San Francisco Weather

2025 (Full Year)

Historical data
Average Temperature
17.3 °C
High
/
11.1 °C
Low
533.3mm
Precipitation
31.5°C
Peak Temp
3.9°C
Low Temp
365
Days Count

Seasonal Breakdown

Average temperatures and precipitation by season

Spring

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

Summer

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

Autumn

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

Winter

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

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

Monthly Breakdown

Average temperatures and precipitation by month

January

31 days
14.9°C / 7.3°C
Avg High / Low
Precipitation
24.2mm

February

28 days
14.8°C / 8.1°C
Avg High / Low
Precipitation
140.6mm

March

31 days
15.3°C / 8.9°C
Avg High / Low
Precipitation
91.7mm

April

30 days
16.9°C / 10.2°C
Avg High / Low
Precipitation
10.0mm

May

31 days
19.0°C / 11.5°C
Avg High / Low
Precipitation
4.1mm

June

30 days
17.7°C / 11.8°C
Avg High / Low
Precipitation
0.0mm

July

31 days
17.2°C / 12.8°C
Avg High / Low
Precipitation
1.0mm

August

31 days
20.1°C / 13.9°C
Avg High / Low
Precipitation
0.3mm

September

30 days
21.3°C / 15.4°C
Avg High / Low
Precipitation
8.3mm

October

31 days
20.4°C / 13.5°C
Avg High / Low
Precipitation
37.8mm

November

30 days
16.5°C / 11.1°C
Avg High / Low
Precipitation
87.8mm

December

31 days
13.3°C / 8.3°C
Avg High / Low
Precipitation
127.5mm

Temperature Trends

Daily high, low, and average

Weather Extremes

Most notable conditions during this period

Period High

31.5°C
Tuesday, September 23

Coolest Day

10.0°C
Sunday, November 30

Period Low

3.9°C
Monday, January 27

Compare with historical weather

Load the same period from the previous 15 years.

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).

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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, May (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).

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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

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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.

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