Knik-Fairview, United States — Weather in September 2026

Climate Overview

Knik-Fairview, United States in September has mild conditions, with highs averaging 13°C (55°F) and noticeably cooler mornings. Rain falls on about 20 days this month, totalling around 140 mm. Sea temperature stays cool at 13.2°C (56°F).

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 15°C (60°F) at the start to 10°C (51°F) by month's end.

September sees fairly even rainfall, totalling about 139 mm across the month.

Expect around 8.0h of sunshine at the start of September, decreasing to 7.2h by the end.

The warmest days tend to fall around the 1th, averaging 15.6°C (60°F).

Compared to August, this month is about 5°C cooler with 1 fewer rainy days. Temperatures begin dropping heading into October.

Monthly September Averages

Temperature

13°C / 5°C

Feels Like

12°C / 3°C

Rain

20 days · 140 mm

Sunshine

6.7h / day

Humidity

85% — Very Humid

Wind

7 km/h

Wind Direction

E (99°)

Gusts

26 km/h

Daylight

12.9 h

Cloud Cover

77%

Clear Sky Days

1.4

UV Index

2.3 — Moderate

Sea Temperature

13°C

Dew Point

7°C — Dry

Moon Phase

Waxing Crescent · 11%

Snow Days

1 days · 1.7 cm

Frost Days

2 days

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

High Low

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 07:25

Daylight 12.9h

Sunset 20:20

What to Expect

Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.

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

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	-8°C / -14°C	-12°C / -18°C	11days (70 mm) Wet	2.2h Poor	82% Humid	0.4 Low	Poor	View Details
February	-4°C / -12°C	-7°C / -16°C	11days (55 mm) Wet	4.5h Fair	80% Humid	1.1 Low	Poor	View Details
March	0°C / -9°C	-3°C / -12°C	10days (45 mm) Wet	7.6h Good	75% Muggy	2.2 Moderate	Poor	View Details
April	6°C / -3°C	3°C / -7°C	9days (40 mm) Wet	10.4h Excellent	75% Muggy	3.5 Moderate	Poor	View Details
May	12°C / 3°C	11°C / 0°C	14days (60 mm) Wet	11.7h Excellent	74% Muggy	4.3 Moderate	Fair	View Details
June best	18°C / 9°C	17°C / 8°C	15days (78 mm) Wet	12.6h Excellent	75% Muggy	4.8 Moderate	Good	View Details
July best	19°C / 12°C	19°C / 12°C	15days (111 mm) Wet	10.9h Excellent	79% Humid	4.2 Moderate	Good	View Details
August best	18°C / 10°C	17°C / 9°C	21days (164 mm) Wet	8.7h Good	83% Humid	3.5 Moderate	Wet	View Details
September	13°C / 5°C	12°C / 3°C	20days (140 mm) Wet	6.7h Fair	85% Humid	2.3 Moderate	Wet	View Details
October	6°C / -1°C	4°C / -4°C	16days (113 mm) Wet	5h Fair	82% Humid	1.3 Low	Poor	View Details
November	-3°C / -9°C	-6°C / -13°C	12days (70 mm) Wet	3h Poor	79% Humid	0.5 Low	Poor	View Details
December	-7°C / -13°C	-11°C / -18°C	13days (77 mm) Wet	1h Poor	82% Humid	0.2 Low	Poor	View Details

What to Wear

Bundle up with a warm coat, scarf, and closed-toe shoes. Thermal layers underneath give flexibility between indoors and outdoors.

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

Packing List

Layered clothingLight jacketUmbrellaWaterproof jacketWaterproof shoes

Frequently Asked Questions

Expand all

Is September a good time to visit Knik-Fairview?

September is typically wet for visiting Knik-Fairview, with average highs of 13°C (55°F) and around 20 rainy days. Knik-Fairview, United States in September has mild conditions, with highs averaging 13°C (55°F) and noticeably cooler mo

Does it rain a lot in Knik-Fairview in September?

Knik-Fairview typically sees around 20 rainy days in September with 140 mm (5.5 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Knik-Fairview in September?

Yes, nights in Knik-Fairview during September are cold, averaging 5°C (41°F). Pack warm layers and a coat for evenings.

What should I pack for Knik-Fairview in September?

With highs of 13°C (55°F) and lows of 5°C (41°F) in September, we recommend: Layered clothing, Light jacket, Umbrella, Waterproof jacket, Waterproof shoes. Comfortable walking shoes are essential.

Is September among the best months weather-wise in Knik-Fairview?

September is not the most favourable month weather-wise in Knik-Fairview. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Knik-Fairview in September?

The average UV index in Knik-Fairview during September is 2 (low). No special sun protection is needed.

How many hours of daylight are there in Knik-Fairview in September?

Knik-Fairview gets approximately 13 hours of daylight per day in September, with around 7 hours of sunshine.

Does it snow in Knik-Fairview in September?

Yes, Knik-Fairview typically sees around 1 snow days in September with roughly 2 cm (1 in) of snowfall.

Last updated: