8.1 /10
Excellent

September is an excellent month in Olean

Climate Overview

Olean, United States in September has warm conditions, with highs averaging 21.9°C (71°F).

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 23°C (74°F) at the start to 20°C (67°F) by month's end.

September sees fairly even rainfall, totalling about 84 mm across the month.

Expect around 9.4h of sunshine at the start of September, decreasing to 7.1h by the end.

The warmest days tend to fall around the 4th, averaging 23.4°C (74°F).

Compared to August, this month is about 3°C cooler with 4 fewer rainy days. Temperatures begin dropping heading into October.

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Monthly September Averages

Temperature
22°C / 13°C
Feels Like
22°C / 13°C
Rain
9 days · 84 mm
Sunshine
8.8h / day
Humidity
78% — Humid
Wind
14 km/h
Wind Direction
SSW (202°)
Gusts
35 km/h
Daylight
12.5 h
Cloud Cover
56%
Clear Sky Days
4.9
UV Index
5 — Moderate
Dew Point
14°C — Comfortable
Moon Phase
Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

28°C 24°C 20°C 16°C 12°C 8°C 4°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 06:55
Daylight 12.5h
Sunset 19:26

What to Expect

Daytime temperatures around 22°C (71°F) are ideal for full-day outdoor exploration.

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

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

January
Poor
Temp
0°C / -7°C
Feels Like
-4°C / -12°C
Rain
15days (87 mm) Wet
Sun
4.5h Fair
Humidity
78% Humid
UV
1.9 Low
Snow Days
18days
February
Poor
Temp
3°C / -6°C
Feels Like
-2°C / -11°C
Rain
13days (87 mm) Wet
Sun
5.8h Fair
Humidity
75% Muggy
UV
3 Moderate
Snow Days
14days
March
Poor
Temp
7°C / -2°C
Feels Like
4°C / -7°C
Rain
13days (90 mm) Wet
Sun
7.3h Good
Humidity
70% Muggy
UV
4.2 Moderate
Snow Days
11days
April
Poor
Temp
13°C / 3°C
Feels Like
11°C / 0°C
Rain
15days (114 mm) Wet
Sun
8.4h Good
Humidity
70% Muggy
UV
4.8 Moderate
Snow Days
7days
May
Good
Temp
19°C / 10°C
Feels Like
18°C / 8°C
Rain
15days (112 mm) Wet
Sun
9.6h Good
Humidity
75% Muggy
UV
5.8 High
Snow Days
1days
June best
Excellent
Temp
24°C / 14°C
Feels Like
24°C / 14°C
Rain
13days (103 mm) Wet
Sun
11.1h Excellent
Humidity
75% Muggy
UV
6.7 High
July best
Excellent
Temp
26°C / 17°C
Feels Like
28°C / 18°C
Rain
14days (91 mm) Wet
Sun
11.3h Excellent
Humidity
76% Humid
UV
6.9 High
August best
Excellent
Temp
25°C / 17°C
Feels Like
26°C / 17°C
Rain
13days (101 mm) Wet
Sun
10.4h Excellent
Humidity
77% Humid
UV
5.9 High
September best
Excellent
Temp
22°C / 13°C
Feels Like
22°C / 13°C
Rain
9days (84 mm) Wet
Sun
8.8h Good
Humidity
78% Humid
UV
5 Moderate
October
Fair
Temp
16°C / 8°C
Feels Like
14°C / 5°C
Rain
12days (104 mm) Wet
Sun
6.9h Fair
Humidity
78% Humid
UV
3.4 Moderate
Snow Days
1days
November
Poor
Temp
8°C / 1°C
Feels Like
4°C / -3°C
Rain
13days (81 mm) Wet
Sun
5.3h Fair
Humidity
77% Humid
UV
2.2 Moderate
Snow Days
9days
December
Poor
Temp
2°C / -4°C
Feels Like
-2°C / -9°C
Rain
15days (85 mm) Wet
Sun
3.9h Poor
Humidity
79% Humid
UV
1.6 Low
Snow Days
16days
Month Temp Feels Like Rain Sun Humidity UV Status Details
January 0°C / -7°C -4°C / -12°C 15days (87 mm) Wet 4.5h Fair 78% Humid 1.9 Low Poor View Details
February 3°C / -6°C -2°C / -11°C 13days (87 mm) Wet 5.8h Fair 75% Muggy 3 Moderate Poor View Details
March 7°C / -2°C 4°C / -7°C 13days (90 mm) Wet 7.3h Good 70% Muggy 4.2 Moderate Poor View Details
April 13°C / 3°C 11°C / 0°C 15days (114 mm) Wet 8.4h Good 70% Muggy 4.8 Moderate Poor View Details
May 19°C / 10°C 18°C / 8°C 15days (112 mm) Wet 9.6h Good 75% Muggy 5.8 High Good View Details
June best 24°C / 14°C 24°C / 14°C 13days (103 mm) Wet 11.1h Excellent 75% Muggy 6.7 High Excellent View Details
July best 26°C / 17°C 28°C / 18°C 14days (91 mm) Wet 11.3h Excellent 76% Humid 6.9 High Excellent View Details
August best 25°C / 17°C 26°C / 17°C 13days (101 mm) Wet 10.4h Excellent 77% Humid 5.9 High Excellent View Details
September best 22°C / 13°C 22°C / 13°C 9days (84 mm) Wet 8.8h Good 78% Humid 5 Moderate Excellent View Details
October 16°C / 8°C 14°C / 5°C 12days (104 mm) Wet 6.9h Fair 78% Humid 3.4 Moderate Fair View Details
November 8°C / 1°C 4°C / -3°C 13days (81 mm) Wet 5.3h Fair 77% Humid 2.2 Moderate Poor View Details
December 2°C / -4°C -2°C / -9°C 15days (85 mm) Wet 3.9h Poor 79% Humid 1.6 Low Poor View Details

What to Wear

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

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

Packing List

UmbrellaSunscreen (SPF 30+)SunglassesComfortable walking shoes

Frequently Asked Questions

September is typically excellent for visiting Olean, with average highs of 22°C (71°F) and around 9 rainy days. Olean, United States in September has warm conditions, with highs averaging 21.9°C (71°F).
Olean typically sees around 9 rainy days in September with 84 mm (3.3 in) of total rainfall. An umbrella should suffice.
Evenings in Olean during September are mild at 13°C (56°F). A light cardigan is usually enough.
With highs of 22°C (71°F) and lows of 13°C (56°F) in September, we recommend: Umbrella, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Olean with comfortable temperatures and lower chances of rain.
The average UV index in Olean during September is 5 (moderate). Sunscreen and sunglasses are recommended during midday hours.
Olean gets approximately 13 hours of daylight per day in September, with around 9 hours of sunshine.
Snow is uncommon in Olean during September based on 10-year climate averages.

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