Pullman, United States — Weather in September 2026

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

Csa Hot-Summer Mediterranean
9 /10
Excellent

September is an excellent month in Pullman

Climate Overview

Pullman, United States in September has warm conditions, with highs averaging 24.5°C (76°F). Temperatures drop noticeably between day and night.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 29°C (84°F) at the start to 22°C (72°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 9.4h by the end.

The warmest days tend to fall around the 4th, averaging 29.3°C (85°F).

Compared to August, this month is about 5°C cooler with 2 more rainy days. Temperatures begin dropping heading into October.

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Monthly September Averages

Temperature
25°C / 12°C
Feels Like
22°C / 10°C
Rain
4 days · 20 mm
Sunshine
10.4h / day
Humidity
49% — Comfortable
Wind
16 km/h
Wind Direction
SW (223°)
Gusts
35 km/h
Daylight
12.5 h
Cloud Cover
39%
Clear Sky Days
10.6
UV Index
5.2 — High
Dew Point
7°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 06:28
Daylight 12.6h
Sunset 19:03

What to Expect

Daytime temperatures around 25°C (76°F) are ideal for full-day outdoor exploration.

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

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

Compare Months

January
Poor
Temp
3°C / -4°C
Feels Like
-1°C / -8°C
Rain
13days (70 mm) Wet
Sun
5.2h Fair
Humidity
82% Humid
UV
1.7 Low
Snow Days
9days
View Details
February
Poor
Temp
5°C / -3°C
Feels Like
1°C / -8°C
Rain
13days (74 mm) Wet
Sun
6.3h Fair
Humidity
77% Humid
UV
2.5 Moderate
Snow Days
12days
View Details
March
Poor
Temp
10°C / -1°C
Feels Like
6°C / -5°C
Rain
12days (66 mm) Wet
Sun
8.5h Good
Humidity
71% Muggy
UV
4 Moderate
Snow Days
5days
View Details
April
Fair
Temp
14°C / 3°C
Feels Like
11°C / -1°C
Rain
10days (49 mm) Wet
Sun
10.6h Excellent
Humidity
62% Muggy
UV
5.6 High
Snow Days
2days
View Details
May
Good
Temp
20°C / 8°C
Feels Like
18°C / 5°C
Rain
7days (43 mm) Good
Sun
12.1h Excellent
Humidity
59% Moderate
UV
6.6 High
View Details
June best
Excellent
Temp
24°C / 12°C
Feels Like
23°C / 10°C
Rain
4days (25 mm) Good
Sun
13h Excellent
Humidity
50% Moderate
UV
7.1 Very High
View Details
July best
Excellent
Temp
30°C / 16°C
Feels Like
29°C / 14°C
Rain
1days (4 mm) Excellent
Sun
13.9h Excellent
Humidity
36% Comfortable
UV
7.4 Very High
View Details
August best
Excellent
Temp
30°C / 16°C
Feels Like
28°C / 15°C
Rain
2days (11 mm) Excellent
Sun
12.3h Excellent
Humidity
39% Comfortable
UV
6.5 High
View Details
September best
Excellent
Temp
25°C / 12°C
Feels Like
22°C / 10°C
Rain
4days (20 mm) Good
Sun
10.4h Excellent
Humidity
49% Moderate
UV
5.2 High
View Details
October
Fair
Temp
16°C / 5°C
Feels Like
13°C / 2°C
Rain
9days (61 mm) Wet
Sun
8.3h Good
Humidity
64% Muggy
UV
3.6 Moderate
Snow Days
1days
View Details
November
Poor
Temp
8°C / 1°C
Feels Like
5°C / -3°C
Rain
13days (81 mm) Wet
Sun
5.9h Fair
Humidity
77% Humid
UV
1.9 Low
Snow Days
4days
View Details
December
Poor
Temp
3°C / -3°C
Feels Like
-1°C / -7°C
Rain
15days (92 mm) Wet
Sun
4.5h Fair
Humidity
82% Humid
UV
1.3 Low
Snow Days
12days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 3°C / -4°C -1°C / -8°C 13days (70 mm) Wet 5.2h Fair 82% Humid 1.7 Low Poor View Details
February 5°C / -3°C 1°C / -8°C 13days (74 mm) Wet 6.3h Fair 77% Humid 2.5 Moderate Poor View Details
March 10°C / -1°C 6°C / -5°C 12days (66 mm) Wet 8.5h Good 71% Muggy 4 Moderate Poor View Details
April 14°C / 3°C 11°C / -1°C 10days (49 mm) Wet 10.6h Excellent 62% Muggy 5.6 High Fair View Details
May 20°C / 8°C 18°C / 5°C 7days (43 mm) Good 12.1h Excellent 59% Moderate 6.6 High Good View Details
June best 24°C / 12°C 23°C / 10°C 4days (25 mm) Good 13h Excellent 50% Moderate 7.1 Very High Excellent View Details
July best 30°C / 16°C 29°C / 14°C 1days (4 mm) Excellent 13.9h Excellent 36% Comfortable 7.4 Very High Excellent View Details
August best 30°C / 16°C 28°C / 15°C 2days (11 mm) Excellent 12.3h Excellent 39% Comfortable 6.5 High Excellent View Details
September best 25°C / 12°C 22°C / 10°C 4days (20 mm) Good 10.4h Excellent 49% Moderate 5.2 High Excellent View Details
October 16°C / 5°C 13°C / 2°C 9days (61 mm) Wet 8.3h Good 64% Muggy 3.6 Moderate Fair View Details
November 8°C / 1°C 5°C / -3°C 13days (81 mm) Wet 5.9h Fair 77% Humid 1.9 Low Poor View Details
December 3°C / -3°C -1°C / -7°C 15days (92 mm) Wet 4.5h Fair 82% Humid 1.3 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

Warm evening layerBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

September is typically excellent for visiting Pullman, with average highs of 25°C (76°F) and around 4 rainy days. Pullman, United States in September has warm conditions, with highs averaging 24.5°C (76°F). Temperatures drop noticeabl
Pullman typically sees around 4 rainy days in September with 20 mm (0.8 in) of total rainfall. An umbrella should suffice.
Nights in Pullman during September are cool at around 12°C (53°F). Bring a jacket or sweater for evenings.
With highs of 25°C (76°F) and lows of 12°C (53°F) in September, we recommend: Warm evening layer, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Pullman with comfortable temperatures and lower chances of rain.
The average UV index in Pullman during September is 5 (moderate). Sunscreen and sunglasses are recommended during midday hours.
Pullman gets approximately 13 hours of daylight per day in September, with around 10 hours of sunshine.
Snow is uncommon in Pullman during September based on 10-year climate averages.

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