Weather by Month - San Diego
Temperature Comparison
Jan
MILD
Feb
MILD
Mar
MILD
Apr
MILD
May
MILD
Jun
MILD
Jul
WARM
Aug
WARM
Sep
WARM
Oct
WARM
Nov
MILD
Dec
MILD
| Month | Low Temperature | High Temperature | Category |
|---|---|---|---|
| January | | | mild |
| February | | | mild |
| March | | | mild |
| April | | | mild |
| May | | | mild |
| June | | | mild |
| July | | | warm |
| August | | | warm |
| September | | | warm |
| October | | | warm |
| November | | | mild |
| December | | | mild |
Rain & Sunshine Patterns
Driest Months
#1 June
Best for: outdoor activities & sightseeing
#2 July
Best for: outdoor activities & sightseeing
#3 August
Best for: outdoor activities & sightseeing
Wettest Months
#1 February
Expect: possible showers, pack waterproofs
#2 January
Expect: possible showers, pack waterproofs
#3 December
Expect: possible showers, pack waterproofs
UV & Sun Protection Calendar
⚠️ High UV Alert: February, March, April, May, June, July, August, September, October require serious sun protection.
Jan
5
MODERATE
Feb
6
HIGH
Mar
7
HIGH
Apr
8
VERY-HIGH
May
9
VERY-HIGH
Jun
9
VERY-HIGH
Jul
9
VERY-HIGH
Aug
8
VERY-HIGH
Sep
8
HIGH
Oct
7
HIGH
Nov
5
MODERATE
Dec
4
MODERATE
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 10 hours in December (winter) to 14.3 hours in June (summer), which is a difference of 4.3 hours.
Shortest Days
December
10h
Average Sunrise:06:42
Average Sunset:16:45
Plan daytime activities for midday when light is best. Early sunsets mean evening plans should account for darkness.
Longest Days
June
14.3h
Average Sunrise:04:40
Average Sunset:18:56
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:
May (10 km/h)
April (10 km/h)
June (10 km/h)
Packing tip: Conditions are generally calm, but a light layer is always handy.
Humidity Levels
Average humidity
75%
Most humid:
August (78%)
Least humid:
November (72%)
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 17°C
Avg Low 9°C
Avg Rain 63 mm
Mild winter; light layers recommended
Spring
March, April, May
Avg High 19°C
Avg Low 12°C
Avg Rain 29 mm
Variable conditions; layer your clothing
Summer
June, July, August
Avg High 24°C
Avg Low 17°C
Avg Rain 2 mm
Comfortable temperatures; enjoy outdoor activities
Autumn
September, October, November
Avg High 23°C
Avg Low 15°C
Avg Rain 17 mm
Mild conditions; transitional weather
Monthly Details
Click any month for detailed weather information and packing advice.
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View Best Time to VisitFrequently Asked Questions
When is San Diego warmest?
August is typically the warmest month in San Diego, with average high temperatures reaching around 25°C (77°F). This is peak summer weather, ideal for outdoor activities and sightseeing.
When is San Diego coldest?
January is usually the coldest month, with average low temperatures dropping to around 9°C (48°F). Pack warm layers if visiting during this time, especially for evening activities.
When does San Diego get the most rain?
February typically sees the most rainfall in San Diego, averaging around 75mm (3.0 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 San Diego?
June is typically the driest month, with average rainfall of just 2mm (0.1 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 San Diego throughout the year?
Temperatures in San Diego range from average lows of 13°C (56°F) to highs of 21°C (69°F). This variation means you'll want to pack differently depending on when you visit—layers are key for adapting to the seasonal changes.
Do I need sun protection when visiting San Diego?
Yes, sun protection is important in San Diego. UV levels can reach 9 during peak months, which is considered very high. Pack sunscreen (SPF 30+), sunglasses, and a hat, especially if you'll be outdoors for extended periods.