Monthly Climate Comparison
The biggest temperature swing occurs between October and November, as typical highs shift from 4.5°C / 40.1°F to -3.1°C / 26.4°F (about 7.6°C / 13.7°F).
Jan
COLD
Feb
COLD
Mar
COLD
Apr
COLD
May
COOL
Jun
MILD
Jul
MILD
Aug
MILD
Sep
COOL
Oct
COLD
Nov
COLD
Dec
COLD
| Month | Low Temperature | High Temperature | Category |
|---|---|---|---|
| January | -11.2°C | -6.8°C | COLD |
| February | -8.9°C | -4°C | COLD |
| March | -7.6°C | -1.1°C | COLD |
| April | -2.3°C | 5.1°C | COLD |
| May | 3.1°C | 10.9°C | COOL |
| June | 9°C | 16.1°C | MILD |
| July | 11.7°C | 17.7°C | MILD |
| August | 10.8°C | 16.6°C | MILD |
| September | 6.5°C | 12.1°C | COOL |
| October | -0.3°C | 4.5°C | COLD |
| November | -7.5°C | -3.1°C | COLD |
| December | -10.1°C | -5.5°C | COLD |
July has the warmest typical feels-like highs (17.3°C / 63.1°F), while January is coolest (-10.9°C / 12.4°F).
Jan
COLD
Feb
COLD
Mar
COLD
Apr
COLD
May
COOL
Jun
COOL
Jul
MILD
Aug
MILD
Sep
COOL
Oct
COLD
Nov
COLD
Dec
COLD
| Month | Low Feels Like | High Feels Like | Category |
|---|---|---|---|
| January | -15.7°C | -10.9°C | COLD |
| February | -13.2°C | -7.9°C | COLD |
| March | -11.8°C | -4.8°C | COLD |
| April | -5.9°C | 2.1°C | COLD |
| May | 0.3°C | 8.8°C | COOL |
| June | 7.5°C | 15°C | COOL |
| July | 11.1°C | 17.3°C | MILD |
| August | 9.8°C | 16°C | MILD |
| September | 4.4°C | 10.3°C | COOL |
| October | -3.7°C | 1.7°C | COLD |
| November | -11.7°C | -6.9°C | COLD |
| December | -14.4°C | -9.5°C | COLD |
September is wettest at 136.6 mm / 5.38 inches, while April is driest at 39.8 mm / 1.57 inches.
Jan
MODERATE
Feb
MODERATE
Mar
LIGHT
Apr
LIGHT
May
LIGHT
Jun
LIGHT
Jul
MODERATE
Aug
WET
Sep
WET
Oct
MODERATE
Nov
MODERATE
Dec
MODERATE
| Month | Baseline | Rainfall | Category |
|---|---|---|---|
| January | 1.1 mm | 62.7 mm | MODERATE |
| February | 1.1 mm | 65.3 mm | MODERATE |
| March | 1.1 mm | 47.8 mm | LIGHT |
| April | 1.1 mm | 39.8 mm | LIGHT |
| May | 1.1 mm | 43.3 mm | LIGHT |
| June | 1.1 mm | 54.4 mm | LIGHT |
| July | 1.1 mm | 94.5 mm | MODERATE |
| August | 1.1 mm | 124.5 mm | WET |
| September | 1.1 mm | 136.6 mm | WET |
| October | 1.1 mm | 102.8 mm | MODERATE |
| November | 1.1 mm | 77.9 mm | MODERATE |
| December | 1.1 mm | 88.1 mm | MODERATE |
June has the strongest peak UV (around index 6.1).
Jan
LOW
Feb
LOW-MOD
Mar
MODERATE
Apr
MODERATE
May
MODERATE
Jun
HIGH
Jul
HIGH
Aug
MODERATE
Sep
MODERATE
Oct
LOW-MOD
Nov
LOW-MOD
Dec
LOW
| Month | Baseline | UV Index | Category |
|---|---|---|---|
| January | 0 | 0.8 | LOW |
| February | 0 | 2 | LOW-MOD |
| March | 0 | 3.6 | MODERATE |
| April | 0 | 4.8 | MODERATE |
| May | 0 | 5.8 | MODERATE |
| June | 0 | 6.1 | HIGH |
| July | 0 | 6 | HIGH |
| August | 0 | 5.3 | MODERATE |
| September | 0 | 3.9 | MODERATE |
| October | 0 | 2.3 | LOW-MOD |
| November | 0 | 1 | LOW-MOD |
| December | 0 | 0.4 | LOW |
Daylight ranges from 5.6h in December to 19.2h in June.
Jan
SHORT
Feb
SHORT
Mar
BALANCED
Apr
LONG
May
LONG
Jun
LONG
Jul
LONG
Aug
LONG
Sep
BALANCED
Oct
SHORT
Nov
SHORT
Dec
SHORT
| Month | Baseline | Daylight Hours | Category |
|---|---|---|---|
| January | 0h | 6.5h | SHORT |
| February | 0h | 9h | SHORT |
| March | 0h | 11.9h | BALANCED |
| April | 0h | 14.8h | LONG |
| May | 0h | 17.6h | LONG |
| June | 0h | 19.2h | LONG |
| July | 0h | 18.3h | LONG |
| August | 0h | 15.7h | LONG |
| September | 0h | 12.9h | BALANCED |
| October | 0h | 10h | SHORT |
| November | 0h | 7.2h | SHORT |
| December | 0h | 5.6h | SHORT |
December is most humid (82.7%), while June is driest (72.9%).
Jan
MUGGY
Feb
MUGGY
Mar
MUGGY
Apr
MUGGY
May
HUMID
Jun
HUMID
Jul
MUGGY
Aug
MUGGY
Sep
MUGGY
Oct
MUGGY
Nov
MUGGY
Dec
MUGGY
| Month | Baseline | Humidity (avg) | Category |
|---|---|---|---|
| January | 69.4% | 82.3% | MUGGY |
| February | 69.4% | 81.1% | MUGGY |
| March | 69.4% | 76% | MUGGY |
| April | 69.4% | 75.8% | MUGGY |
| May | 69.4% | 73.5% | HUMID |
| June | 69.4% | 72.9% | HUMID |
| July | 69.4% | 77.8% | MUGGY |
| August | 69.4% | 80.4% | MUGGY |
| September | 69.4% | 81.6% | MUGGY |
| October | 69.4% | 81.4% | MUGGY |
| November | 69.4% | 80.2% | MUGGY |
| December | 69.4% | 82.7% | MUGGY |
December has the strongest typical average wind (7.1 km/h / 4.4 mph), while July is calmest (5.3 km/h / 3.3 mph).
Jan
CALM
Feb
CALM
Mar
CALM
Apr
CALM
May
CALM
Jun
CALM
Jul
CALM
Aug
CALM
Sep
CALM
Oct
CALM
Nov
CALM
Dec
CALM
| Month | Baseline | Wind (avg) | Category |
|---|---|---|---|
| January | 4.6 km/h | 7.1 km/h | CALM |
| February | 4.6 km/h | 6.9 km/h | CALM |
| March | 4.6 km/h | 6.8 km/h | CALM |
| April | 4.6 km/h | 6.1 km/h | CALM |
| May | 4.6 km/h | 5.9 km/h | CALM |
| June | 4.6 km/h | 5.6 km/h | CALM |
| July | 4.6 km/h | 5.3 km/h | CALM |
| August | 4.6 km/h | 5.8 km/h | CALM |
| September | 4.6 km/h | 6.4 km/h | CALM |
| October | 4.6 km/h | 6.5 km/h | CALM |
| November | 4.6 km/h | 6.9 km/h | CALM |
| December | 4.6 km/h | 7.1 km/h | CALM |
December is windiest by P95 gust signal (44.6 km/h / 27.7 mph).
Jan
WINDY
Feb
WINDY
Mar
WINDY
Apr
WINDY
May
WINDY
Jun
WINDY
Jul
BREEZY
Aug
WINDY
Sep
WINDY
Oct
WINDY
Nov
WINDY
Dec
WINDY
| Month | Baseline | Wind (gusts) | Category |
|---|---|---|---|
| January | 0 km/h | 42.1 km/h | WINDY |
| February | 0 km/h | 43.3 km/h | WINDY |
| March | 0 km/h | 40.3 km/h | WINDY |
| April | 0 km/h | 38.2 km/h | WINDY |
| May | 0 km/h | 38.2 km/h | WINDY |
| June | 0 km/h | 35.6 km/h | WINDY |
| July | 0 km/h | 34.9 km/h | BREEZY |
| August | 0 km/h | 38.2 km/h | WINDY |
| September | 0 km/h | 43.6 km/h | WINDY |
| October | 0 km/h | 42.5 km/h | WINDY |
| November | 0 km/h | 43.9 km/h | WINDY |
| December | 0 km/h | 44.6 km/h | WINDY |
September has the most rain days (~19), while April has the fewest (~11.5). Rain days count the average number of days in a month with measurable rain (about 0.1 mm or more).
Jan
FREQUENT
Feb
FREQUENT
Mar
FREQUENT
Apr
FREQUENT
May
FREQUENT
Jun
VERY FREQUENT
Jul
VERY FREQUENT
Aug
VERY FREQUENT
Sep
VERY FREQUENT
Oct
VERY FREQUENT
Nov
VERY FREQUENT
Dec
VERY FREQUENT
| Month | Baseline | Rain Days | Category |
|---|---|---|---|
| January | 8.4 days | 14.4 days | FREQUENT |
| February | 8.4 days | 14.2 days | FREQUENT |
| March | 8.4 days | 12.3 days | FREQUENT |
| April | 8.4 days | 11.5 days | FREQUENT |
| May | 8.4 days | 12.8 days | FREQUENT |
| June | 8.4 days | 15.1 days | VERY FREQUENT |
| July | 8.4 days | 17.5 days | VERY FREQUENT |
| August | 8.4 days | 18.5 days | VERY FREQUENT |
| September | 8.4 days | 19 days | VERY FREQUENT |
| October | 8.4 days | 16.8 days | VERY FREQUENT |
| November | 8.4 days | 15.3 days | VERY FREQUENT |
| December | 8.4 days | 17.2 days | VERY FREQUENT |
August has the most heavy rain/washout risk days (~9). Heavy rain days are the average number of days likely to bring stronger downpours that can disrupt outdoor plans.
Jan
FREQUENT
Feb
FREQUENT
Mar
FREQUENT
Apr
FREQUENT
May
OCCASIONAL
Jun
FREQUENT
Jul
PERSISTENT
Aug
PERSISTENT
Sep
PERSISTENT
Oct
PERSISTENT
Nov
FREQUENT
Dec
PERSISTENT
| Month | Baseline | Heavy Rain Days | Category |
|---|---|---|---|
| January | 0 days | 4 days | FREQUENT |
| February | 0 days | 4 days | FREQUENT |
| March | 0 days | 3 days | FREQUENT |
| April | 0 days | 3 days | FREQUENT |
| May | 0 days | 2 days | OCCASIONAL |
| June | 0 days | 3 days | FREQUENT |
| July | 0 days | 6 days | PERSISTENT |
| August | 0 days | 9 days | PERSISTENT |
| September | 0 days | 9 days | PERSISTENT |
| October | 0 days | 7 days | PERSISTENT |
| November | 0 days | 5 days | FREQUENT |
| December | 0 days | 6 days | PERSISTENT |
January has the highest heat-risk day count (~0 days). Heat days are the average number of days that exceed our location-specific heat-risk threshold.
Jan
LOW
Feb
LOW
Mar
LOW
Apr
LOW
May
LOW
Jun
LOW
Jul
LOW
Aug
LOW
Sep
LOW
Oct
LOW
Nov
LOW
Dec
LOW
| Month | Baseline | Heat Days | Category |
|---|---|---|---|
| January | 0 days | 0 days | LOW |
| February | 0 days | 0 days | LOW |
| March | 0 days | 0 days | LOW |
| April | 0 days | 0 days | LOW |
| May | 0 days | 0 days | LOW |
| June | 0 days | 0 days | LOW |
| July | 0 days | 0 days | LOW |
| August | 0 days | 0 days | LOW |
| September | 0 days | 0 days | LOW |
| October | 0 days | 0 days | LOW |
| November | 0 days | 0 days | LOW |
| December | 0 days | 0 days | LOW |
Rain & Sunshine Patterns
Driest Months
#1 April
Best for: outdoor activities & sightseeing
#2 May
Best for: outdoor activities & sightseeing
#3 March
Best for: outdoor activities & sightseeing
Wettest Months
#1 September
Expect: possible showers, pack waterproofs
#2 August
Expect: possible showers, pack waterproofs
#3 October
Expect: possible showers, pack waterproofs
UV & Sun Protection Calendar
High UV Alert:
June, July require serious sun protection.
Jan
1
LOW
Feb
2
LOW-MOD
Mar
4
MODERATE
Apr
5
MODERATE
May
6
MODERATE
Jun
6
HIGH
Jul
6
HIGH
Aug
5
MODERATE
Sep
4
MODERATE
Oct
2
LOW-MOD
Nov
1
LOW-MOD
Dec
0
LOW
Extreme (11+)
Avoid sun during midday, use SPF 50+
Very High (8-10)
Essential sun protection required
High (6-7)
Use SPF 30+, wear hat & sunglasses
Moderate (3-5)
Sun protection recommended
Low-Moderate (1-2)
Minimal protection needed
Low (0)
No protection required
Daylight Hours
Daylight varies from 5.6 hours in December (winter) to 19.2 hours in June (summer), which is a difference of 13.6 hours.
Shortest Days
December
5.6h
Average Sunrise:10:06
Average Sunset:15:43
Plan daytime activities for midday when light is best. Early sunsets mean evening plans should account for darkness.
Longest Days
June
19.2h
Average Sunrise:03:23
Average Sunset:22:36
Extended daylight perfect for evening activities and late dining. You can fit more sightseeing into each day.
Wind & Humidity Overview
Wind Conditions
Average wind speed
Windiest months:
December (
7 km/h)
January (
7 km/h)
February (
7 km/h)
Packing tip: Conditions are generally calm, but a light layer is always handy.
Humidity Levels
Average humidity
79%
Most humid:
December (
83%)
Least humid:
June (
73%)
Packing tip: Choose breathable, natural fabrics like cotton or linen for comfort in humid conditions.
Seasonal Overview
Northern Hemisphere seasons shape the weather patterns throughout the year. Here's what to expect in each season:
Winter
January, February, December
Avg High
Avg Low
Avg Rain
Cold conditions; pack warm layers and waterproofs
Spring
March, April, May
Avg High
Avg Low
Avg Rain
Variable conditions; layer your clothing
Summer
June, July, August
Avg High
Avg Low
Avg Rain
Comfortable temperatures; enjoy outdoor activities
Autumn
September, October, November
Avg High
Avg Low
Avg Rain
Wet season begins; bring rain gear
Risk Ranking Table
A month-by-month ranking of key weather risks and comforts for this destination, based on historical climate data.
| Ranking Goal | #1 | #2 | #3 | #4 |
|---|---|---|---|---|
| Lowest rain risk | May 2 risk days | Mar 3 risk days | Apr 3 risk days | Jun 3 risk days |
| Lowest heatwave risk | Jan 0 risk days | Feb 0 risk days | Mar 0 risk days | Apr 0 risk days |
| Lowest cold risk | Jul 4 risk days | Aug 10 risk days | Jun 19 risk days | Sep 28 risk days |
| Lowest wind disruption risk | Jul 35 km/h | Jun 36 km/h | Apr 38 km/h | May 38 km/h |
| Most comfortable evenings | Jul 56 / 100 | Jun 51 / 100 | Aug 47 / 100 | May 38 / 100 |
| Best outdoor reliability | May 93 / 100 | Jun 92 / 100 | Apr 87 / 100 | Mar 82 / 100 |
Monthly Details
Click any month for detailed weather information and packing advice.
Looking for the best time to visit?
Get personalized month rankings based on weather comfort, outdoor activity suitability, and seasonal conditions.
Travel planning FAQ
Frequently Asked Questions
Quick answers to the weather questions you ask the most.
When is Anchorage warmest?
July is typically the warmest month in Anchorage, with average high temperatures reaching around 18°C (64°F). This is peak summer weather, ideal for outdoor activities and sightseeing.
When is Anchorage coldest?
January is usually the coldest month, with average low temperatures dropping to around -11°C (12°F). Pack warm layers if visiting during this time, especially for evening activities.
When does Anchorage get the most rain?
September typically sees the most rainfall in Anchorage, averaging around 137mm (5.4 inches). It's wise to pack waterproof layers and have some indoor backup plans if you're visiting during this month.
What is the driest month in Anchorage?
April is typically the driest month, with average rainfall of just 40mm (1.6 inches). This makes it an excellent time for outdoor exploration and activities with minimal risk of rain disruption.
How much does the temperature vary in Anchorage throughout the year?
Temperatures in Anchorage range from average lows of -1°C (31°F) to highs of 5°C (41°F). This variation means you'll want to pack differently depending on when you visit, as layers are key for adapting to the seasonal changes.
Do I need sun protection when visiting Anchorage?
Yes, sun protection is important in Anchorage. UV levels can reach 6 during peak months, which is considered high. Pack sunscreen (SPF 30+), sunglasses, and a hat, especially if you'll be outdoors for extended periods.