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Port Costa, CA Weather Forecast | 5 Day
Updated: Sun Jul 13th 2025 9:45 AM PDT
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Partly Cloudy
Sun 7-13
Partly Cloudy with a high of 85°F and a low of 55°F. Wind will be moderate, blowing around 12mph on average and gusts of 13.8mph at 10 PM. The humidity will be on the higher side, averaging about 72%, the maximum being 82% at 11 PM and 44% being its lowest at 3 PM. Barometric pressure is its highest of 29.99inHg at 10 AM, a lowest point of 29.9inHg at 7 PM with an avg 29.94inHg.
- HI: 85°F
- LO: 55°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
11.9 mph - Humidity
72% avg. - UV Index
2.9 - Air QualityModerate
- Sunrise
05:57 AM - Sunset
08:31 PM - Moonrise
10:40 PM - Moonset
08:46 AM - Moon Phase
Waning Gibbous
Partly Cloudy
Mon 7-14
Partly Cloudy with a high of 84°F and a low of 52°F. Wind will be moderate, blowing around 12mph on average and gusts of 14.9mph at 9 PM. The humidity will be on the higher side, averaging about 71%, the maximum being 95% at 4 AM and 39% being its lowest at 2 PM. Barometric pressure is its highest of 29.94inHg at 12 AM, a lowest point of 29.84inHg at 8 PM with an avg 29.9inHg.
- HI: 84°F
- LO: 52°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
11.9 mph - Humidity
71% avg. - UV Index
2.9 - Air QualityModerate
- Sunrise
05:57 AM - Sunset
08:31 PM - Moonrise
11:05 PM - Moonset
09:55 AM - Moon Phase
Waning Gibbous
Overcast
Tue 7-15
Overcast with a high of 73°F and a low of 54°F. Wind will be moderate, blowing around 14mph on average and gusts of 17.5mph at 9 PM. The humidity will be on the higher side, averaging about 77%, the maximum being 95% at 4 AM and 52% being its lowest at 2 PM. Barometric pressure is its highest of 29.9inHg at 11 AM, a lowest point of 29.87inHg at 8 PM with an avg 29.88inHg.
- HI: 73°F
- LO: 54°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
13.4 mph - Humidity
77% avg. - UV Index
2.8 - Air QualityModerate
- Sunrise
05:58 AM - Sunset
08:30 PM - Moonrise
11:30 PM - Moonset
11:03 AM - Moon Phase
Waning Gibbous
Partly Cloudy
Wed 7-16
Partly Cloudy with a high of 77°F and a low of 55°F. Wind will be moderate, blowing around 14mph on average and gusts of 16.8mph at 12 AM. The humidity will be on the higher side, averaging about 69%, the maximum being 90% at 4 AM and 37% being its lowest at 3 PM. Barometric pressure is its highest of 29.92inHg at 11 AM, a lowest point of 29.83inHg at 7 PM with an avg 29.87inHg.
- HI: 77°F
- LO: 55°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
13.4 mph - Humidity
69% avg. - UV Index
2.9 - Air QualityGood
- Sunrise
05:59 AM - Sunset
08:30 PM - Moonrise
11:55 PM - Moonset
12:12 PM - Moon Phase
Waning Gibbous
Sunny
Thu 7-17
Sunny with a high of 79°F and a low of 54°F. Wind will be moderate, blowing around 12mph on average and gusts of 15.5mph at 12 AM. The humidity will be on the higher side, averaging about 61%, the maximum being 86% at 6 AM and 35% being its lowest at 1 PM. Barometric pressure is its highest of 29.91inHg at 11 PM, a lowest point of 29.84inHg at 5 PM with an avg 29.88inHg.
- HI: 79°F
- LO: 54°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
11.9 mph - Humidity
61% avg. - UV Index
0 - Air QualityGood
- Sunrise
05:59 AM - Sunset
08:29 PM - Moonrise
No moonrise - Moonset
01:23 PM - Moon Phase
Last Quarter
Sunny
Fri 7-18
Sunny with a high of 82°F and a low of 53°F. Wind will be moderate, blowing around 11mph on average and gusts of 13.9mph at 8 PM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 87% at 5 AM and 31% being its lowest at 3 PM. Barometric pressure is its highest of 29.95inHg at 11 AM, a lowest point of 29.88inHg at 5 PM with an avg 29.92inHg.
- HI: 82°F
- LO: 53°F
- Rainfall: 0%
- Snowfall: 0%
- Wind
11 mph - Humidity
60% avg. - UV Index
5 - Air QualityTBA
- Sunrise
06:00 AM - Sunset
08:28 PM - Moonrise
12:22 AM - Moonset
02:35 PM - Moon Phase
Last Quarter
Currently
 |
63°F |
29.98 inHg.
Barometer 75%
Humidity WSW 9 mph Wind |
| Cloudy | ||
5 Day Forecast Nearby
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