25 151015202530
Wind Speed
Sun Position
Sunrise 06:39
Daylight 12.5h
Sunset 19:09

What to Expect

Daytime temperatures around 24°C (76°F) are ideal for full-day outdoor exploration.

Rain usually comes in shorter passing showers rather than all-day rain.

Recent yearly records for September have stayed close to the long-run average.

Compare Months

January
Poor
Temp
4°C / -3°C
Feels Like
0°C / -8°C
Rain
9days (88 mm) Wet
Sun
6h Fair
Humidity
67% Muggy
UV
2.3 Moderate
Snow Days
6days
View Details
February
Poor
Temp
6°C / -2°C
Feels Like
3°C / -6°C
Rain
9days (90 mm) Wet
Sun
6.7h Fair
Humidity
68% Muggy
UV
3.4 Moderate
Snow Days
6days
View Details
March
Poor
Temp
10°C / 1°C
Feels Like
7°C / -3°C
Rain
10days (101 mm) Wet
Sun
8.1h Good
Humidity
66% Muggy
UV
4.6 Moderate
Snow Days
4days
View Details
April
Fair
Temp
16°C / 6°C
Feels Like
14°C / 3°C
Rain
12days (106 mm) Wet
Sun
8.7h Good
Humidity
67% Muggy
UV
5.3 High
Snow Days
1days
View Details
May best
Excellent
Temp
21°C / 12°C
Feels Like
21°C / 10°C
Rain
12days (109 mm) Wet
Sun
9.3h Good
Humidity
73% Muggy
UV
6.2 High
View Details
June best
Excellent
Temp
26°C / 17°C
Feels Like
27°C / 17°C
Rain
11days (85 mm) Wet
Sun
11.2h Excellent
Humidity
70% Muggy
UV
6.9 High
View Details
July best
Good
Temp
30°C / 21°C
Feels Like
32°C / 23°C
Rain
14days (129 mm) Wet
Sun
11.5h Excellent
Humidity
72% Muggy
UV
7.2 Very High
View Details
August best
Excellent
Temp
28°C / 20°C
Feels Like
30°C / 21°C
Rain
12days (102 mm) Wet
Sun
10.3h Excellent
Humidity
73% Muggy
UV
6.6 High
View Details
September best
Excellent
Temp
24°C / 16°C
Feels Like
25°C / 16°C
Rain
10days (97 mm) Wet
Sun
8.7h Good
Humidity
74% Muggy
UV
5 Moderate
View Details
October
Good
Temp
19°C / 11°C
Feels Like
17°C / 9°C
Rain
9days (102 mm) Wet
Sun
7.3h Good
Humidity
73% Muggy
UV
4.1 Moderate
View Details
November
Fair
Temp
12°C / 4°C
Feels Like
8°C / 0°C
Rain
8days (78 mm) Wet
Sun
7h Good
Humidity
69% Muggy
UV
2.9 Moderate
Snow Days
1days
View Details
December
Poor
Temp
6°C / -1°C
Feels Like
2°C / -5°C
Rain
11days (104 mm) Wet
Sun
5.7h Fair
Humidity
72% Muggy
UV
2 Low
Snow Days
4days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 4°C / -3°C 0°C / -8°C 9days (88 mm) Wet 6h Fair 67% Muggy 2.3 Moderate Poor View Details
February 6°C / -2°C 3°C / -6°C 9days (90 mm) Wet 6.7h Fair 68% Muggy 3.4 Moderate Poor View Details
March 10°C / 1°C 7°C / -3°C 10days (101 mm) Wet 8.1h Good 66% Muggy 4.6 Moderate Poor View Details
April 16°C / 6°C 14°C / 3°C 12days (106 mm) Wet 8.7h Good 67% Muggy 5.3 High Fair View Details
May best 21°C / 12°C 21°C / 10°C 12days (109 mm) Wet 9.3h Good 73% Muggy 6.2 High Excellent View Details
June best 26°C / 17°C 27°C / 17°C 11days (85 mm) Wet 11.2h Excellent 70% Muggy 6.9 High Excellent View Details
July best 30°C / 21°C 32°C / 23°C 14days (129 mm) Wet 11.5h Excellent 72% Muggy 7.2 Very High Good View Details
August best 28°C / 20°C 30°C / 21°C 12days (102 mm) Wet 10.3h Excellent 73% Muggy 6.6 High Excellent View Details
September best 24°C / 16°C 25°C / 16°C 10days (97 mm) Wet 8.7h Good 74% Muggy 5 Moderate Excellent View Details
October 19°C / 11°C 17°C / 9°C 9days (102 mm) Wet 7.3h Good 73% Muggy 4.1 Moderate Good View Details
November 12°C / 4°C 8°C / 0°C 8days (78 mm) Wet 7h Good 69% Muggy 2.9 Moderate Fair View Details
December 6°C / -1°C 2°C / -5°C 11days (104 mm) Wet 5.7h Fair 72% Muggy 2 Low Poor View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

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

Packing List

UmbrellaWaterproof jacketBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

September is typically excellent for visiting Summit, with average highs of 24°C (76°F) and around 10 rainy days. Summit, United States in September has warm conditions, with highs averaging 24.4°C (76°F). Rain falls on about 10 days
Summit typically sees around 10 rainy days in September with 97 mm (3.8 in) of total rainfall. An umbrella should suffice.
Evenings in Summit during September are mild at 16°C (61°F). A light cardigan is usually enough.
With highs of 24°C (76°F) and lows of 16°C (61°F) in September, we recommend: Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Summit with comfortable temperatures and lower chances of rain.
The average UV index in Summit during September is 5 (moderate). Sunscreen and sunglasses are recommended during midday hours.
Summit gets approximately 13 hours of daylight per day in September, with around 9 hours of sunshine.
Snow is uncommon in Summit during September based on 10-year climate averages.

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