San Francisco Weather

2025 (Full Year)

Average Temperature
17.3 °C
High
/
11.1 °C
Low
533.3mm
Rain Volume
31.5°C
Peak Temp
3.9°C
Low Temp
365
Days Count

Seasonal Breakdown

Average temperatures and rainfall by season

Spring

92 days
17.1°C
Avg High
/
10.2°C
Avg Low
Rainfall
105.8mm

Summer

92 days
18.3°C
Avg High
/
12.8°C
Avg Low
Rainfall
1.3mm

Autumn

91 days
19.4°C
Avg High
/
13.3°C
Avg Low
Rainfall
133.9mm

Winter

90 days
14.3°C
Avg High
/
7.9°C
Avg Low
Rainfall
292.3mm

Seasons based on meteorological calendar: Spring (Mar-May), Summer (Jun-Aug), Autumn (Sep-Nov), Winter (Dec-Feb)

✈️ Travel Recommendations

Best visiting months: September, August, October

Based on optimal temperature and rainfall balance from historical weather patterns

Temperature Trends

Daily high, low, and average

Weather Extremes

Most notable conditions during this period

Period High

31.5°C
Tuesday, September 23
avg daily high: 17.3°C

Coolest Day

10.0°C
Sunday, November 30
avg daily high: 17.3°C

Period Low

3.9°C
Monday, January 27
avg night low: 11.1°C
Progress 0%
0 / 0 years
Analyzing Historical Data

Analyzing 15 years of historical data...

Analysis Period

Years: 15
Location: San Francisco
Period: 2025-01-01 to 2025-12-31

Weather Insights

Key findings from analysis for selected period

Variable with Cold Extremes

Worth noting

Average of 17.3°C but 1 cold day (3.9°C low).

📅

Seasonal Weather Patterns

Info
Rainfall Patterns:
Wettest: February (141mm), December (128mm)
Driest: June (0mm), August (0mm)

Temperature Patterns (Monthly Averages):
Hottest months: September (21.3°C), October (20.4°C)
Coolest months: December (13.3°C), February (14.8°C)

Travel Recommendations:
Best visiting months: September, August, October (optimal temperature and rainfall balance).
⚠️

5 Exceptional Weather Events (showing top 3)

Info

The 3 most extreme of 5 notable days in this period:

Sep 23 Heat

Hottest day: 31.5°C

Jan 27 Cold

Coldest night: 3.9°C

Feb 4 Rain

Heavy rain: 31.3mm in one day

1 High Heat Index Day

Info

1 day where humidity amplified heat sensation (38.3°C heat index). 31.5°C temperature felt like 38.3°C due to 68% humidity.

High Humidity Levels

Info

Average humidity of 79% indicates persistently moist air conditions. Heat sensation amplified during warm periods (17.3°C average temperature). Humidity varied significantly (28%-98% range).

📊

Highly Variable Humidity

Info

Large humidity swings (28%-98%) for a year. Conditions ranged from dry to very humid.

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Global Weather Data

Features

  • Historical weather data
  • City comparisons
  • Interactive charts
  • Climate analysis
  • Weather trends

Data Source

Weather data provided by Open-Meteo, offering reliable historical weather information from meteorological stations worldwide.

Data accuracy and availability may vary by location and time period.

© 2025 WeatherWhen. Historical weather data analysis tool.

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