Autumn weather

Calculations are based on the last 8 years of historical weather data.

Temperatures

Maximum Temperatures

Period	San Francisco	Porto Alegre
Sep 1	23.8°C	22.1°C
Sep 8	22.6°C	24.1°C
Sep 15	21.0°C	23.2°C
Sep 22	22.0°C	24.4°C
Oct 1	22.5°C	22.9°C
Oct 8	20.6°C	24.1°C
Oct 15	21.4°C	24.6°C
Oct 22	20.2°C	26.9°C
Nov 1	19.0°C	25.5°C
Nov 8	16.8°C	27.4°C
Nov 15	17.0°C	27.9°C
Nov 22	16.0°C	28.0°C
Average	25.1°C	20.2°C

Minimum Temperatures

Period	San Francisco	Porto Alegre
Sep 1	15.3°C	13.7°C
Sep 8	14.5°C	15.4°C
Sep 15	14.1°C	14.7°C
Sep 22	14.1°C	15.6°C
Oct 1	14.3°C	14.8°C
Oct 8	13.1°C	15.8°C
Oct 15	13.5°C	16.1°C
Oct 22	12.9°C	16.8°C
Nov 1	11.9°C	16.3°C
Nov 8	10.4°C	17.9°C
Nov 15	10.5°C	17.6°C
Nov 22	9.8°C	18.6°C
Average	16.1°C	12.9°C

Maximum/minimum temperature averages are computed by averaging the max/min temperature of each day for a given period.

Conditions

Sunny Weather

Period	San Francisco	Porto Alegre
Sep 1	11.2 hours/day	5.3 hours/day
Sep 8	11.4 hours/day	4.4 hours/day
Sep 15	8.6 hours/day	4.8 hours/day
Sep 22	9.0 hours/day	5.1 hours/day
Oct 1	8.1 hours/day	4.3 hours/day
Oct 8	7.9 hours/day	4.6 hours/day
Oct 15	7.9 hours/day	4.9 hours/day
Oct 22	8.0 hours/day	6.1 hours/day
Nov 1	7.7 hours/day	5.2 hours/day
Nov 8	6.1 hours/day	6.3 hours/day
Nov 15	6.1 hours/day	7.9 hours/day
Nov 22	5.8 hours/day	6.3 hours/day
Average	5.4 hours/day	8.2 hours/day

Sun hours are computed from the number of hours of direct sunlight. The length of the day can affect these measurements; for example, northern cities have longer days in summer.

Precipitation Levels

Period	San Francisco	Porto Alegre
Sep 1	0.0mm	11.6mm
Sep 8	0.0mm	6.1mm
Sep 15	0.3mm	5.2mm
Sep 22	0.0mm	3.7mm
Oct 1	0.2mm	6.2mm
Oct 8	0.0mm	6.1mm
Oct 15	0.2mm	3.9mm
Oct 22	1.2mm	4.2mm
Nov 1	0.5mm	5.5mm
Nov 8	1.1mm	3.6mm
Nov 15	2.9mm	5.4mm
Nov 22	3.0mm	5.0mm
Average	5.5mm	0.8mm

Average amount of precipitation that falls in a form of a rain, snow, sleet or hail.

Wind Speed

Period	San Francisco	Porto Alegre
Sep 1	15.2km/h	15.9km/h
Sep 8	16.3km/h	17.1km/h
Sep 15	18.1km/h	14.8km/h
Sep 22	15.4km/h	16.3km/h
Oct 1	14.1km/h	17.0km/h
Oct 8	15.0km/h	16.7km/h
Oct 15	14.5km/h	17.0km/h
Oct 22	14.6km/h	17.4km/h
Nov 1	13.9km/h	17.5km/h
Nov 8	13.4km/h	17.3km/h
Nov 15	13.3km/h	17.1km/h
Nov 22	14.3km/h	18.1km/h
Average	16.8km/h	14.8km/h

Humidity

Period	San Francisco	Porto Alegre
Sep 1	70.8%	74.9%
Sep 8	73.6%	76.8%
Sep 15	76.3%	75.3%
Sep 22	71.0%	74.8%
Oct 1	65.9%	74.2%
Oct 8	67.2%	74.7%
Oct 15	65.8%	74.2%
Oct 22	64.7%	70.4%
Nov 1	65.4%	70.9%
Nov 8	67.5%	68.5%
Nov 15	63.6%	64.8%
Nov 22	65.9%	68.1%
Average	72.3%	68.1%

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Astronomy

Sunrise Time

Period	San Francisco	Porto Alegre
Sep 1	6:43	6:36
Sep 8	6:49	6:28
Sep 15	6:54	6:19
Sep 22	7:01	6:09
Oct 1	7:08	5:59
Oct 8	7:15	5:52
Oct 15	7:22	5:51
Oct 22	7:30	5:43
Nov 1	7:15	5:40
Nov 8	6:46	5:38
Nov 15	6:53	5:34
Nov 22	7:02	5:32
Average	5:54	7:06

Sunrise times are output in the local timezone of each place.

Sunset Time

Period	San Francisco	Porto Alegre
Sep 1	19:34	18:11
Sep 8	19:23	18:15
Sep 15	19:13	18:19
Sep 22	19:00	18:23
Oct 1	18:47	18:28
Oct 8	18:37	18:32
Oct 15	18:28	18:44
Oct 22	18:17	18:50
Nov 1	17:44	19:01
Nov 8	17:01	19:10
Nov 15	16:56	19:16
Nov 22	16:52	19:23
Average	18:42	18:18

Sunset times are output in the local timezone of each place.

Useful Day Length

Period	San Francisco	Porto Alegre
Sep 1	12:34 hours	11:11 hours
Sep 8	12:23 hours	11:15 hours
Sep 15	12:13 hours	11:19 hours
Sep 22	11:59 hours	11:23 hours
Oct 1	11:39 hours	11:28 hours
Oct 8	11:22 hours	11:32 hours
Oct 15	11:06 hours	11:44 hours
Oct 22	10:47 hours	11:50 hours
Nov 1	10:29 hours	12:01 hours
Nov 8	10:01 hours	12:10 hours
Nov 15	9:56 hours	12:16 hours
Nov 22	9:50 hours	12:23 hours
Average	11:42 hours	11:12 hours

Discards daylight hours before 7 AM. In places that are located to the west of the timezone, the sun rises and sets later compared to the cities that are located to the east. This means that the useful day length is longer in the cities located to the west of the time zone.

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Autumn weather

Temperatures

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Astronomy

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