Pendleton, United States — Weather in September 2026

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

Csa Hot-Summer Mediterranean
9.6 /10
Excellent

September is an excellent month in Pendleton

Climate Overview

Pendleton, United States in September has warm conditions, with highs averaging 26.7°C (80°F). Temperatures drop noticeably between day and night.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 31°C (88°F) at the start to 24°C (75°F) by month's end.

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

Expect around 11.7h of sunshine at the start of September, decreasing to 10.1h by the end.

The warmest days tend to fall around the 4th, averaging 31.3°C (88°F).

Compared to August, this month is about 6°C cooler with 3 more rainy days. Temperatures begin dropping heading into October.

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Monthly September Averages

Temperature
27°C / 13°C
Feels Like
25°C / 12°C
Rain
4 days · 16 mm
Sunshine
10.8h / day
Humidity
48% — Comfortable
Wind
15 km/h
Wind Direction
SW (225°)
Gusts
33 km/h
Daylight
12.5 h
Cloud Cover
35%
Clear Sky Days
12.6
UV Index
5.3 — High
Dew Point
9°C — Dry
Moon Phase
Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

36°C 31°C 26°C 21°C 16°C 11°C 6°C 151015202530
HighLow

Daily Precipitation

0 mm 1 mm 2 mm 3 mm 4 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 06:35
Daylight 12.6h
Sunset 19:09

What to Expect

Daytime temperatures around 27°C (80°F) are ideal for full-day outdoor exploration.

Rain is uncommon in this month, so most days stay dry from morning through evening.

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

Compare Months

January
Poor
Temp
7°C / -1°C
Feels Like
4°C / -5°C
Rain
13days (61 mm) Wet
Sun
5.5h Fair
Humidity
77% Humid
UV
1.9 Low
Snow Days
7days
View Details
February
Poor
Temp
8°C / -1°C
Feels Like
5°C / -5°C
Rain
14days (64 mm) Wet
Sun
6.8h Fair
Humidity
73% Muggy
UV
2.7 Moderate
Snow Days
11days
View Details
March
Poor
Temp
13°C / 2°C
Feels Like
10°C / -2°C
Rain
12days (56 mm) Wet
Sun
8.9h Good
Humidity
68% Muggy
UV
4.1 Moderate
Snow Days
4days
View Details
April
Fair
Temp
17°C / 5°C
Feels Like
15°C / 2°C
Rain
9days (42 mm) Wet
Sun
10.8h Excellent
Humidity
59% Moderate
UV
5.7 High
Snow Days
2days
View Details
May best
Excellent
Temp
23°C / 10°C
Feels Like
21°C / 7°C
Rain
6days (39 mm) Good
Sun
12.3h Excellent
Humidity
53% Moderate
UV
6.5 High
View Details
June best
Excellent
Temp
28°C / 14°C
Feels Like
26°C / 12°C
Rain
3days (19 mm) Excellent
Sun
13.2h Excellent
Humidity
44% Moderate
UV
7.2 Very High
View Details
July best
Excellent
Temp
33°C / 18°C
Feels Like
32°C / 17°C
Rain
1days (2 mm) Excellent
Sun
13.8h Excellent
Humidity
32% Comfortable
UV
7.5 Very High
View Details
August best
Excellent
Temp
32°C / 18°C
Feels Like
31°C / 17°C
Rain
1days (6 mm) Excellent
Sun
12.4h Excellent
Humidity
37% Comfortable
UV
6.5 High
View Details
September best
Excellent
Temp
27°C / 13°C
Feels Like
25°C / 12°C
Rain
4days (16 mm) Good
Sun
10.8h Excellent
Humidity
48% Moderate
UV
5.3 High
View Details
October
Good
Temp
18°C / 7°C
Feels Like
16°C / 5°C
Rain
8days (46 mm) Wet
Sun
8.5h Good
Humidity
62% Muggy
UV
3.6 Moderate
View Details
November
Poor
Temp
11°C / 3°C
Feels Like
9°C / 0°C
Rain
11days (61 mm) Wet
Sun
6.3h Fair
Humidity
74% Muggy
UV
2 Low
Snow Days
3days
View Details
December
Poor
Temp
7°C / -1°C
Feels Like
3°C / -4°C
Rain
13days (66 mm) Wet
Sun
5h Fair
Humidity
78% Humid
UV
1.5 Low
Snow Days
9days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 7°C / -1°C 4°C / -5°C 13days (61 mm) Wet 5.5h Fair 77% Humid 1.9 Low Poor View Details
February 8°C / -1°C 5°C / -5°C 14days (64 mm) Wet 6.8h Fair 73% Muggy 2.7 Moderate Poor View Details
March 13°C / 2°C 10°C / -2°C 12days (56 mm) Wet 8.9h Good 68% Muggy 4.1 Moderate Poor View Details
April 17°C / 5°C 15°C / 2°C 9days (42 mm) Wet 10.8h Excellent 59% Moderate 5.7 High Fair View Details
May best 23°C / 10°C 21°C / 7°C 6days (39 mm) Good 12.3h Excellent 53% Moderate 6.5 High Excellent View Details
June best 28°C / 14°C 26°C / 12°C 3days (19 mm) Excellent 13.2h Excellent 44% Moderate 7.2 Very High Excellent View Details
July best 33°C / 18°C 32°C / 17°C 1days (2 mm) Excellent 13.8h Excellent 32% Comfortable 7.5 Very High Excellent View Details
August best 32°C / 18°C 31°C / 17°C 1days (6 mm) Excellent 12.4h Excellent 37% Comfortable 6.5 High Excellent View Details
September best 27°C / 13°C 25°C / 12°C 4days (16 mm) Good 10.8h Excellent 48% Moderate 5.3 High Excellent View Details
October 18°C / 7°C 16°C / 5°C 8days (46 mm) Wet 8.5h Good 62% Muggy 3.6 Moderate Good View Details
November 11°C / 3°C 9°C / 0°C 11days (61 mm) Wet 6.3h Fair 74% Muggy 2 Low Poor View Details
December 7°C / -1°C 3°C / -4°C 13days (66 mm) Wet 5h Fair 78% Humid 1.5 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.

Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.

Packing List

Breathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

September is typically excellent for visiting Pendleton, with average highs of 27°C (80°F) and around 4 rainy days. Pendleton, United States in September has warm conditions, with highs averaging 26.7°C (80°F). Temperatures drop noticea
Pendleton typically sees around 4 rainy days in September with 16 mm (0.6 in) of total rainfall. An umbrella should suffice.
Evenings in Pendleton during September are mild at 13°C (56°F). A light cardigan is usually enough.
With highs of 27°C (80°F) and lows of 13°C (56°F) in September, we recommend: Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Comfortable walking shoes. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Pendleton with comfortable temperatures and lower chances of rain.
The average UV index in Pendleton during September is 5 (moderate). Sunscreen and sunglasses are recommended during midday hours.
Pendleton gets approximately 13 hours of daylight per day in September, with around 11 hours of sunshine.
Snow is uncommon in Pendleton during September based on 10-year climate averages.

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